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android-kvm / linux / 02b2f1a7b8ef340e57cae640a52ec7199b0b887d / . / drivers / gpu / drm / drm_modes.c
blob: 6ba167a3346134072d100af0adbbe9b49e970769 [file] [log] [blame]
/*
* Copyright © 1997-2003 by The XFree86 Project, Inc.
* Copyright © 2007 Dave Airlie
* Copyright © 2007-2008 Intel Corporation
* Jesse Barnes <jesse.barnes@intel.com>
* Copyright 2005-2006 Luc Verhaegen
* Copyright (c) 2001, Andy Ritger aritger@nvidia.com
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of the copyright holder(s)
* and author(s) shall not be used in advertising or otherwise to promote
* the sale, use or other dealings in this Software without prior written
* authorization from the copyright holder(s) and author(s).
*/
#include <linux/ctype.h>
#include <linux/export.h>
#include <linux/fb.h> /* for KHZ2PICOS() */
#include <linux/list.h>
#include <linux/list_sort.h>
#include <linux/of.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
#include <drm/drm_crtc.h>
#include <drm/drm_device.h>
#include <drm/drm_edid.h>
#include <drm/drm_modes.h>
#include <drm/drm_print.h>
#include "drm_crtc_internal.h"
/**
* drm_mode_debug_printmodeline - print a mode to dmesg
* @mode: mode to print
*
* Describe @mode using DRM_DEBUG.
*/
void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
{
DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
}
EXPORT_SYMBOL(drm_mode_debug_printmodeline);
/**
* drm_mode_create - create a new display mode
* @dev: DRM device
*
* Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
* and return it.
*
* Returns:
* Pointer to new mode on success, NULL on error.
*/
struct drm_display_mode *drm_mode_create(struct drm_device *dev)
{
struct drm_display_mode *nmode;
nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
if (!nmode)
return NULL;
return nmode;
}
EXPORT_SYMBOL(drm_mode_create);
/**
* drm_mode_destroy - remove a mode
* @dev: DRM device
* @mode: mode to remove
*
* Release @mode's unique ID, then free it @mode structure itself using kfree.
*/
void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
{
if (!mode)
return;
kfree(mode);
}
EXPORT_SYMBOL(drm_mode_destroy);
/**
* drm_mode_probed_add - add a mode to a connector's probed_mode list
* @connector: connector the new mode
* @mode: mode data
*
* Add @mode to @connector's probed_mode list for later use. This list should
* then in a second step get filtered and all the modes actually supported by
* the hardware moved to the @connector's modes list.
*/
void drm_mode_probed_add(struct drm_connector *connector,
struct drm_display_mode *mode)
{
WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
list_add_tail(&mode->head, &connector->probed_modes);
}
EXPORT_SYMBOL(drm_mode_probed_add);
enum drm_mode_analog {
DRM_MODE_ANALOG_NTSC, /* 525 lines, 60Hz */
DRM_MODE_ANALOG_PAL, /* 625 lines, 50Hz */
};
/*
* The timings come from:
* - https://web.archive.org/web/20220406232708/http://www.kolumbus.fi/pami1/video/pal_ntsc.html
* - https://web.archive.org/web/20220406124914/http://martin.hinner.info/vga/pal.html
* - https://web.archive.org/web/20220609202433/http://www.batsocks.co.uk/readme/video_timing.htm
*/
#define NTSC_LINE_DURATION_NS 63556U
#define NTSC_LINES_NUMBER 525
#define NTSC_HBLK_DURATION_TYP_NS 10900U
#define NTSC_HBLK_DURATION_MIN_NS (NTSC_HBLK_DURATION_TYP_NS - 200)
#define NTSC_HBLK_DURATION_MAX_NS (NTSC_HBLK_DURATION_TYP_NS + 200)
#define NTSC_HACT_DURATION_TYP_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_TYP_NS)
#define NTSC_HACT_DURATION_MIN_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MAX_NS)
#define NTSC_HACT_DURATION_MAX_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MIN_NS)
#define NTSC_HFP_DURATION_TYP_NS 1500
#define NTSC_HFP_DURATION_MIN_NS 1270
#define NTSC_HFP_DURATION_MAX_NS 2220
#define NTSC_HSLEN_DURATION_TYP_NS 4700
#define NTSC_HSLEN_DURATION_MIN_NS (NTSC_HSLEN_DURATION_TYP_NS - 100)
#define NTSC_HSLEN_DURATION_MAX_NS (NTSC_HSLEN_DURATION_TYP_NS + 100)
#define NTSC_HBP_DURATION_TYP_NS 4700
/*
* I couldn't find the actual tolerance for the back porch, so let's
* just reuse the sync length ones.
*/
#define NTSC_HBP_DURATION_MIN_NS (NTSC_HBP_DURATION_TYP_NS - 100)
#define NTSC_HBP_DURATION_MAX_NS (NTSC_HBP_DURATION_TYP_NS + 100)
#define PAL_LINE_DURATION_NS 64000U
#define PAL_LINES_NUMBER 625
#define PAL_HACT_DURATION_TYP_NS 51950U
#define PAL_HACT_DURATION_MIN_NS (PAL_HACT_DURATION_TYP_NS - 100)
#define PAL_HACT_DURATION_MAX_NS (PAL_HACT_DURATION_TYP_NS + 400)
#define PAL_HBLK_DURATION_TYP_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_TYP_NS)
#define PAL_HBLK_DURATION_MIN_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MAX_NS)
#define PAL_HBLK_DURATION_MAX_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MIN_NS)
#define PAL_HFP_DURATION_TYP_NS 1650
#define PAL_HFP_DURATION_MIN_NS (PAL_HFP_DURATION_TYP_NS - 100)
#define PAL_HFP_DURATION_MAX_NS (PAL_HFP_DURATION_TYP_NS + 400)
#define PAL_HSLEN_DURATION_TYP_NS 4700
#define PAL_HSLEN_DURATION_MIN_NS (PAL_HSLEN_DURATION_TYP_NS - 200)
#define PAL_HSLEN_DURATION_MAX_NS (PAL_HSLEN_DURATION_TYP_NS + 200)
#define PAL_HBP_DURATION_TYP_NS 5700
#define PAL_HBP_DURATION_MIN_NS (PAL_HBP_DURATION_TYP_NS - 200)
#define PAL_HBP_DURATION_MAX_NS (PAL_HBP_DURATION_TYP_NS + 200)
struct analog_param_field {
unsigned int even, odd;
};
#define PARAM_FIELD(_odd, _even) \
{ .even = _even, .odd = _odd }
struct analog_param_range {
unsigned int min, typ, max;
};
#define PARAM_RANGE(_min, _typ, _max) \
{ .min = _min, .typ = _typ, .max = _max }
struct analog_parameters {
unsigned int num_lines;
unsigned int line_duration_ns;
struct analog_param_range hact_ns;
struct analog_param_range hfp_ns;
struct analog_param_range hslen_ns;
struct analog_param_range hbp_ns;
struct analog_param_range hblk_ns;
unsigned int bt601_hfp;
struct analog_param_field vfp_lines;
struct analog_param_field vslen_lines;
struct analog_param_field vbp_lines;
};
#define TV_MODE_PARAMETER(_mode, _lines, _line_dur, _hact, _hfp, \
_hslen, _hbp, _hblk, _bt601_hfp, _vfp, \
_vslen, _vbp) \
[_mode] = { \
.num_lines = _lines, \
.line_duration_ns = _line_dur, \
.hact_ns = _hact, \
.hfp_ns = _hfp, \
.hslen_ns = _hslen, \
.hbp_ns = _hbp, \
.hblk_ns = _hblk, \
.bt601_hfp = _bt601_hfp, \
.vfp_lines = _vfp, \
.vslen_lines = _vslen, \
.vbp_lines = _vbp, \
}
static const struct analog_parameters tv_modes_parameters[] = {
TV_MODE_PARAMETER(DRM_MODE_ANALOG_NTSC,
NTSC_LINES_NUMBER,
NTSC_LINE_DURATION_NS,
PARAM_RANGE(NTSC_HACT_DURATION_MIN_NS,
NTSC_HACT_DURATION_TYP_NS,
NTSC_HACT_DURATION_MAX_NS),
PARAM_RANGE(NTSC_HFP_DURATION_MIN_NS,
NTSC_HFP_DURATION_TYP_NS,
NTSC_HFP_DURATION_MAX_NS),
PARAM_RANGE(NTSC_HSLEN_DURATION_MIN_NS,
NTSC_HSLEN_DURATION_TYP_NS,
NTSC_HSLEN_DURATION_MAX_NS),
PARAM_RANGE(NTSC_HBP_DURATION_MIN_NS,
NTSC_HBP_DURATION_TYP_NS,
NTSC_HBP_DURATION_MAX_NS),
PARAM_RANGE(NTSC_HBLK_DURATION_MIN_NS,
NTSC_HBLK_DURATION_TYP_NS,
NTSC_HBLK_DURATION_MAX_NS),
16,
PARAM_FIELD(3, 3),
PARAM_FIELD(3, 3),
PARAM_FIELD(16, 17)),
TV_MODE_PARAMETER(DRM_MODE_ANALOG_PAL,
PAL_LINES_NUMBER,
PAL_LINE_DURATION_NS,
PARAM_RANGE(PAL_HACT_DURATION_MIN_NS,
PAL_HACT_DURATION_TYP_NS,
PAL_HACT_DURATION_MAX_NS),
PARAM_RANGE(PAL_HFP_DURATION_MIN_NS,
PAL_HFP_DURATION_TYP_NS,
PAL_HFP_DURATION_MAX_NS),
PARAM_RANGE(PAL_HSLEN_DURATION_MIN_NS,
PAL_HSLEN_DURATION_TYP_NS,
PAL_HSLEN_DURATION_MAX_NS),
PARAM_RANGE(PAL_HBP_DURATION_MIN_NS,
PAL_HBP_DURATION_TYP_NS,
PAL_HBP_DURATION_MAX_NS),
PARAM_RANGE(PAL_HBLK_DURATION_MIN_NS,
PAL_HBLK_DURATION_TYP_NS,
PAL_HBLK_DURATION_MAX_NS),
12,
/*
* The front porch is actually 6 short sync
* pulses for the even field, and 5 for the
* odd field. Each sync takes half a life so
* the odd field front porch is shorter by
* half a line.
