/*
 * Copyright 2007-8 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 *
 * 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.
 *
 * Authors: Dave Airlie
 *          Alex Deucher
 */

#include <drm/drm_fixed.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_vblank.h>
#include <drm/radeon_drm.h>

#include "atom.h"
#include "radeon.h"

static void radeon_overscan_setup(struct drm_crtc *crtc,
				  struct drm_display_mode *mode)
{
	struct drm_device *dev = crtc->dev;
	struct radeon_device *rdev = dev->dev_private;
	struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);

	WREG32(RADEON_OVR_CLR + radeon_crtc->crtc_offset, 0);
	WREG32(RADEON_OVR_WID_LEFT_RIGHT + radeon_crtc->crtc_offset, 0);
	WREG32(RADEON_OVR_WID_TOP_BOTTOM + radeon_crtc->crtc_offset, 0);
}

static void radeon_legacy_rmx_mode_set(struct drm_crtc *crtc,
				       struct drm_display_mode *mode)
{
	struct drm_device *dev = crtc->dev;
	struct radeon_device *rdev = dev->dev_private;
	struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
	int xres = mode->hdisplay;
	int yres = mode->vdisplay;
	bool hscale = true, vscale = true;
	int hsync_wid;
	int vsync_wid;
	int hsync_start;
	int blank_width;
	u32 scale, inc, crtc_more_cntl;
	u32 fp_horz_stretch, fp_vert_stretch, fp_horz_vert_active;
	u32 fp_h_sync_strt_wid, fp_crtc_h_total_disp;
	u32 fp_v_sync_strt_wid, fp_crtc_v_total_disp;
	struct drm_display_mode *native_mode = &radeon_crtc->native_mode;

	fp_vert_stretch = RREG32(RADEON_FP_VERT_STRETCH) &
		(RADEON_VERT_STRETCH_RESERVED |
		 RADEON_VERT_AUTO_RATIO_INC);
	fp_horz_stretch = RREG32(RADEON_FP_HORZ_STRETCH) &
		(RADEON_HORZ_FP_LOOP_STRETCH |
		 RADEON_HORZ_AUTO_RATIO_INC);

	crtc_more_cntl = 0;
	if ((rdev->family == CHIP_RS100) ||
	    (rdev->family == CHIP_RS200)) {
		/* This is to workaround the asic bug for RMX, some versions
		   of BIOS dosen't have this register initialized correctly. */
		crtc_more_cntl |= RADEON_CRTC_H_CUTOFF_ACTIVE_EN;
	}


	fp_crtc_h_total_disp = ((((mode->crtc_htotal / 8) - 1) & 0x3ff)
				| ((((mode->crtc_hdisplay / 8) - 1) & 0x1ff) << 16));

	hsync_wid = (mode->crtc_hsync_end - mode->crtc_hsync_start) / 8;
	if (!hsync_wid)
		hsync_wid = 1;
	hsync_start = mode->crtc_hsync_start - 8;

	fp_h_sync_strt_wid = ((hsync_start & 0x1fff)
			      | ((hsync_wid & 0x3f) << 16)
			      | ((mode->flags & DRM_MODE_FLAG_NHSYNC)
				 ? RADEON_CRTC_H_SYNC_POL
				 : 0));

	fp_crtc_v_total_disp = (((mode->crtc_vtotal - 1) & 0xffff)
				| ((mode->crtc_vdisplay - 1) << 16));

	vsync_wid = mode->crtc_vsync_end - mode->crtc_vsync_start;
	if (!vsync_wid)
		vsync_wid = 1;

	fp_v_sync_strt_wid = (((mode->crtc_vsync_start - 1) & 0xfff)
			      | ((vsync_wid & 0x1f) << 16)
			      | ((mode->flags & DRM_MODE_FLAG_NVSYNC)
				 ? RADEON_CRTC_V_SYNC_POL
				 : 0));

	fp_horz_vert_active = 0;

