blob: 0daaeb54ff6f0c208f43c5d973f46d1989f87d1c [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <>
#include <drm/drm_aperture.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_prime.h>
#include "msm_drv.h"
#include "msm_gem.h"
#include "msm_kms.h"
static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
* fbdev funcs, to implement legacy fbdev interface on top of drm driver
#define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
struct msm_fbdev {
struct drm_fb_helper base;
struct drm_framebuffer *fb;
static const struct fb_ops msm_fb_ops = {
.owner = THIS_MODULE,
/* Note: to properly handle manual update displays, we wrap the
* basic fbdev ops which write to the framebuffer
.fb_read = drm_fb_helper_sys_read,
.fb_write = drm_fb_helper_sys_write,
.fb_fillrect = drm_fb_helper_sys_fillrect,
.fb_copyarea = drm_fb_helper_sys_copyarea,
.fb_imageblit = drm_fb_helper_sys_imageblit,
.fb_mmap = msm_fbdev_mmap,
static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
struct msm_fbdev *fbdev = to_msm_fbdev(helper);
struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
return drm_gem_prime_mmap(bo, vma);
static int msm_fbdev_create(struct drm_fb_helper *helper,
struct drm_fb_helper_surface_size *sizes)
struct msm_fbdev *fbdev = to_msm_fbdev(helper);
struct drm_device *dev = helper->dev;
struct msm_drm_private *priv = dev->dev_private;
struct drm_framebuffer *fb = NULL;
struct drm_gem_object *bo;
struct fb_info *fbi = NULL;
uint64_t paddr;
uint32_t format;
int ret, pitch;
format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
sizes->surface_height, sizes->surface_bpp,
sizes->fb_width, sizes->fb_height);
pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
sizes->surface_height, pitch, format);
if (IS_ERR(fb)) {
DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
return PTR_ERR(fb);
bo = msm_framebuffer_bo(fb, 0);
* NOTE: if we can be guaranteed to be able to map buffer
* in panic (ie. lock-safe, etc) we could avoid pinning the
* buffer now:
ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
if (ret) {
DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
goto fail_unlock;
fbi = drm_fb_helper_alloc_fbi(helper);
if (IS_ERR(fbi)) {
DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
ret = PTR_ERR(fbi);
goto fail_unlock;
DBG("fbi=%p, dev=%p", fbi, dev);
fbdev->fb = fb;
helper->fb = fb;
fbi->fbops = &msm_fb_ops;
drm_fb_helper_fill_info(fbi, helper, sizes);
dev->mode_config.fb_base = paddr;
fbi->screen_base = msm_gem_get_vaddr(bo);
if (IS_ERR(fbi->screen_base)) {
ret = PTR_ERR(fbi->screen_base);
goto fail_unlock;
fbi->screen_size = bo->size;
fbi->fix.smem_start = paddr;
fbi->fix.smem_len = bo->size;
DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
return 0;
return ret;
static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
.fb_probe = msm_fbdev_create,
/* initialize fbdev helper */
struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
struct msm_drm_private *priv = dev->dev_private;
struct msm_fbdev *fbdev = NULL;
struct drm_fb_helper *helper;
int ret;
fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
if (!fbdev)
goto fail;
helper = &fbdev->base;
drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
ret = drm_fb_helper_init(dev, helper);
if (ret) {
DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
goto fail;
/* the fw fb could be anywhere in memory */
ret = drm_aperture_remove_framebuffers(false, dev->driver);
if (ret)
goto fini;
ret = drm_fb_helper_initial_config(helper, 32);
if (ret)
goto fini;
priv->fbdev = helper;
return helper;
return NULL;
void msm_fbdev_free(struct drm_device *dev)
struct msm_drm_private *priv = dev->dev_private;
struct drm_fb_helper *helper = priv->fbdev;
struct msm_fbdev *fbdev;
fbdev = to_msm_fbdev(priv->fbdev);
/* this will free the backing object */
if (fbdev->fb) {
struct drm_gem_object *bo =
msm_framebuffer_bo(fbdev->fb, 0);
priv->fbdev = NULL;