*
* In progressive, we're supposed to use 6
* pulses, so we're fine there
*/
PARAM_FIELD(3, 2),
/*
* The vsync length is 5 long sync pulses,
* each field taking half a line. We're
* shorter for both fields by half a line.
*
* In progressive, we're supposed to use 5
* pulses, so we're off by half
* a line.
*
* In interlace, we're now off by half a line
* for the even field and one line for the odd
* field.
*/
PARAM_FIELD(3, 3),
/*
* The back porch starts with post-equalizing
* pulses, consisting in 5 short sync pulses
* for the even field, 4 for the odd field. In
* progressive, it's 5 short syncs.
*
* In progressive, we thus have 2.5 lines,
* plus the 0.5 line we were missing
* previously, so we should use 3 lines.
*
* In interlace, the even field is in the
* exact same case than progressive. For the
* odd field, we should be using 2 lines but
* we're one line short, so we'll make up for
* it here by using 3.
*
* The entire blanking area is supposed to
* take 25 lines, so we also need to account
* for the rest of the blanking area that
* can't be in either the front porch or sync
* period.
*/
PARAM_FIELD(19, 20)),
};
static int fill_analog_mode(struct drm_device *dev,
struct drm_display_mode *mode,
const struct analog_parameters *params,
unsigned long pixel_clock_hz,
unsigned int hactive,
unsigned int vactive,
bool interlace)
{
unsigned long pixel_duration_ns = NSEC_PER_SEC / pixel_clock_hz;
unsigned int htotal, vtotal;
unsigned int max_hact, hact_duration_ns;
unsigned int hblk, hblk_duration_ns;
unsigned int hfp, hfp_duration_ns;
unsigned int hslen, hslen_duration_ns;
unsigned int hbp, hbp_duration_ns;
unsigned int porches, porches_duration_ns;
unsigned int vfp, vfp_min;
unsigned int vbp, vbp_min;
unsigned int vslen;
bool bt601 = false;
int porches_rem;
u64 result;
drm_dbg_kms(dev,
"Generating a %ux%u%c, %u-line mode with a %lu kHz clock\n",
hactive, vactive,
interlace ? 'i' : 'p',
params->num_lines,
pixel_clock_hz / 1000);
max_hact = params->hact_ns.max / pixel_duration_ns;
if (pixel_clock_hz == 13500000 && hactive > max_hact && hactive <= 720) {
drm_dbg_kms(dev, "Trying to generate a BT.601 mode. Disabling checks.\n");
bt601 = true;
}
/*
* Our pixel duration is going to be round down by the division,
* so rounding up is probably going to introduce even more
* deviation.
*/
result = (u64)params->line_duration_ns * pixel_clock_hz;
do_div(result, NSEC_PER_SEC);
htotal = result;
drm_dbg_kms(dev, "Total Horizontal Number of Pixels: %u\n", htotal);
hact_duration_ns = hactive * pixel_duration_ns;
if (!bt601 &&
(hact_duration_ns < params->hact_ns.min ||
hact_duration_ns > params->hact_ns.max)) {
drm_err(dev, "Invalid horizontal active area duration: %uns (min: %u, max %u)\n",
hact_duration_ns, params->hact_ns.min, params->hact_ns.max);
return -EINVAL;
}
hblk = htotal - hactive;
drm_dbg_kms(dev, "Horizontal Blanking Period: %u\n", hblk);
hblk_duration_ns = hblk * pixel_duration_ns;
if (!bt601 &&
(hblk_duration_ns < params->hblk_ns.min ||
hblk_duration_ns > params->hblk_ns.max)) {
drm_err(dev, "Invalid horizontal blanking duration: %uns (min: %u, max %u)\n",
hblk_duration_ns, params->hblk_ns.min, params->hblk_ns.max);
return -EINVAL;
}
hslen = DIV_ROUND_UP(params->hslen_ns.typ, pixel_duration_ns);
drm_dbg_kms(dev, "Horizontal Sync Period: %u\n", hslen);
hslen_duration_ns = hslen * pixel_duration_ns;
if (!bt601 &&
(hslen_duration_ns < params->hslen_ns.min ||
hslen_duration_ns > params->hslen_ns.max)) {
drm_err(dev, "Invalid horizontal sync duration: %uns (min: %u, max %u)\n",
hslen_duration_ns, params->hslen_ns.min, params->hslen_ns.max);
return -EINVAL;
}
porches = hblk - hslen;
drm_dbg_kms(dev, "Remaining horizontal pixels for both porches: %u\n", porches);
porches_duration_ns = porches * pixel_duration_ns;
if (!bt601 &&
(porches_duration_ns > (params->hfp_ns.max + params->hbp_ns.max) ||
porches_duration_ns < (params->hfp_ns.min + params->hbp_ns.min))) {
drm_err(dev, "Invalid horizontal porches duration: %uns\n",
porches_duration_ns);
return -EINVAL;
}
if (bt601) {
hfp = params->bt601_hfp;
} else {
unsigned int hfp_min = DIV_ROUND_UP(params->hfp_ns.min,
pixel_duration_ns);
unsigned int hbp_min = DIV_ROUND_UP(params->hbp_ns.min,
pixel_duration_ns);
int porches_rem = porches - hfp_min - hbp_min;
hfp = hfp_min + DIV_ROUND_UP(porches_rem, 2);
}
drm_dbg_kms(dev, "Horizontal Front Porch: %u\n", hfp);
hfp_duration_ns = hfp * pixel_duration_ns;
if (!bt601 &&
(hfp_duration_ns < params->hfp_ns.min ||
hfp_duration_ns > params->hfp_ns.max)) {
drm_err(dev, "Invalid horizontal front porch duration: %uns (min: %u, max %u)\n",
hfp_duration_ns, params->hfp_ns.min, params->hfp_ns.max);
return -EINVAL;
}
hbp = porches - hfp;
drm_dbg_kms(dev, "Horizontal Back Porch: %u\n", hbp);
hbp_duration_ns = hbp * pixel_duration_ns;
if (!bt601 &&
(hbp_duration_ns < params->hbp_ns.min ||
hbp_duration_ns > params->hbp_ns.max)) {
drm_err(dev, "Invalid horizontal back porch duration: %uns (min: %u, max %u)\n",
hbp_duration_ns, params->hbp_ns.min, params->hbp_ns.max);
return -EINVAL;
}
if (htotal != (hactive + hfp + hslen + hbp))
return -EINVAL;
mode->clock = pixel_clock_hz / 1000;
mode->hdisplay = hactive;
mode->hsync_start = mode->hdisplay + hfp;
mode->hsync_end = mode->hsync_start + hslen;
mode->htotal = mode->hsync_end + hbp;
if (interlace) {
vfp_min = params->vfp_lines.even + params->vfp_lines.odd;
vbp_min = params->vbp_lines.even + params->vbp_lines.odd;
vslen = params->vslen_lines.even + params->vslen_lines.odd;
} else {
/*
* By convention, NTSC (aka 525/60) systems start with
* the even field, but PAL (aka 625/50) systems start
* with the odd one.
*
* PAL systems also have asymmetric timings between the
* even and odd field, while NTSC is symmetric.
*
* Moreover, if we want to create a progressive mode for
* PAL, we need to use the odd field timings.
*
* Since odd == even for NTSC, we can just use the odd
* one all the time to simplify the code a bit.
*/
vfp_min = params->vfp_lines.odd;
vbp_min = params->vbp_lines.odd;
vslen = params->vslen_lines.odd;
}
drm_dbg_kms(dev, "Vertical Sync Period: %u\n", vslen);
porches = params->num_lines - vactive - vslen;
drm_dbg_kms(dev, "Remaining vertical pixels for both porches: %u\n", porches);
porches_rem = porches - vfp_min - vbp_min;
vfp = vfp_min + (porches_rem / 2);
drm_dbg_kms(dev, "Vertical Front Porch: %u\n", vfp);
vbp = porches - vfp;
drm_dbg_kms(dev, "Vertical Back Porch: %u\n", vbp);
vtotal = vactive + vfp + vslen + vbp;
if (params->num_lines != vtotal) {
drm_err(dev, "Invalid vertical total: %upx (expected %upx)\n",
vtotal, params->num_lines);
return -EINVAL;
}
mode->vdisplay = vactive;
mode->vsync_start = mode->vdisplay + vfp;
mode->vsync_end = mode->vsync_start + vslen;
mode->vtotal = mode->vsync_end + vbp;
if (mode->vtotal != params->num_lines)
return -EINVAL;
mode->type = DRM_MODE_TYPE_DRIVER;
mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
if (interlace)
mode->flags |= DRM_MODE_FLAG_INTERLACE;
drm_mode_set_name(mode);
drm_dbg_kms(dev, "Generated mode " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
return 0;
}
/**
* drm_analog_tv_mode - create a display mode for an analog TV
* @dev: drm device
* @tv_mode: TV Mode standard to create a mode for. See DRM_MODE_TV_MODE_*.
* @pixel_clock_hz: Pixel Clock Frequency, in Hertz
* @hdisplay: hdisplay size
* @vdisplay: vdisplay size
* @interlace: whether to compute an interlaced mode
*
* This function creates a struct drm_display_mode instance suited for
* an analog TV output, for one of the usual analog TV modes. Where
* this is DRM_MODE_TV_MODE_MONOCHROME, a 625-line mode will be created.