	if (native_mode->hdisplay == 0 ||
	    native_mode->vdisplay == 0) {
		hscale = false;
		vscale = false;
	} else {
		if (xres > native_mode->hdisplay)
			xres = native_mode->hdisplay;
		if (yres > native_mode->vdisplay)
			yres = native_mode->vdisplay;

		if (xres == native_mode->hdisplay)
			hscale = false;
		if (yres == native_mode->vdisplay)
			vscale = false;
	}

	switch (radeon_crtc->rmx_type) {
	case RMX_FULL:
	case RMX_ASPECT:
		if (!hscale)
			fp_horz_stretch |= ((xres/8-1) << 16);
		else {
			inc = (fp_horz_stretch & RADEON_HORZ_AUTO_RATIO_INC) ? 1 : 0;
			scale = ((xres + inc) * RADEON_HORZ_STRETCH_RATIO_MAX)
				/ native_mode->hdisplay + 1;
			fp_horz_stretch |= (((scale) & RADEON_HORZ_STRETCH_RATIO_MASK) |
					RADEON_HORZ_STRETCH_BLEND |
					RADEON_HORZ_STRETCH_ENABLE |
					((native_mode->hdisplay/8-1) << 16));
		}

		if (!vscale)
			fp_vert_stretch |= ((yres-1) << 12);
		else {
			inc = (fp_vert_stretch & RADEON_VERT_AUTO_RATIO_INC) ? 1 : 0;
			scale = ((yres + inc) * RADEON_VERT_STRETCH_RATIO_MAX)
				/ native_mode->vdisplay + 1;
			fp_vert_stretch |= (((scale) & RADEON_VERT_STRETCH_RATIO_MASK) |
					RADEON_VERT_STRETCH_ENABLE |
					RADEON_VERT_STRETCH_BLEND |
					((native_mode->vdisplay-1) << 12));
		}
		break;
	case RMX_CENTER:
		fp_horz_stretch |= ((xres/8-1) << 16);
		fp_vert_stretch |= ((yres-1) << 12);

		crtc_more_cntl |= (RADEON_CRTC_AUTO_HORZ_CENTER_EN |
				RADEON_CRTC_AUTO_VERT_CENTER_EN);

		blank_width = (mode->crtc_hblank_end - mode->crtc_hblank_start) / 8;
		if (blank_width > 110)
			blank_width = 110;

		fp_crtc_h_total_disp = (((blank_width) & 0x3ff)
				| ((((mode->crtc_hdisplay / 8) - 1) & 0x1ff) << 16));

		hsync_wid = (mode->crtc_hsync_end - mode->crtc_hsync_start) / 8;
		if (!hsync_wid)
			hsync_wid = 1;

		fp_h_sync_strt_wid = ((((mode->crtc_hsync_start - mode->crtc_hblank_start) / 8) & 0x1fff)
				| ((hsync_wid & 0x3f) << 16)
				| ((mode->flags & DRM_MODE_FLAG_NHSYNC)
					? RADEON_CRTC_H_SYNC_POL
					: 0));

		fp_crtc_v_total_disp = (((mode->crtc_vblank_end - mode->crtc_vblank_start) & 0xffff)
				| ((mode->crtc_vdisplay - 1) << 16));

		vsync_wid = mode->crtc_vsync_end - mode->crtc_vsync_start;
		if (!vsync_wid)
			vsync_wid = 1;

		fp_v_sync_strt_wid = ((((mode->crtc_vsync_start - mode->crtc_vblank_start) & 0xfff)
					| ((vsync_wid & 0x1f) << 16)
					| ((mode->flags & DRM_MODE_FLAG_NVSYNC)
						? RADEON_CRTC_V_SYNC_POL
						: 0)));

		fp_horz_vert_active = (((native_mode->vdisplay) & 0xfff) |
				(((native_mode->hdisplay / 8) & 0x1ff) << 16));
		break;
	case RMX_OFF:
	default:
		fp_horz_stretch |= ((xres/8-1) << 16);
		fp_vert_stretch |= ((yres-1) << 12);
		break;
	}