*
* Note that @hdisplay is larger than the usual constraints for the PAL
* and NTSC timings, and we'll choose to ignore most timings constraints
* to reach those resolutions.
*
* Returns:
* A pointer to the mode, allocated with drm_mode_create(). Returns NULL
* on error.
*/
struct drm_display_mode *drm_analog_tv_mode(struct drm_device *dev,
enum drm_connector_tv_mode tv_mode,
unsigned long pixel_clock_hz,
unsigned int hdisplay,
unsigned int vdisplay,
bool interlace)
{
struct drm_display_mode *mode;
enum drm_mode_analog analog;
int ret;
switch (tv_mode) {
case DRM_MODE_TV_MODE_NTSC:
fallthrough;
case DRM_MODE_TV_MODE_NTSC_443:
fallthrough;
case DRM_MODE_TV_MODE_NTSC_J:
fallthrough;
case DRM_MODE_TV_MODE_PAL_M:
analog = DRM_MODE_ANALOG_NTSC;
break;
case DRM_MODE_TV_MODE_PAL:
fallthrough;
case DRM_MODE_TV_MODE_PAL_N:
fallthrough;
case DRM_MODE_TV_MODE_SECAM:
fallthrough;
case DRM_MODE_TV_MODE_MONOCHROME:
analog = DRM_MODE_ANALOG_PAL;
break;
default:
return NULL;
}
mode = drm_mode_create(dev);
if (!mode)
return NULL;
ret = fill_analog_mode(dev, mode,
&tv_modes_parameters[analog],
pixel_clock_hz, hdisplay, vdisplay, interlace);
if (ret)
goto err_free_mode;
return mode;
err_free_mode:
drm_mode_destroy(dev, mode);
return NULL;
}
EXPORT_SYMBOL(drm_analog_tv_mode);
/**
* drm_cvt_mode -create a modeline based on the CVT algorithm
* @dev: drm device
* @hdisplay: hdisplay size
* @vdisplay: vdisplay size
* @vrefresh: vrefresh rate
* @reduced: whether to use reduced blanking
* @interlaced: whether to compute an interlaced mode
* @margins: whether to add margins (borders)
*
* This function is called to generate the modeline based on CVT algorithm
* according to the hdisplay, vdisplay, vrefresh.
* It is based from the VESA(TM) Coordinated Video Timing Generator by
* Graham Loveridge April 9, 2003 available at
* http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
*
* And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
* What I have done is to translate it by using integer calculation.
*
* Returns:
* The modeline based on the CVT algorithm stored in a drm_display_mode object.
* The display mode object is allocated with drm_mode_create(). Returns NULL
* when no mode could be allocated.
*/
struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
int vdisplay, int vrefresh,
bool reduced, bool interlaced, bool margins)
{
#define HV_FACTOR 1000
/* 1) top/bottom margin size (% of height) - default: 1.8, */
#define CVT_MARGIN_PERCENTAGE 18
/* 2) character cell horizontal granularity (pixels) - default 8 */
#define CVT_H_GRANULARITY 8
/* 3) Minimum vertical porch (lines) - default 3 */
#define CVT_MIN_V_PORCH 3
/* 4) Minimum number of vertical back porch lines - default 6 */
#define CVT_MIN_V_BPORCH 6
/* Pixel Clock step (kHz) */
#define CVT_CLOCK_STEP 250
struct drm_display_mode *drm_mode;
unsigned int vfieldrate, hperiod;
int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
int interlace;
u64 tmp;
if (!hdisplay || !vdisplay)
return NULL;
/* allocate the drm_display_mode structure. If failure, we will
* return directly
*/
drm_mode = drm_mode_create(dev);
if (!drm_mode)
return NULL;
/* the CVT default refresh rate is 60Hz */
if (!vrefresh)
vrefresh = 60;
/* the required field fresh rate */
if (interlaced)
vfieldrate = vrefresh * 2;
else
vfieldrate = vrefresh;
/* horizontal pixels */
hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
/* determine the left&right borders */
hmargin = 0;
if (margins) {
hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
hmargin -= hmargin % CVT_H_GRANULARITY;
}
/* find the total active pixels */
drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
/* find the number of lines per field */
if (interlaced)
vdisplay_rnd = vdisplay / 2;
else
vdisplay_rnd = vdisplay;
/* find the top & bottom borders */
vmargin = 0;
if (margins)
vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
drm_mode->vdisplay = vdisplay + 2 * vmargin;
/* Interlaced */
if (interlaced)
interlace = 1;
else
interlace = 0;
/* Determine VSync Width from aspect ratio */
if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
vsync = 4;
else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
vsync = 5;
else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
vsync = 6;
else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
vsync = 7;
else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
vsync = 7;
else /* custom */
vsync = 10;
if (!reduced) {
/* simplify the GTF calculation */
/* 4) Minimum time of vertical sync + back porch interval (µs)
* default 550.0
*/
int tmp1, tmp2;
#define CVT_MIN_VSYNC_BP 550
/* 3) Nominal HSync width (% of line period) - default 8 */
#define CVT_HSYNC_PERCENTAGE 8
unsigned int hblank_percentage;
int vsyncandback_porch, __maybe_unused vback_porch, hblank;
/* estimated the horizontal period */
tmp1 = HV_FACTOR * 1000000 -
CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
interlace;
hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
/* 9. Find number of lines in sync + backporch */
if (tmp1 < (vsync + CVT_MIN_V_PORCH))
vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
else
vsyncandback_porch = tmp1;
/* 10. Find number of lines in back porch */
vback_porch = vsyncandback_porch - vsync;
drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
vsyncandback_porch + CVT_MIN_V_PORCH;
/* 5) Definition of Horizontal blanking time limitation */
/* Gradient (%/kHz) - default 600 */
#define CVT_M_FACTOR 600
/* Offset (%) - default 40 */
#define CVT_C_FACTOR 40
/* Blanking time scaling factor - default 128 */
#define CVT_K_FACTOR 128
/* Scaling factor weighting - default 20 */
#define CVT_J_FACTOR 20
#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
CVT_J_FACTOR)
/* 12. Find ideal blanking duty cycle from formula */
hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
hperiod / 1000;
/* 13. Blanking time */
if (hblank_percentage < 20 * HV_FACTOR)
hblank_percentage = 20 * HV_FACTOR;
hblank = drm_mode->hdisplay * hblank_percentage /
(100 * HV_FACTOR - hblank_percentage);
hblank -= hblank % (2 * CVT_H_GRANULARITY);
/* 14. find the total pixels per line */
drm_mode->htotal = drm_mode->hdisplay + hblank;
drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
drm_mode->hsync_start = drm_mode->hsync_end -
(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
drm_mode->hsync_start += CVT_H_GRANULARITY -
drm_mode->hsync_start % CVT_H_GRANULARITY;
/* fill the Vsync values */
drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
drm_mode->vsync_end = drm_mode->vsync_start + vsync;
} else {
/* Reduced blanking */
/* Minimum vertical blanking interval time (µs)- default 460 */
#define CVT_RB_MIN_VBLANK 460
/* Fixed number of clocks for horizontal sync */
#define CVT_RB_H_SYNC 32
/* Fixed number of clocks for horizontal blanking */
#define CVT_RB_H_BLANK 160
/* Fixed number of lines for vertical front porch - default 3*/
#define CVT_RB_VFPORCH 3
int vbilines;
int tmp1, tmp2;
/* 8. Estimate Horizontal period. */
tmp1 = HV_FACTOR * 1000000 -
CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
tmp2 = vdisplay_rnd + 2 * vmargin;
hperiod = tmp1 / (tmp2 * vfieldrate);
/* 9. Find number of lines in vertical blanking */
vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
/* 10. Check if vertical blanking is sufficient */
if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
/* 11. Find total number of lines in vertical field */
drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
/* 12. Find total number of pixels in a line */
drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
/* Fill in HSync values */
drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
/* Fill in VSync values */
drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
drm_mode->vsync_end = drm_mode->vsync_start + vsync;
}
/* 15/13. Find pixel clock frequency (kHz for xf86) */
tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
tmp *= HV_FACTOR * 1000;
do_div(tmp, hperiod);
tmp -= drm_mode->clock % CVT_CLOCK_STEP;
drm_mode->clock = tmp;
/* 18/16. Find actual vertical frame frequency */
/* ignore - just set the mode flag for interlaced */
if (interlaced) {
drm_mode->vtotal *= 2;
drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
}
/* Fill the mode line name */
drm_mode_set_name(drm_mode);
if (reduced)
drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
DRM_MODE_FLAG_NVSYNC);
else
drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
DRM_MODE_FLAG_NHSYNC);
return drm_mode;
}
EXPORT_SYMBOL(drm_cvt_mode);
/**
* drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
* @dev: drm device
* @hdisplay: hdisplay size
* @vdisplay: vdisplay size
* @vrefresh: vrefresh rate.
* @interlaced: whether to compute an interlaced mode
* @margins: desired margin (borders) size
* @GTF_M: extended GTF formula parameters
* @GTF_2C: extended GTF formula parameters
* @GTF_K: extended GTF formula parameters
* @GTF_2J: extended GTF formula parameters
*
* GTF feature blocks specify C and J in multiples of 0.5, so we pass them
* in here multiplied by two. For a C of 40, pass in 80.
*
* Returns:
* The modeline based on the full GTF algorithm stored in a drm_display_mode object.
* The display mode object is allocated with drm_mode_create(). Returns NULL
* when no mode could be allocated.