	WREG32(RADEON_FP_HORZ_STRETCH,      fp_horz_stretch);
	WREG32(RADEON_FP_VERT_STRETCH,      fp_vert_stretch);
	WREG32(RADEON_CRTC_MORE_CNTL,       crtc_more_cntl);
	WREG32(RADEON_FP_HORZ_VERT_ACTIVE,  fp_horz_vert_active);
	WREG32(RADEON_FP_H_SYNC_STRT_WID,   fp_h_sync_strt_wid);
	WREG32(RADEON_FP_V_SYNC_STRT_WID,   fp_v_sync_strt_wid);
	WREG32(RADEON_FP_CRTC_H_TOTAL_DISP, fp_crtc_h_total_disp);
	WREG32(RADEON_FP_CRTC_V_TOTAL_DISP, fp_crtc_v_total_disp);
}

static void radeon_pll_wait_for_read_update_complete(struct drm_device *dev)
{
	struct radeon_device *rdev = dev->dev_private;
	int i = 0;

	/* FIXME: Certain revisions of R300 can't recover here.  Not sure of
	   the cause yet, but this workaround will mask the problem for now.
	   Other chips usually will pass at the very first test, so the
	   workaround shouldn't have any effect on them. */
	for (i = 0;
	     (i < 10000 &&
	      RREG32_PLL(RADEON_PPLL_REF_DIV) & RADEON_PPLL_ATOMIC_UPDATE_R);
	     i++);
}

static void radeon_pll_write_update(struct drm_device *dev)
{
	struct radeon_device *rdev = dev->dev_private;

	while (RREG32_PLL(RADEON_PPLL_REF_DIV) & RADEON_PPLL_ATOMIC_UPDATE_R);

	WREG32_PLL_P(RADEON_PPLL_REF_DIV,
			   RADEON_PPLL_ATOMIC_UPDATE_W,
			   ~(RADEON_PPLL_ATOMIC_UPDATE_W));
}

static void radeon_pll2_wait_for_read_update_complete(struct drm_device *dev)
{
	struct radeon_device *rdev = dev->dev_private;
	int i = 0;


	/* FIXME: Certain revisions of R300 can't recover here.  Not sure of
	   the cause yet, but this workaround will mask the problem for now.
	   Other chips usually will pass at the very first test, so the
	   workaround shouldn't have any effect on them. */
	for (i = 0;
	     (i < 10000 &&
	      RREG32_PLL(RADEON_P2PLL_REF_DIV) & RADEON_P2PLL_ATOMIC_UPDATE_R);
	     i++);
}

static void radeon_pll2_write_update(struct drm_device *dev)
{
	struct radeon_device *rdev = dev->dev_private;

	while (RREG32_PLL(RADEON_P2PLL_REF_DIV) & RADEON_P2PLL_ATOMIC_UPDATE_R);

	WREG32_PLL_P(RADEON_P2PLL_REF_DIV,
			   RADEON_P2PLL_ATOMIC_UPDATE_W,
			   ~(RADEON_P2PLL_ATOMIC_UPDATE_W));
}

static uint8_t radeon_compute_pll_gain(uint16_t ref_freq, uint16_t ref_div,
				       uint16_t fb_div)
{
	unsigned int vcoFreq;

	if (!ref_div)
		return 1;

	vcoFreq = ((unsigned)ref_freq * fb_div) / ref_div;

	/*
	 * This is horribly crude: the VCO frequency range is divided into
	 * 3 parts, each part having a fixed PLL gain value.
	 */
	if (vcoFreq >= 30000)
		/*
		 * [300..max] MHz : 7
		 */
		return 7;
	else if (vcoFreq >= 18000)
		/*
		 * [180..300) MHz : 4
		 */
		return 4;
	else
		/*
		 * [0..180) MHz : 1
		 */
		return 1;
}

static void radeon_crtc_dpms(struct drm_crtc *crtc, int mode)
{
	struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
	struct drm_device *dev = crtc->dev;
	struct radeon_device *rdev = dev->dev_private;
	uint32_t crtc_ext_cntl = 0;
	uint32_t mask;

	if (radeon_crtc->crtc_id)
		mask = (RADEON_CRTC2_DISP_DIS |
			RADEON_CRTC2_VSYNC_DIS |
			RADEON_CRTC2_HSYNC_DIS |
			RADEON_CRTC2_DISP_REQ_EN_B);
	else
		mask = (RADEON_CRTC_DISPLAY_DIS |
			RADEON_CRTC_VSYNC_DIS |
			RADEON_CRTC_HSYNC_DIS);

	/*
	 * On all dual CRTC GPUs this bit controls the CRTC of the primary DAC.
	 * Therefore it is set in the DAC DMPS function.
	 * This is different for GPU's with a single CRTC but a primary and a
	 * TV DAC: here it controls the single CRTC no matter where it is
	 * routed. Therefore we set it here.
	 */
	if (rdev->flags & RADEON_SINGLE_CRTC)
		crtc_ext_cntl = RADEON_CRTC_CRT_ON;

	switch (mode) {
	case DRM_MODE_DPMS_ON:
		radeon_crtc->enabled = true;
		/* adjust pm to dpms changes BEFORE enabling crtcs */
		radeon_pm_compute_clocks(rdev);
		if (radeon_crtc->crtc_id)
			WREG32_P(RADEON_CRTC2_GEN_CNTL, RADEON_CRTC2_EN, ~(RADEON_CRTC2_EN | mask));
		else {
			WREG32_P(RADEON_CRTC_GEN_CNTL, RADEON_CRTC_EN, ~(RADEON_CRTC_EN |
									 RADEON_CRTC_DISP_REQ_EN_B));
			WREG32_P(RADEON_CRTC_EXT_CNTL, crtc_ext_cntl, ~(mask | crtc_ext_cntl));
		}
		if (dev->num_crtcs > radeon_crtc->crtc_id)
			drm_crtc_vblank_on(crtc);
		radeon_crtc_load_lut(crtc);
		break;
	case DRM_MODE_DPMS_STANDBY:
	case DRM_MODE_DPMS_SUSPEND:
	case DRM_MODE_DPMS_OFF:
		if (dev->num_crtcs > radeon_crtc->crtc_id)
			drm_crtc_vblank_off(crtc);
		if (radeon_crtc->crtc_id)
			WREG32_P(RADEON_CRTC2_GEN_CNTL, mask, ~(RADEON_CRTC2_EN | mask));
		else {
			WREG32_P(RADEON_CRTC_GEN_CNTL, RADEON_CRTC_DISP_REQ_EN_B, ~(RADEON_CRTC_EN |
										    RADEON_CRTC_DISP_REQ_EN_B));
			WREG32_P(RADEON_CRTC_EXT_CNTL, mask, ~(mask | crtc_ext_cntl));
		}
		radeon_crtc->enabled = false;
		/* adjust pm to dpms changes AFTER disabling crtcs */
		radeon_pm_compute_clocks(rdev);
		break;
	}
}

int radeon_crtc_set_base(struct drm_crtc *crtc, int x, int y,
			 struct drm_framebuffer *old_fb)
{
	return radeon_crtc_do_set_base(crtc, old_fb, x, y, 0);
}

int radeon_crtc_set_base_atomic(struct drm_crtc *crtc,
				struct drm_framebuffer *fb,
				int x, int y, enum mode_set_atomic state)
{
	return radeon_crtc_do_set_base(crtc, fb, x, y, 1);
}

int radeon_crtc_do_set_base(struct drm_crtc *crtc,
			 struct drm_framebuffer *fb,
			 int x, int y, int atomic)
{
	struct drm_device *dev = crtc->dev;
	struct radeon_device *rdev = dev->dev_private;
	struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
	struct drm_framebuffer *target_fb;
	struct drm_gem_object *obj;
	struct radeon_bo *rbo;
	uint64_t base;
	uint32_t crtc_offset, crtc_offset_cntl, crtc_tile_x0_y0 = 0;
	uint32_t crtc_pitch, pitch_pixels;
	uint32_t tiling_flags;
	int format;
	uint32_t gen_cntl_reg, gen_cntl_val;
	int r;