*/
struct drm_display_mode *
drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
int vrefresh, bool interlaced, int margins,
int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
{ /* 1) top/bottom margin size (% of height) - default: 1.8, */
#define GTF_MARGIN_PERCENTAGE 18
/* 2) character cell horizontal granularity (pixels) - default 8 */
#define GTF_CELL_GRAN 8
/* 3) Minimum vertical porch (lines) - default 3 */
#define GTF_MIN_V_PORCH 1
/* width of vsync in lines */
#define V_SYNC_RQD 3
/* width of hsync as % of total line */
#define H_SYNC_PERCENT 8
/* min time of vsync + back porch (microsec) */
#define MIN_VSYNC_PLUS_BP 550
/* C' and M' are part of the Blanking Duty Cycle computation */
#define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
#define GTF_M_PRIME (GTF_K * GTF_M / 256)
struct drm_display_mode *drm_mode;
unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
int top_margin, bottom_margin;
int interlace;
unsigned int hfreq_est;
int vsync_plus_bp, __maybe_unused vback_porch;
unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
unsigned int __maybe_unused hperiod;
unsigned int vfield_rate, __maybe_unused vframe_rate;
int left_margin, right_margin;
unsigned int total_active_pixels, ideal_duty_cycle;
unsigned int hblank, total_pixels, pixel_freq;
int hsync, hfront_porch, vodd_front_porch_lines;
unsigned int tmp1, tmp2;
if (!hdisplay || !vdisplay)
return NULL;
drm_mode = drm_mode_create(dev);
if (!drm_mode)
return NULL;
/* 1. In order to give correct results, the number of horizontal
* pixels requested is first processed to ensure that it is divisible
* by the character size, by rounding it to the nearest character
* cell boundary:
*/
hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
/* 2. If interlace is requested, the number of vertical lines assumed
* by the calculation must be halved, as the computation calculates
* the number of vertical lines per field.
*/
if (interlaced)
vdisplay_rnd = vdisplay / 2;
else
vdisplay_rnd = vdisplay;
/* 3. Find the frame rate required: */
if (interlaced)
vfieldrate_rqd = vrefresh * 2;
else
vfieldrate_rqd = vrefresh;
/* 4. Find number of lines in Top margin: */
top_margin = 0;
if (margins)
top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
1000;
/* 5. Find number of lines in bottom margin: */
bottom_margin = top_margin;
/* 6. If interlace is required, then set variable interlace: */
if (interlaced)
interlace = 1;
else
interlace = 0;
/* 7. Estimate the Horizontal frequency */
{
tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
2 + interlace;
hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
}
/* 8. Find the number of lines in V sync + back porch */
/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
/* 9. Find the number of lines in V back porch alone: */
vback_porch = vsync_plus_bp - V_SYNC_RQD;
/* 10. Find the total number of lines in Vertical field period: */
vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
vsync_plus_bp + GTF_MIN_V_PORCH;
/* 11. Estimate the Vertical field frequency: */
vfieldrate_est = hfreq_est / vtotal_lines;
/* 12. Find the actual horizontal period: */
hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
/* 13. Find the actual Vertical field frequency: */
vfield_rate = hfreq_est / vtotal_lines;
/* 14. Find the Vertical frame frequency: */
if (interlaced)
vframe_rate = vfield_rate / 2;
else
vframe_rate = vfield_rate;
/* 15. Find number of pixels in left margin: */
if (margins)
left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
1000;
else
left_margin = 0;
/* 16.Find number of pixels in right margin: */
right_margin = left_margin;
/* 17.Find total number of active pixels in image and left and right */
total_active_pixels = hdisplay_rnd + left_margin + right_margin;
/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
ideal_duty_cycle = GTF_C_PRIME * 1000 -
(GTF_M_PRIME * 1000000 / hfreq_est);
/* 19.Find the number of pixels in the blanking time to the nearest
* double character cell: */
hblank = total_active_pixels * ideal_duty_cycle /
(100000 - ideal_duty_cycle);
hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
hblank = hblank * 2 * GTF_CELL_GRAN;
/* 20.Find total number of pixels: */
total_pixels = total_active_pixels + hblank;
/* 21.Find pixel clock frequency: */
pixel_freq = total_pixels * hfreq_est / 1000;
/* Stage 1 computations are now complete; I should really pass
* the results to another function and do the Stage 2 computations,
* but I only need a few more values so I'll just append the
* computations here for now */
/* 17. Find the number of pixels in the horizontal sync period: */
hsync = H_SYNC_PERCENT * total_pixels / 100;
hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
hsync = hsync * GTF_CELL_GRAN;
/* 18. Find the number of pixels in horizontal front porch period */
hfront_porch = hblank / 2 - hsync;
/* 36. Find the number of lines in the odd front porch period: */
vodd_front_porch_lines = GTF_MIN_V_PORCH ;
/* finally, pack the results in the mode struct */
drm_mode->hdisplay = hdisplay_rnd;
drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
drm_mode->hsync_end = drm_mode->hsync_start + hsync;
drm_mode->htotal = total_pixels;
drm_mode->vdisplay = vdisplay_rnd;
drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
drm_mode->vtotal = vtotal_lines;
drm_mode->clock = pixel_freq;
if (interlaced) {
drm_mode->vtotal *= 2;
drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
}
drm_mode_set_name(drm_mode);
if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
else
drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
return drm_mode;
}
EXPORT_SYMBOL(drm_gtf_mode_complex);
/**
* drm_gtf_mode - create the modeline based on the GTF algorithm
* @dev: drm device
* @hdisplay: hdisplay size
* @vdisplay: vdisplay size
* @vrefresh: vrefresh rate.
* @interlaced: whether to compute an interlaced mode
* @margins: desired margin (borders) size
*
* return the modeline based on GTF algorithm
*
* This function is to create the modeline based on the GTF algorithm.
* Generalized Timing Formula is derived from:
*
* GTF Spreadsheet by Andy Morrish (1/5/97)
* available at https://www.vesa.org
*
* And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
* What I have done is to translate it by using integer calculation.
* I also refer to the function of fb_get_mode in the file of
* drivers/video/fbmon.c
*
* Standard GTF parameters::
*
* M = 600
* C = 40
* K = 128
* J = 20
*
* Returns:
* The modeline based on the GTF algorithm stored in a drm_display_mode object.
* The display mode object is allocated with drm_mode_create(). Returns NULL
* when no mode could be allocated.
*/
struct drm_display_mode *
drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
bool interlaced, int margins)
{
return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
interlaced, margins,
600, 40 * 2, 128, 20 * 2);
}
EXPORT_SYMBOL(drm_gtf_mode);
#ifdef CONFIG_VIDEOMODE_HELPERS
/**
* drm_display_mode_from_videomode - fill in @dmode using @vm,
* @vm: videomode structure to use as source
* @dmode: drm_display_mode structure to use as destination
*
* Fills out @dmode using the display mode specified in @vm.
*/
void drm_display_mode_from_videomode(const struct videomode *vm,
struct drm_display_mode *dmode)
{
dmode->hdisplay = vm->hactive;
dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
dmode->htotal = dmode->hsync_end + vm->hback_porch;
dmode->vdisplay = vm->vactive;
dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
dmode->vtotal = dmode->vsync_end + vm->vback_porch;
dmode->clock = vm->pixelclock / 1000;
dmode->flags = 0;
if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
dmode->flags |= DRM_MODE_FLAG_PHSYNC;
else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
dmode->flags |= DRM_MODE_FLAG_NHSYNC;
if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
dmode->flags |= DRM_MODE_FLAG_PVSYNC;
else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
dmode->flags |= DRM_MODE_FLAG_NVSYNC;
if (vm->flags & DISPLAY_FLAGS_INTERLACED)
dmode->flags |= DRM_MODE_FLAG_INTERLACE;
if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
dmode->flags |= DRM_MODE_FLAG_DBLCLK;
drm_mode_set_name(dmode);
}
EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
/**
* drm_display_mode_to_videomode - fill in @vm using @dmode,
* @dmode: drm_display_mode structure to use as source
* @vm: videomode structure to use as destination
*
* Fills out @vm using the display mode specified in @dmode.
*/
void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
struct videomode *vm)
{
vm->hactive = dmode->hdisplay;
vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
vm->hback_porch = dmode->htotal - dmode->hsync_end;
vm->vactive = dmode->vdisplay;
vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
vm->vback_porch = dmode->vtotal - dmode->vsync_end;
vm->pixelclock = dmode->clock * 1000;
vm->flags = 0;
if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
vm->flags |= DISPLAY_FLAGS_INTERLACED;
if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
}
EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
/**
* drm_bus_flags_from_videomode - extract information about pixelclk and
* DE polarity from videomode and store it in a separate variable
* @vm: videomode structure to use
* @bus_flags: information about pixelclk, sync and DE polarity will be stored
* here
*
* Sets DRM_BUS_FLAG_DE_(LOW|HIGH), DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
* and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
* found in @vm
*/
void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
{
*bus_flags = 0;
if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
if (vm->flags & DISPLAY_FLAGS_DE_LOW)
*bus_flags |= DRM_BUS_FLAG_DE_LOW;
if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
}
EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
#ifdef CONFIG_OF
/**
* of_get_drm_display_mode - get a drm_display_mode from devicetree
* @np: device_node with the timing specification
* @dmode: will be set to the return value
* @bus_flags: information about pixelclk, sync and DE polarity
* @index: index into the list of display timings in devicetree
*
* This function is expensive and should only be used, if only one mode is to be
* read from DT. To get multiple modes start with of_get_display_timings and
* work with that instead.
*
* Returns:
* 0 on success, a negative errno code when no of videomode node was found.
*/
int of_get_drm_display_mode(struct device_node *np,
struct drm_display_mode *dmode, u32 *bus_flags,
int index)
{
struct videomode vm;
int ret;
ret = of_get_videomode(np, &vm, index);
if (ret)
return ret;
drm_display_mode_from_videomode(&vm, dmode);
if (bus_flags)
drm_bus_flags_from_videomode(&vm, bus_flags);
pr_debug("%pOF: got %dx%d display mode: " DRM_MODE_FMT "\n",
np, vm.hactive, vm.vactive, DRM_MODE_ARG(dmode));
return 0;
}
EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
/**
* of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
* @np: device_node with the panel-timing specification
* @dmode: will be set to the return value
* @bus_flags: information about pixelclk, sync and DE polarity
*
* The mandatory Device Tree properties width-mm and height-mm
* are read and set on the display mode.
*
* Returns:
* Zero on success, negative error code on failure.
*/
int of_get_drm_panel_display_mode(struct device_node *np,
struct drm_display_mode *dmode, u32 *bus_flags)
{
u32 width_mm = 0, height_mm = 0;
struct display_timing timing;
struct videomode vm;
int ret;
ret = of_get_display_timing(np, "panel-timing", &timing);
if (ret)
return ret;
videomode_from_timing(&timing, &vm);
memset(dmode, 0, sizeof(*dmode));
drm_display_mode_from_videomode(&vm, dmode);
if (bus_flags)
drm_bus_flags_from_videomode(&vm, bus_flags);
ret = of_property_read_u32(np, "width-mm", &width_mm);
if (ret)
return ret;
ret = of_property_read_u32(np, "height-mm", &height_mm);
if (ret)
return ret;
dmode->width_mm = width_mm;
dmode->height_mm = height_mm;
pr_debug(DRM_MODE_FMT "\n", DRM_MODE_ARG(dmode));
return 0;
}
EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
#endif /* CONFIG_OF */
#endif /* CONFIG_VIDEOMODE_HELPERS */
/**
* drm_mode_set_name - set the name on a mode
* @mode: name will be set in this mode
*
* Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
* with an optional 'i' suffix for interlaced modes.
*/
void drm_mode_set_name(struct drm_display_mode *mode)
{
bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
mode->hdisplay, mode->vdisplay,
interlaced ? "i" : "");
}
EXPORT_SYMBOL(drm_mode_set_name);
/**
* drm_mode_vrefresh - get the vrefresh of a mode
* @mode: mode
*
* Returns:
* @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
* value first if it is not yet set.
*/
int drm_mode_vrefresh(const struct drm_display_mode *mode)
{
unsigned int num, den;
if (mode->htotal == 0 || mode->vtotal == 0)
return 0;
num = mode->clock;
den = mode->htotal * mode->vtotal;
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
num *= 2;
if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
den *= 2;
if (mode->vscan > 1)
den *= mode->vscan;
return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
}
EXPORT_SYMBOL(drm_mode_vrefresh);
/**
* drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
* @mode: mode to query
* @hdisplay: hdisplay value to fill in
* @vdisplay: vdisplay value to fill in
*
* The vdisplay value will be doubled if the specified mode is a stereo mode of
* the appropriate layout.
*/
void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
int *hdisplay, int *vdisplay)
{
struct drm_display_mode adjusted;
drm_mode_init(&adjusted, mode);
drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
*hdisplay = adjusted.crtc_hdisplay;
*vdisplay = adjusted.crtc_vdisplay;
}
EXPORT_SYMBOL(drm_mode_get_hv_timing);
/**
* drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
* @p: mode
* @adjust_flags: a combination of adjustment flags
*
* Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
*
* - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
* interlaced modes.
* - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
* buffers containing two eyes (only adjust the timings when needed, eg. for
* "frame packing" or "side by side full").
* - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
* be performed for doublescan and vscan > 1 modes respectively.
*/
void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
{
if (!p)
return;
p->crtc_clock = p->clock;
p->crtc_hdisplay = p->hdisplay;
p->crtc_hsync_start = p->hsync_start;
p->crtc_hsync_end = p->hsync_end;
p->crtc_htotal = p->htotal;
p->crtc_hskew = p->hskew;
p->crtc_vdisplay = p->vdisplay;
p->crtc_vsync_start = p->vsync_start;
p->crtc_vsync_end = p->vsync_end;
p->crtc_vtotal = p->vtotal;
if (p->flags & DRM_MODE_FLAG_INTERLACE) {
if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
p->crtc_vdisplay /= 2;
p->crtc_vsync_start /= 2;
p->crtc_vsync_end /= 2;
p->crtc_vtotal /= 2;
}
}
if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
p->crtc_vdisplay *= 2;
p->crtc_vsync_start *= 2;
p->crtc_vsync_end *= 2;
p->crtc_vtotal *= 2;
}
}
if (!(adjust_flags & CRTC_NO_VSCAN)) {
if (p->vscan > 1) {
p->crtc_vdisplay *= p->vscan;
p->crtc_vsync_start *= p->vscan;
p->crtc_vsync_end *= p->vscan;
p->crtc_vtotal *= p->vscan;
}
}
if (adjust_flags & CRTC_STEREO_DOUBLE) {
unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
switch (layout) {
case DRM_MODE_FLAG_3D_FRAME_PACKING:
p->crtc_clock *= 2;
p->crtc_vdisplay += p->crtc_vtotal;
p->crtc_vsync_start += p->crtc_vtotal;
p->crtc_vsync_end += p->crtc_vtotal;
p->crtc_vtotal += p->crtc_vtotal;
break;
}
}
p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
}
EXPORT_SYMBOL(drm_mode_set_crtcinfo);
/**
* drm_mode_copy - copy the mode
* @dst: mode to overwrite
* @src: mode to copy
*
* Copy an existing mode into another mode, preserving the
* list head of the destination mode.
*/
void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
{
struct list_head head = dst->head;
*dst = *src;
dst->head = head;
}
EXPORT_SYMBOL(drm_mode_copy);
/**
* drm_mode_init - initialize the mode from another mode
* @dst: mode to overwrite
* @src: mode to copy
*
* Copy an existing mode into another mode, zeroing the
* list head of the destination mode. Typically used
* to guarantee the list head is not left with stack
* garbage in on-stack modes.
*/
void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
{
memset(dst, 0, sizeof(*dst));
drm_mode_copy(dst, src);
}
EXPORT_SYMBOL(drm_mode_init);
/**
* drm_mode_duplicate - allocate and duplicate an existing mode
* @dev: drm_device to allocate the duplicated mode for
* @mode: mode to duplicate
*
* Just allocate a new mode, copy the existing mode into it, and return
* a pointer to it. Used to create new instances of established modes.
*
* Returns:
* Pointer to duplicated mode on success, NULL on error.
*/
struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
const struct drm_display_mode *mode)
{
struct drm_display_mode *nmode;
nmode = drm_mode_create(dev);
if (!nmode)
return NULL;
drm_mode_copy(nmode, mode);
return nmode;
}
EXPORT_SYMBOL(drm_mode_duplicate);
static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
const struct drm_display_mode *mode2)
{
return mode1->hdisplay == mode2->hdisplay &&
mode1->hsync_start == mode2->hsync_start &&
mode1->hsync_end == mode2->hsync_end &&
mode1->htotal == mode2->htotal &&
mode1->hskew == mode2->hskew &&
mode1->vdisplay == mode2->vdisplay &&
mode1->vsync_start == mode2->vsync_start &&
mode1->vsync_end == mode2->vsync_end &&
mode1->vtotal == mode2->vtotal &&
mode1->vscan == mode2->vscan;
}
static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
const struct drm_display_mode *mode2)
{
/*
* do clock check convert to PICOS
* so fb modes get matched the same
*/
if (mode1->clock && mode2->clock)
return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
else
return mode1->clock == mode2->clock;
}
static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
const struct drm_display_mode *mode2)
{
return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
(mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
}
static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
const struct drm_display_mode *mode2)
{
return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
(mode2->flags & DRM_MODE_FLAG_3D_MASK);
}
static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
const struct drm_display_mode *mode2)
{
return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
}
/**
* drm_mode_match - test modes for (partial) equality
* @mode1: first mode
* @mode2: second mode
* @match_flags: which parts need to match (DRM_MODE_MATCH_*)
*
* Check to see if @mode1 and @mode2 are equivalent.
*
* Returns:
* True if the modes are (partially) equal, false otherwise.
*/
bool drm_mode_match(const struct drm_display_mode *mode1,
const struct drm_display_mode *mode2,
unsigned int match_flags)
{
if (!mode1 && !mode2)
return true;
if (!mode1 || !mode2)
return false;
if (match_flags & DRM_MODE_MATCH_TIMINGS &&
!drm_mode_match_timings(mode1, mode2))
return false;
if (match_flags & DRM_MODE_MATCH_CLOCK &&
!drm_mode_match_clock(mode1, mode2))
return false;
if (match_flags & DRM_MODE_MATCH_FLAGS &&
!drm_mode_match_flags(mode1, mode2))
return false;
if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
!drm_mode_match_3d_flags(mode1, mode2))
return false;
if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
!drm_mode_match_aspect_ratio(mode1, mode2))
return false;
return true;
}
EXPORT_SYMBOL(drm_mode_match);
/**
* drm_mode_equal - test modes for equality
* @mode1: first mode
* @mode2: second mode
*
* Check to see if @mode1 and @mode2 are equivalent.
*
* Returns:
* True if the modes are equal, false otherwise.
*/
bool drm_mode_equal(const struct drm_display_mode *mode1,
const struct drm_display_mode *mode2)
{
return drm_mode_match(mode1, mode2,
DRM_MODE_MATCH_TIMINGS |
DRM_MODE_MATCH_CLOCK |
DRM_MODE_MATCH_FLAGS |
DRM_MODE_MATCH_3D_FLAGS|
DRM_MODE_MATCH_ASPECT_RATIO);
}
EXPORT_SYMBOL(drm_mode_equal);
/**
* drm_mode_equal_no_clocks - test modes for equality
* @mode1: first mode
* @mode2: second mode
*
* Check to see if @mode1 and @mode2 are equivalent, but
* don't check the pixel clocks.
*
* Returns:
* True if the modes are equal, false otherwise.