	DRM_DEBUG_KMS("\n");
	/* no fb bound */
	if (!atomic && !crtc->primary->fb) {
		DRM_DEBUG_KMS("No FB bound\n");
		return 0;
	}

	if (atomic)
		target_fb = fb;
	else
		target_fb = crtc->primary->fb;

	switch (target_fb->format->cpp[0] * 8) {
	case 8:
		format = 2;
		break;
	case 15:      /*  555 */
		format = 3;
		break;
	case 16:      /*  565 */
		format = 4;
		break;
	case 24:      /*  RGB */
		format = 5;
		break;
	case 32:      /* xRGB */
		format = 6;
		break;
	default:
		return false;
	}

	/* Pin framebuffer & get tilling informations */
	obj = target_fb->obj[0];
	rbo = gem_to_radeon_bo(obj);
retry:
	r = radeon_bo_reserve(rbo, false);
	if (unlikely(r != 0))
		return r;
	/* Only 27 bit offset for legacy CRTC */
	r = radeon_bo_pin_restricted(rbo, RADEON_GEM_DOMAIN_VRAM, 1 << 27,
				     &base);
	if (unlikely(r != 0)) {
		radeon_bo_unreserve(rbo);

		/* On old GPU like RN50 with little vram pining can fails because
		 * current fb is taking all space needed. So instead of unpining
		 * the old buffer after pining the new one, first unpin old one
		 * and then retry pining new one.
		 *
		 * As only master can set mode only master can pin and it is
		 * unlikely the master client will race with itself especialy
		 * on those old gpu with single crtc.
		 *
		 * We don't shutdown the display controller because new buffer
		 * will end up in same spot.
		 */
		if (!atomic && fb && fb != crtc->primary->fb) {
			struct radeon_bo *old_rbo;
			unsigned long nsize, osize;

			old_rbo = gem_to_radeon_bo(fb->obj[0]);
			osize = radeon_bo_size(old_rbo);
			nsize = radeon_bo_size(rbo);
			if (nsize <= osize && !radeon_bo_reserve(old_rbo, false)) {
				radeon_bo_unpin(old_rbo);
				radeon_bo_unreserve(old_rbo);
				fb = NULL;
				goto retry;
			}
		}
		return -EINVAL;
	}
	radeon_bo_get_tiling_flags(rbo, &tiling_flags, NULL);
	radeon_bo_unreserve(rbo);
	if (tiling_flags & RADEON_TILING_MICRO)
		DRM_ERROR("trying to scanout microtiled buffer\n");

	/* if scanout was in GTT this really wouldn't work */
	/* crtc offset is from display base addr not FB location */
	radeon_crtc->legacy_display_base_addr = rdev->mc.vram_start;

	base -= radeon_crtc->legacy_display_base_addr;

	crtc_offset_cntl = 0;

	pitch_pixels = target_fb->pitches[0] / target_fb->format->cpp[0];
	crtc_pitch = DIV_ROUND_UP(pitch_pixels * target_fb->format->cpp[0] * 8,
				  target_fb->format->cpp[0] * 8 * 8);
	crtc_pitch |= crtc_pitch << 16;