*/
bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
const struct drm_display_mode *mode2)
{
return drm_mode_match(mode1, mode2,
DRM_MODE_MATCH_TIMINGS |
DRM_MODE_MATCH_FLAGS |
DRM_MODE_MATCH_3D_FLAGS);
}
EXPORT_SYMBOL(drm_mode_equal_no_clocks);
/**
* drm_mode_equal_no_clocks_no_stereo - test modes for equality
* @mode1: first mode
* @mode2: second mode
*
* Check to see if @mode1 and @mode2 are equivalent, but
* don't check the pixel clocks nor the stereo layout.
*
* Returns:
* True if the modes are equal, false otherwise.
*/
bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
const struct drm_display_mode *mode2)
{
return drm_mode_match(mode1, mode2,
DRM_MODE_MATCH_TIMINGS |
DRM_MODE_MATCH_FLAGS);
}
EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
static enum drm_mode_status
drm_mode_validate_basic(const struct drm_display_mode *mode)
{
if (mode->type & ~DRM_MODE_TYPE_ALL)
return MODE_BAD;
if (mode->flags & ~DRM_MODE_FLAG_ALL)
return MODE_BAD;
if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
return MODE_BAD;
if (mode->clock == 0)
return MODE_CLOCK_LOW;
if (mode->hdisplay == 0 ||
mode->hsync_start < mode->hdisplay ||
mode->hsync_end < mode->hsync_start ||
mode->htotal < mode->hsync_end)
return MODE_H_ILLEGAL;
if (mode->vdisplay == 0 ||
mode->vsync_start < mode->vdisplay ||
mode->vsync_end < mode->vsync_start ||
mode->vtotal < mode->vsync_end)
return MODE_V_ILLEGAL;
return MODE_OK;
}
/**
* drm_mode_validate_driver - make sure the mode is somewhat sane
* @dev: drm device
* @mode: mode to check
*
* First do basic validation on the mode, and then allow the driver
* to check for device/driver specific limitations via the optional
* &drm_mode_config_helper_funcs.mode_valid hook.
*
* Returns:
* The mode status
*/
enum drm_mode_status
drm_mode_validate_driver(struct drm_device *dev,
const struct drm_display_mode *mode)
{
enum drm_mode_status status;
status = drm_mode_validate_basic(mode);
if (status != MODE_OK)
return status;
if (dev->mode_config.funcs->mode_valid)
return dev->mode_config.funcs->mode_valid(dev, mode);
else
return MODE_OK;
}
EXPORT_SYMBOL(drm_mode_validate_driver);
/**
* drm_mode_validate_size - make sure modes adhere to size constraints
* @mode: mode to check
* @maxX: maximum width
* @maxY: maximum height
*
* This function is a helper which can be used to validate modes against size
* limitations of the DRM device/connector. If a mode is too big its status
* member is updated with the appropriate validation failure code. The list
* itself is not changed.
*
* Returns:
* The mode status
*/
enum drm_mode_status
drm_mode_validate_size(const struct drm_display_mode *mode,
int maxX, int maxY)
{
if (maxX > 0 && mode->hdisplay > maxX)
return MODE_VIRTUAL_X;
if (maxY > 0 && mode->vdisplay > maxY)
return MODE_VIRTUAL_Y;
return MODE_OK;
}
EXPORT_SYMBOL(drm_mode_validate_size);
/**
* drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
* @mode: mode to check
* @connector: drm connector under action
*
* This function is a helper which can be used to filter out any YCBCR420
* only mode, when the source doesn't support it.
*
* Returns:
* The mode status
*/
enum drm_mode_status
drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
struct drm_connector *connector)
{
if (!connector->ycbcr_420_allowed &&
drm_mode_is_420_only(&connector->display_info, mode))
return MODE_NO_420;
return MODE_OK;
}
EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
#define MODE_STATUS(status) [MODE_ ## status + 3] = #status
static const char * const drm_mode_status_names[] = {
MODE_STATUS(OK),
MODE_STATUS(HSYNC),
MODE_STATUS(VSYNC),
MODE_STATUS(H_ILLEGAL),
MODE_STATUS(V_ILLEGAL),
MODE_STATUS(BAD_WIDTH),
MODE_STATUS(NOMODE),
MODE_STATUS(NO_INTERLACE),
MODE_STATUS(NO_DBLESCAN),
MODE_STATUS(NO_VSCAN),
MODE_STATUS(MEM),
MODE_STATUS(VIRTUAL_X),
MODE_STATUS(VIRTUAL_Y),
MODE_STATUS(MEM_VIRT),
MODE_STATUS(NOCLOCK),
MODE_STATUS(CLOCK_HIGH),
MODE_STATUS(CLOCK_LOW),
MODE_STATUS(CLOCK_RANGE),
MODE_STATUS(BAD_HVALUE),
MODE_STATUS(BAD_VVALUE),
MODE_STATUS(BAD_VSCAN),
MODE_STATUS(HSYNC_NARROW),
MODE_STATUS(HSYNC_WIDE),
MODE_STATUS(HBLANK_NARROW),
MODE_STATUS(HBLANK_WIDE),
MODE_STATUS(VSYNC_NARROW),
MODE_STATUS(VSYNC_WIDE),
MODE_STATUS(VBLANK_NARROW),
MODE_STATUS(VBLANK_WIDE),
MODE_STATUS(PANEL),
MODE_STATUS(INTERLACE_WIDTH),
MODE_STATUS(ONE_WIDTH),
MODE_STATUS(ONE_HEIGHT),
MODE_STATUS(ONE_SIZE),
MODE_STATUS(NO_REDUCED),
MODE_STATUS(NO_STEREO),
MODE_STATUS(NO_420),
MODE_STATUS(STALE),
MODE_STATUS(BAD),
MODE_STATUS(ERROR),
};
#undef MODE_STATUS
const char *drm_get_mode_status_name(enum drm_mode_status status)
{
int index = status + 3;
if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
return "";
return drm_mode_status_names[index];
}
/**
* drm_mode_prune_invalid - remove invalid modes from mode list
* @dev: DRM device
* @mode_list: list of modes to check
* @verbose: be verbose about it
*
* This helper function can be used to prune a display mode list after
* validation has been completed. All modes whose status is not MODE_OK will be
* removed from the list, and if @verbose the status code and mode name is also
* printed to dmesg.
*/
void drm_mode_prune_invalid(struct drm_device *dev,
struct list_head *mode_list, bool verbose)
{
struct drm_display_mode *mode, *t;
list_for_each_entry_safe(mode, t, mode_list, head) {
if (mode->status != MODE_OK) {
list_del(&mode->head);
if (mode->type & DRM_MODE_TYPE_USERDEF) {
drm_warn(dev, "User-defined mode not supported: "
DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
}
if (verbose) {
drm_dbg_kms(dev, "Rejected mode: " DRM_MODE_FMT " (%s)\n",
DRM_MODE_ARG(mode), drm_get_mode_status_name(mode->status));
}
drm_mode_destroy(dev, mode);
}
}
}
EXPORT_SYMBOL(drm_mode_prune_invalid);
/**
* drm_mode_compare - compare modes for favorability
* @priv: unused
* @lh_a: list_head for first mode
* @lh_b: list_head for second mode
*
* Compare two modes, given by @lh_a and @lh_b, returning a value indicating
* which is better.
*
* Returns:
* Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
* positive if @lh_b is better than @lh_a.
*/
static int drm_mode_compare(void *priv, const struct list_head *lh_a,
const struct list_head *lh_b)
{
struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
int diff;
diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
if (diff)
return diff;
diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
if (diff)
return diff;
diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
if (diff)
return diff;
diff = b->clock - a->clock;
return diff;
}
/**
* drm_mode_sort - sort mode list
* @mode_list: list of drm_display_mode structures to sort
*
* Sort @mode_list by favorability, moving good modes to the head of the list.
*/
void drm_mode_sort(struct list_head *mode_list)
{
list_sort(NULL, mode_list, drm_mode_compare);
}
EXPORT_SYMBOL(drm_mode_sort);
/**
* drm_connector_list_update - update the mode list for the connector
* @connector: the connector to update
*
* This moves the modes from the @connector probed_modes list
* to the actual mode list. It compares the probed mode against the current
* list and only adds different/new modes.
*
* This is just a helper functions doesn't validate any modes itself and also
* doesn't prune any invalid modes. Callers need to do that themselves.
*/
void drm_connector_list_update(struct drm_connector *connector)
{
struct drm_display_mode *pmode, *pt;
WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
struct drm_display_mode *mode;
bool found_it = false;
/* go through current modes checking for the new probed mode */
list_for_each_entry(mode, &connector->modes, head) {
if (!drm_mode_equal(pmode, mode))
continue;
found_it = true;
/*
* If the old matching mode is stale (ie. left over
* from a previous probe) just replace it outright.
* Otherwise just merge the type bits between all
* equal probed modes.
*
* If two probed modes are considered equal, pick the
* actual timings from the one that's marked as
* preferred (in case the match isn't 100%). If
* multiple or zero preferred modes are present, favor
* the mode added to the probed_modes list first.
*/
if (mode->status == MODE_STALE) {
drm_mode_copy(mode, pmode);
} else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
(pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
pmode->type |= mode->type;
drm_mode_copy(mode, pmode);
} else {
mode->type |= pmode->type;
}
list_del(&pmode->head);
drm_mode_destroy(connector->dev, pmode);
break;
}
if (!found_it) {
list_move_tail(&pmode->head, &connector->modes);
}
}
}
EXPORT_SYMBOL(drm_connector_list_update);
static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
struct drm_cmdline_mode *mode)
{
unsigned int bpp;
if (str[0] != '-')
return -EINVAL;
str++;
bpp = simple_strtol(str, end_ptr, 10);
if (*end_ptr == str)
return -EINVAL;
mode->bpp = bpp;
mode->bpp_specified = true;
return 0;
}
static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
struct drm_cmdline_mode *mode)
{
unsigned int refresh;
if (str[0] != '@')
return -EINVAL;
str++;
refresh = simple_strtol(str, end_ptr, 10);
if (*end_ptr == str)
return -EINVAL;
mode->refresh = refresh;
mode->refresh_specified = true;
return 0;
}
static int drm_mode_parse_cmdline_extra(const char *str, int length,
bool freestanding,
const struct drm_connector *connector,
struct drm_cmdline_mode *mode)
{
int i;
for (i = 0; i < length; i++) {
switch (str[i]) {
case 'i':
if (freestanding)
return -EINVAL;
mode->interlace = true;
break;
case 'm':
if (freestanding)
return -EINVAL;
mode->margins = true;
break;
case 'D':
if (mode->force != DRM_FORCE_UNSPECIFIED)
return -EINVAL;
if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
(connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
mode->force = DRM_FORCE_ON;
else
mode->force = DRM_FORCE_ON_DIGITAL;
break;
case 'd':
if (mode->force != DRM_FORCE_UNSPECIFIED)
return -EINVAL;
mode->force = DRM_FORCE_OFF;
break;
case 'e':
if (mode->force != DRM_FORCE_UNSPECIFIED)
return -EINVAL;
mode->force = DRM_FORCE_ON;
break;
default:
return -EINVAL;
}
}
return 0;
}
static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
bool extras,
const struct drm_connector *connector,
struct drm_cmdline_mode *mode)
{
const char *str_start = str;
bool rb = false, cvt = false;
int xres = 0, yres = 0;
int remaining, i;
char *end_ptr;
xres = simple_strtol(str, &end_ptr, 10);
if (end_ptr == str)
return -EINVAL;
if (end_ptr[0] != 'x')
return -EINVAL;
end_ptr++;
str = end_ptr;
yres = simple_strtol(str, &end_ptr, 10);
if (end_ptr == str)
return -EINVAL;
remaining = length - (end_ptr - str_start);
if (remaining < 0)
return -EINVAL;
for (i = 0; i < remaining; i++) {
switch (end_ptr[i]) {
case 'M':
cvt = true;
break;
case 'R':
rb = true;
break;
default:
/*
* Try to pass that to our extras parsing
* function to handle the case where the
* extras are directly after the resolution
*/
if (extras) {
int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
1,
false,
connector,
mode);
if (ret)
return ret;
} else {
return -EINVAL;
}
}
}
mode->xres = xres;
mode->yres = yres;
mode->cvt = cvt;
mode->rb = rb;
return 0;
}
static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
{
const char *value;
char *endp;
/*
* delim must point to the '=', otherwise it is a syntax error and
* if delim points to the terminating zero, then delim + 1 will point
* past the end of the string.
*/
if (*delim != '=')
return -EINVAL;
value = delim + 1;
*int_ret = simple_strtol(value, &endp, 10);
/* Make sure we have parsed something */
if (endp == value)
return -EINVAL;
return 0;
}
static int drm_mode_parse_panel_orientation(const char *delim,
struct drm_cmdline_mode *mode)
{
const char *value;
if (*delim != '=')
return -EINVAL;
value = delim + 1;
delim = strchr(value, ',');
if (!delim)
delim = value + strlen(value);
if (!strncmp(value, "normal", delim - value))
mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
else if (!strncmp(value, "upside_down", delim - value))
mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
else if (!strncmp(value, "left_side_up", delim - value))
mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
else if (!strncmp(value, "right_side_up", delim - value))
mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
else
return -EINVAL;
return 0;
}
static int drm_mode_parse_tv_mode(const char *delim,
struct drm_cmdline_mode *mode)
{
const char *value;
int ret;
if (*delim != '=')
return -EINVAL;
value = delim + 1;
delim = strchr(value, ',');
if (!delim)
delim = value + strlen(value);
ret = drm_get_tv_mode_from_name(value, delim - value);
if (ret < 0)
return ret;
mode->tv_mode_specified = true;
mode->tv_mode = ret;
return 0;
}
static int drm_mode_parse_cmdline_options(const char *str,
bool freestanding,
const struct drm_connector *connector,
struct drm_cmdline_mode *mode)
{
unsigned int deg, margin, rotation = 0;
const char *delim, *option, *sep;
option = str;
do {
delim = strchr(option, '=');
if (!delim) {
delim = strchr(option, ',');
if (!delim)
delim = option + strlen(option);
}
if (!strncmp(option, "rotate", delim - option)) {
if (drm_mode_parse_cmdline_int(delim, &deg))
return -EINVAL;
switch (deg) {
case 0:
rotation |= DRM_MODE_ROTATE_0;
break;
case 90:
rotation |= DRM_MODE_ROTATE_90;
break;
case 180:
rotation |= DRM_MODE_ROTATE_180;
break;
case 270:
rotation |= DRM_MODE_ROTATE_270;
break;
default:
return -EINVAL;
}
} else if (!strncmp(option, "reflect_x", delim - option)) {
rotation |= DRM_MODE_REFLECT_X;
} else if (!strncmp(option, "reflect_y", delim - option)) {
rotation |= DRM_MODE_REFLECT_Y;
} else if (!strncmp(option, "margin_right", delim - option)) {
if (drm_mode_parse_cmdline_int(delim, &margin))
return -EINVAL;
mode->tv_margins.right = margin;
} else if (!strncmp(option, "margin_left", delim - option)) {
if (drm_mode_parse_cmdline_int(delim, &margin))
return -EINVAL;
mode->tv_margins.left = margin;
} else if (!strncmp(option, "margin_top", delim - option)) {
if (drm_mode_parse_cmdline_int(delim, &margin))
return -EINVAL;
mode->tv_margins.top = margin;
} else if (!strncmp(option, "margin_bottom", delim - option)) {
if (drm_mode_parse_cmdline_int(delim, &margin))
return -EINVAL;
mode->tv_margins.bottom = margin;
} else if (!strncmp(option, "panel_orientation", delim - option)) {
if (drm_mode_parse_panel_orientation(delim, mode))
return -EINVAL;
} else if (!strncmp(option, "tv_mode", delim - option)) {
if (drm_mode_parse_tv_mode(delim, mode))
return -EINVAL;
} else {
return -EINVAL;
}
sep = strchr(delim, ',');
option = sep + 1;
} while (sep);
if (rotation && freestanding)
return -EINVAL;
if (!(rotation & DRM_MODE_ROTATE_MASK))
rotation |= DRM_MODE_ROTATE_0;
/* Make sure there is exactly one rotation defined */
if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
return -EINVAL;
mode->rotation_reflection = rotation;
return 0;
}
struct drm_named_mode {
const char *name;
unsigned int pixel_clock_khz;
unsigned int xres;
unsigned int yres;
unsigned int flags;
unsigned int tv_mode;
};
#define NAMED_MODE(_name, _pclk, _x, _y, _flags, _mode) \
{ \
.name = _name, \
.pixel_clock_khz = _pclk, \
.xres = _x, \
.yres = _y, \
.flags = _flags, \
.tv_mode = _mode, \
}
static const struct drm_named_mode drm_named_modes[] = {
NAMED_MODE("NTSC", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC),
NAMED_MODE("NTSC-J", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC_J),
NAMED_MODE("PAL", 13500, 720, 576, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL),
NAMED_MODE("PAL-M", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL_M),
};
static int drm_mode_parse_cmdline_named_mode(const char *name,
unsigned int name_end,
struct drm_cmdline_mode *cmdline_mode)
{
unsigned int i;
if (!name_end)
return 0;
/* If the name starts with a digit, it's not a named mode */
if (isdigit(name[0]))
return 0;
/*
* If there's an equal sign in the name, the command-line
* contains only an option and no mode.
*/
if (strnchr(name, name_end, '='))
return 0;
/* The connection status extras can be set without a mode. */
if (name_end == 1 &&
(name[0] == 'd' || name[0] == 'D' || name[0] == 'e'))
return 0;
/*
* We're sure we're a named mode at this point, iterate over the
* list of modes we're aware of.
*/
for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
const struct drm_named_mode *mode = &drm_named_modes[i];
int ret;
ret = str_has_prefix(name, mode->name);
if (ret != name_end)
continue;
strscpy(cmdline_mode->name, mode->name, sizeof(cmdline_mode->name));
cmdline_mode->pixel_clock = mode->pixel_clock_khz;
cmdline_mode->xres = mode->xres;
cmdline_mode->yres = mode->yres;
cmdline_mode->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
cmdline_mode->tv_mode = mode->tv_mode;
cmdline_mode->tv_mode_specified = true;
cmdline_mode->specified = true;
return 1;
}
return -EINVAL;
}
/**
* drm_mode_parse_command_line_for_connector - parse command line modeline for connector
* @mode_option: optional per connector mode option
* @connector: connector to parse modeline for
* @mode: preallocated drm_cmdline_mode structure to fill out
*
* This parses @mode_option command line modeline for modes and options to
* configure the connector.
*
* This uses the same parameters as the fb modedb.c, except for an extra
* force-enable, force-enable-digital and force-disable bit at the end::
*
* <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
*
* Additionals options can be provided following the mode, using a comma to
* separate each option. Valid options can be found in
* Documentation/fb/modedb.rst.
*
* The intermediate drm_cmdline_mode structure is required to store additional
* options from the command line modline like the force-enable/disable flag.
*
* Returns:
* True if a valid modeline has been parsed, false otherwise.