	crtc_offset_cntl |= RADEON_CRTC_GUI_TRIG_OFFSET_LEFT_EN;
	if (tiling_flags & RADEON_TILING_MACRO) {
		if (ASIC_IS_R300(rdev))
			crtc_offset_cntl |= (R300_CRTC_X_Y_MODE_EN |
					     R300_CRTC_MICRO_TILE_BUFFER_DIS |
					     R300_CRTC_MACRO_TILE_EN);
		else
			crtc_offset_cntl |= RADEON_CRTC_TILE_EN;
	} else {
		if (ASIC_IS_R300(rdev))
			crtc_offset_cntl &= ~(R300_CRTC_X_Y_MODE_EN |
					      R300_CRTC_MICRO_TILE_BUFFER_DIS |
					      R300_CRTC_MACRO_TILE_EN);
		else
			crtc_offset_cntl &= ~RADEON_CRTC_TILE_EN;
	}

	if (tiling_flags & RADEON_TILING_MACRO) {
		if (ASIC_IS_R300(rdev)) {
			crtc_tile_x0_y0 = x | (y << 16);
			base &= ~0x7ff;
		} else {
			int byteshift = target_fb->format->cpp[0] * 8 >> 4;
			int tile_addr = (((y >> 3) * pitch_pixels +  x) >> (8 - byteshift)) << 11;
			base += tile_addr + ((x << byteshift) % 256) + ((y % 8) << 8);
			crtc_offset_cntl |= (y % 16);
		}
	} else {
		int offset = y * pitch_pixels + x;
		switch (target_fb->format->cpp[0] * 8) {
		case 8:
			offset *= 1;
			break;
		case 15:
		case 16:
			offset *= 2;
			break;
		case 24:
			offset *= 3;
			break;
		case 32:
			offset *= 4;
			break;
		default:
			return false;
		}
		base += offset;
	}

	base &= ~7;

	if (radeon_crtc->crtc_id == 1)
		gen_cntl_reg = RADEON_CRTC2_GEN_CNTL;
	else
		gen_cntl_reg = RADEON_CRTC_GEN_CNTL;

	gen_cntl_val = RREG32(gen_cntl_reg);
	gen_cntl_val &= ~(0xf << 8);
	gen_cntl_val |= (format << 8);
	gen_cntl_val &= ~RADEON_CRTC_VSTAT_MODE_MASK;
	WREG32(gen_cntl_reg, gen_cntl_val);

	crtc_offset = (u32)base;

	WREG32(RADEON_DISPLAY_BASE_ADDR + radeon_crtc->crtc_offset, radeon_crtc->legacy_display_base_addr);

	if (ASIC_IS_R300(rdev)) {
		if (radeon_crtc->crtc_id)
			WREG32(R300_CRTC2_TILE_X0_Y0, crtc_tile_x0_y0);
		else
			WREG32(R300_CRTC_TILE_X0_Y0, crtc_tile_x0_y0);
	}
	WREG32(RADEON_CRTC_OFFSET_CNTL + radeon_crtc->crtc_offset, crtc_offset_cntl);
	WREG32(RADEON_CRTC_OFFSET + radeon_crtc->crtc_offset, crtc_offset);
	WREG32(RADEON_CRTC_PITCH + radeon_crtc->crtc_offset, crtc_pitch);

	if (!atomic && fb && fb != crtc->primary->fb) {
		rbo = gem_to_radeon_bo(fb->obj[0]);
		r = radeon_bo_reserve(rbo, false);
		if (unlikely(r != 0))
			return r;
		radeon_bo_unpin(rbo);
		radeon_bo_unreserve(rbo);
	}

	/* Bytes per pixel may have changed */
	radeon_bandwidth_update(rdev);

	return 0;
}

static bool radeon_set_crtc_timing(struct drm_crtc *crtc, struct drm_display_mode *mode)
{
	struct drm_device *dev = crtc->dev;
	struct radeon_device *rdev = dev->dev_private;
	struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
	const struct drm_framebuffer *fb = crtc->primary->fb;
	struct drm_encoder *encoder;
	int format;
	int hsync_start;
	int hsync_wid;
	int vsync_wid;
	uint32_t crtc_h_total_disp;
	uint32_t crtc_h_sync_strt_wid;
	uint32_t crtc_v_total_disp;
	uint32_t crtc_v_sync_strt_wid;
	bool is_tv = false;

	DRM_DEBUG_KMS("\n");
	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
		if (encoder->crtc == crtc) {
			struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
			if (radeon_encoder->active_device & ATOM_DEVICE_TV_SUPPORT) {
				is_tv = true;
				DRM_INFO("crtc %d is connected to a TV\n", radeon_crtc->crtc_id);
				break;
			}
		}
	}

	switch (fb->format->cpp[0] * 8) {
	case 8:
		format = 2;
		break;
	case 15:      /*  555 */
		format = 3;
		break;
	case 16:      /*  565 */
		format = 4;
		break;
	case 24:      /*  RGB */
		format = 5;
		break;
	case 32:      /* xRGB */
		format = 6;
		break;
	default:
		return false;
	}

	crtc_h_total_disp = ((((mode->crtc_htotal / 8) - 1) & 0x3ff)
			     | ((((mode->crtc_hdisplay / 8) - 1) & 0x1ff) << 16));

	hsync_wid = (mode->crtc_hsync_end - mode->crtc_hsync_start) / 8;
	if (!hsync_wid)
		hsync_wid = 1;
	hsync_start = mode->crtc_hsync_start - 8;

	crtc_h_sync_strt_wid = ((hsync_start & 0x1fff)
				| ((hsync_wid & 0x3f) << 16)
				| ((mode->flags & DRM_MODE_FLAG_NHSYNC)
				   ? RADEON_CRTC_H_SYNC_POL
				   : 0));

	/* This works for double scan mode. */
	crtc_v_total_disp = (((mode->crtc_vtotal - 1) & 0xffff)
			     | ((mode->crtc_vdisplay - 1) << 16));

	vsync_wid = mode->crtc_vsync_end - mode->crtc_vsync_start;
	if (!vsync_wid)
		vsync_wid = 1;

	crtc_v_sync_strt_wid = (((mode->crtc_vsync_start - 1) & 0xfff)
				| ((vsync_wid & 0x1f) << 16)
				| ((mode->flags & DRM_MODE_FLAG_NVSYNC)
				   ? RADEON_CRTC_V_SYNC_POL
				   : 0));

	if (radeon_crtc->crtc_id) {
		uint32_t crtc2_gen_cntl;
		uint32_t disp2_merge_cntl;

		/* if TV DAC is enabled for another crtc and keep it enabled */
		crtc2_gen_cntl = RREG32(RADEON_CRTC2_GEN_CNTL) & 0x00718080;
		crtc2_gen_cntl |= ((format << 8)
				   | RADEON_CRTC2_VSYNC_DIS
				   | RADEON_CRTC2_HSYNC_DIS
				   | RADEON_CRTC2_DISP_DIS
				   | RADEON_CRTC2_DISP_REQ_EN_B
				   | ((mode->flags & DRM_MODE_FLAG_DBLSCAN)
				      ? RADEON_CRTC2_DBL_SCAN_EN
				      : 0)
				   | ((mode->flags & DRM_MODE_FLAG_CSYNC)
				      ? RADEON_CRTC2_CSYNC_EN
				      : 0)
				   | ((mode->flags & DRM_MODE_FLAG_INTERLACE)
				      ? RADEON_CRTC2_INTERLACE_EN
				      : 0));

		/* rs4xx chips seem to like to have the crtc enabled when the timing is set */
		if ((rdev->family == CHIP_RS400) || (rdev->family == CHIP_RS480))
			crtc2_gen_cntl |= RADEON_CRTC2_EN;

		disp2_merge_cntl = RREG32(RADEON_DISP2_MERGE_CNTL);
		disp2_merge_cntl &= ~RADEON_DISP2_RGB_OFFSET_EN;