*/
bool drm_mode_parse_command_line_for_connector(const char *mode_option,
const struct drm_connector *connector,
struct drm_cmdline_mode *mode)
{
const char *name;
bool freestanding = false, parse_extras = false;
unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
unsigned int mode_end = 0;
const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
const char *options_ptr = NULL;
char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
int len, ret;
memset(mode, 0, sizeof(*mode));
mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
if (!mode_option)
return false;
name = mode_option;
/* Locate the start of named options */
options_ptr = strchr(name, ',');
if (options_ptr)
options_off = options_ptr - name;
else
options_off = strlen(name);
/* Try to locate the bpp and refresh specifiers, if any */
bpp_ptr = strnchr(name, options_off, '-');
while (bpp_ptr && !isdigit(bpp_ptr[1]))
bpp_ptr = strnchr(bpp_ptr + 1, options_off, '-');
if (bpp_ptr)
bpp_off = bpp_ptr - name;
refresh_ptr = strnchr(name, options_off, '@');
if (refresh_ptr)
refresh_off = refresh_ptr - name;
/* Locate the end of the name / resolution, and parse it */
if (bpp_ptr) {
mode_end = bpp_off;
} else if (refresh_ptr) {
mode_end = refresh_off;
} else if (options_ptr) {
mode_end = options_off;
parse_extras = true;
} else {
mode_end = strlen(name);
parse_extras = true;
}
if (!mode_end)
return false;
ret = drm_mode_parse_cmdline_named_mode(name, mode_end, mode);
if (ret < 0)
return false;
/*
* Having a mode that starts by a letter (and thus is named) and
* an at-sign (used to specify a refresh rate) is disallowed.
*/
if (ret && refresh_ptr)
return false;
/* No named mode? Check for a normal mode argument, e.g. 1024x768 */
if (!mode->specified && isdigit(name[0])) {
ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
parse_extras,
connector,
mode);
if (ret)
return false;
mode->specified = true;
}
/* No mode? Check for freestanding extras and/or options */
if (!mode->specified) {
unsigned int len = strlen(mode_option);
if (bpp_ptr || refresh_ptr)
return false; /* syntax error */
if (len == 1 || (len >= 2 && mode_option[1] == ','))
extra_ptr = mode_option;
else
options_ptr = mode_option - 1;
freestanding = true;
}
if (bpp_ptr) {
ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
if (ret)
return false;
mode->bpp_specified = true;
}
if (refresh_ptr) {
ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
&refresh_end_ptr, mode);
if (ret)
return false;
mode->refresh_specified = true;
}
/*
* Locate the end of the bpp / refresh, and parse the extras
* if relevant
*/
if (bpp_ptr && refresh_ptr)
extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
else if (bpp_ptr)
extra_ptr = bpp_end_ptr;
else if (refresh_ptr)
extra_ptr = refresh_end_ptr;
if (extra_ptr) {
if (options_ptr)
len = options_ptr - extra_ptr;
else
len = strlen(extra_ptr);
ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
connector, mode);
if (ret)
return false;
}
if (options_ptr) {
ret = drm_mode_parse_cmdline_options(options_ptr + 1,
freestanding,
connector, mode);
if (ret)
return false;
}
return true;
}
EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
static struct drm_display_mode *drm_named_mode(struct drm_device *dev,
struct drm_cmdline_mode *cmd)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
const struct drm_named_mode *named_mode = &drm_named_modes[i];
if (strcmp(cmd->name, named_mode->name))
continue;
if (!cmd->tv_mode_specified)
continue;
return drm_analog_tv_mode(dev,
named_mode->tv_mode,
named_mode->pixel_clock_khz * 1000,
named_mode->xres,
named_mode->yres,
named_mode->flags & DRM_MODE_FLAG_INTERLACE);
}
return NULL;
}
/**
* drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
* @dev: DRM device to create the new mode for
* @cmd: input command line modeline
*
* Returns:
* Pointer to converted mode on success, NULL on error.
*/
struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device *dev,
struct drm_cmdline_mode *cmd)
{
struct drm_display_mode *mode;
if (cmd->xres == 0 || cmd->yres == 0)
return NULL;
if (strlen(cmd->name))
mode = drm_named_mode(dev, cmd);
else if (cmd->cvt)
mode = drm_cvt_mode(dev,
cmd->xres, cmd->yres,
cmd->refresh_specified ? cmd->refresh : 60,
cmd->rb, cmd->interlace,
cmd->margins);
else
mode = drm_gtf_mode(dev,
cmd->xres, cmd->yres,
cmd->refresh_specified ? cmd->refresh : 60,
cmd->interlace,
cmd->margins);
if (!mode)
return NULL;
mode->type |= DRM_MODE_TYPE_USERDEF;
/* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
if (cmd->xres == 1366)
drm_mode_fixup_1366x768(mode);
drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
return mode;
}
EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
/**
* drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo
* @out: drm_mode_modeinfo struct to return to the user
* @in: drm_display_mode to use
*
* Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
* the user.
*/
void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
const struct drm_display_mode *in)
{
out->clock = in->clock;
out->hdisplay = in->hdisplay;
out->hsync_start = in->hsync_start;
out->hsync_end = in->hsync_end;
out->htotal = in->htotal;
out->hskew = in->hskew;
out->vdisplay = in->vdisplay;
out->vsync_start = in->vsync_start;
out->vsync_end = in->vsync_end;
out->vtotal = in->vtotal;
out->vscan = in->vscan;
out->vrefresh = drm_mode_vrefresh(in);
out->flags = in->flags;
out->type = in->type;
switch (in->picture_aspect_ratio) {
case HDMI_PICTURE_ASPECT_4_3:
out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
break;
case HDMI_PICTURE_ASPECT_16_9:
out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
break;
case HDMI_PICTURE_ASPECT_64_27:
out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
break;
case HDMI_PICTURE_ASPECT_256_135:
out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
break;
default:
WARN(1, "Invalid aspect ratio (0%x) on mode\n",
in->picture_aspect_ratio);
fallthrough;
case HDMI_PICTURE_ASPECT_NONE:
out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
break;
}
strscpy_pad(out->name, in->name, sizeof(out->name));
}
/**
* drm_mode_convert_umode - convert a modeinfo into a drm_display_mode
* @dev: drm device
* @out: drm_display_mode to return to the user
* @in: drm_mode_modeinfo to use
*
* Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
* the caller.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_mode_convert_umode(struct drm_device *dev,
struct drm_display_mode *out,
const struct drm_mode_modeinfo *in)
{
if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
return -ERANGE;
out->clock = in->clock;
out->hdisplay = in->hdisplay;
out->hsync_start = in->hsync_start;
out->hsync_end = in->hsync_end;
out->htotal = in->htotal;
out->hskew = in->hskew;
out->vdisplay = in->vdisplay;
out->vsync_start = in->vsync_start;
out->vsync_end = in->vsync_end;
out->vtotal = in->vtotal;
out->vscan = in->vscan;
out->flags = in->flags;
/*
* Old xf86-video-vmware (possibly others too) used to
* leave 'type' uninitialized. Just ignore any bits we
* don't like. It's a just hint after all, and more
* useful for the kernel->userspace direction anyway.
*/
out->type = in->type & DRM_MODE_TYPE_ALL;
strscpy_pad(out->name, in->name, sizeof(out->name));
/* Clearing picture aspect ratio bits from out flags,
* as the aspect-ratio information is not stored in
* flags for kernel-mode, but in picture_aspect_ratio.
*/
out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
case DRM_MODE_FLAG_PIC_AR_4_3:
out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
break;
case DRM_MODE_FLAG_PIC_AR_16_9:
out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
break;
case DRM_MODE_FLAG_PIC_AR_64_27:
out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
break;
case DRM_MODE_FLAG_PIC_AR_256_135:
out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
break;
case DRM_MODE_FLAG_PIC_AR_NONE:
out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
break;
default:
return -EINVAL;
}
out->status = drm_mode_validate_driver(dev, out);
if (out->status != MODE_OK)
return -EINVAL;
drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
return 0;
}
/**
* drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
* output format
*
* @display: display under action
* @mode: video mode to be tested.
*
* Returns:
* true if the mode can be supported in YCBCR420 format
* false if not.
*/
bool drm_mode_is_420_only(const struct drm_display_info *display,
const struct drm_display_mode *mode)
{
u8 vic = drm_match_cea_mode(mode);
return test_bit(vic, display->hdmi.y420_vdb_modes);
}
EXPORT_SYMBOL(drm_mode_is_420_only);
/**
* drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
* output format also (along with RGB/YCBCR444/422)
*
* @display: display under action.
* @mode: video mode to be tested.
*
* Returns:
* true if the mode can be support YCBCR420 format
* false if not.
*/
bool drm_mode_is_420_also(const struct drm_display_info *display,
const struct drm_display_mode *mode)
{
u8 vic = drm_match_cea_mode(mode);
return test_bit(vic, display->hdmi.y420_cmdb_modes);
}
EXPORT_SYMBOL(drm_mode_is_420_also);
/**
* drm_mode_is_420 - if a given videomode can be supported in YCBCR420
* output format
*
* @display: display under action.
* @mode: video mode to be tested.
*
* Returns:
* true if the mode can be supported in YCBCR420 format
* false if not.
*/
bool drm_mode_is_420(const struct drm_display_info *display,
const struct drm_display_mode *mode)
{
return drm_mode_is_420_only(display, mode) ||
drm_mode_is_420_also(display, mode);
}
EXPORT_SYMBOL(drm_mode_is_420);
/**
* drm_set_preferred_mode - Sets the preferred mode of a connector
* @connector: connector whose mode list should be processed
* @hpref: horizontal resolution of preferred mode
* @vpref: vertical resolution of preferred mode
*
* Marks a mode as preferred if it matches the resolution specified by @hpref
* and @vpref.
*/
void drm_set_preferred_mode(struct drm_connector *connector,
int hpref, int vpref)
{
struct drm_display_mode *mode;
list_for_each_entry(mode, &connector->probed_modes, head) {
if (mode->hdisplay == hpref &&
mode->vdisplay == vpref)
mode->type |= DRM_MODE_TYPE_PREFERRED;
}
}
EXPORT_SYMBOL(drm_set_preferred_mode);