		WREG32(RADEON_DISP2_MERGE_CNTL, disp2_merge_cntl);
		WREG32(RADEON_CRTC2_GEN_CNTL, crtc2_gen_cntl);

		WREG32(RADEON_FP_H2_SYNC_STRT_WID, crtc_h_sync_strt_wid);
		WREG32(RADEON_FP_V2_SYNC_STRT_WID, crtc_v_sync_strt_wid);
	} else {
		uint32_t crtc_gen_cntl;
		uint32_t crtc_ext_cntl;
		uint32_t disp_merge_cntl;

		crtc_gen_cntl = RREG32(RADEON_CRTC_GEN_CNTL) & 0x00718000;
		crtc_gen_cntl |= (RADEON_CRTC_EXT_DISP_EN
				 | (format << 8)
				 | RADEON_CRTC_DISP_REQ_EN_B
				 | ((mode->flags & DRM_MODE_FLAG_DBLSCAN)
				    ? RADEON_CRTC_DBL_SCAN_EN
				    : 0)
				 | ((mode->flags & DRM_MODE_FLAG_CSYNC)
				    ? RADEON_CRTC_CSYNC_EN
				    : 0)
				 | ((mode->flags & DRM_MODE_FLAG_INTERLACE)
				    ? RADEON_CRTC_INTERLACE_EN
				    : 0));

		/* rs4xx chips seem to like to have the crtc enabled when the timing is set */
		if ((rdev->family == CHIP_RS400) || (rdev->family == CHIP_RS480))
			crtc_gen_cntl |= RADEON_CRTC_EN;

		crtc_ext_cntl = RREG32(RADEON_CRTC_EXT_CNTL);
		crtc_ext_cntl |= (RADEON_XCRT_CNT_EN |
				  RADEON_CRTC_VSYNC_DIS |
				  RADEON_CRTC_HSYNC_DIS |
				  RADEON_CRTC_DISPLAY_DIS);

		disp_merge_cntl = RREG32(RADEON_DISP_MERGE_CNTL);
		disp_merge_cntl &= ~RADEON_DISP_RGB_OFFSET_EN;

		WREG32(RADEON_DISP_MERGE_CNTL, disp_merge_cntl);
		WREG32(RADEON_CRTC_GEN_CNTL, crtc_gen_cntl);
		WREG32(RADEON_CRTC_EXT_CNTL, crtc_ext_cntl);
	}

	if (is_tv)
		radeon_legacy_tv_adjust_crtc_reg(encoder, &crtc_h_total_disp,
						 &crtc_h_sync_strt_wid, &crtc_v_total_disp,
						 &crtc_v_sync_strt_wid);

	WREG32(RADEON_CRTC_H_TOTAL_DISP + radeon_crtc->crtc_offset, crtc_h_total_disp);
	WREG32(RADEON_CRTC_H_SYNC_STRT_WID + radeon_crtc->crtc_offset, crtc_h_sync_strt_wid);
	WREG32(RADEON_CRTC_V_TOTAL_DISP + radeon_crtc->crtc_offset, crtc_v_total_disp);
	WREG32(RADEON_CRTC_V_SYNC_STRT_WID + radeon_crtc->crtc_offset, crtc_v_sync_strt_wid);

	return true;
}

static void radeon_set_pll(struct drm_crtc *crtc, struct drm_display_mode *mode)
{
	struct drm_device *dev = crtc->dev;
	struct radeon_device *rdev = dev->dev_private;
	struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);
	struct drm_encoder *encoder;
	uint32_t feedback_div = 0;
	uint32_t frac_fb_div = 0;
	uint32_t reference_div = 0;
	uint32_t post_divider = 0;
	uint32_t freq = 0;
	uint8_t pll_gain;
	bool use_bios_divs = false;
	/* PLL registers */
	uint32_t pll_ref_div = 0;
	uint32_t pll_fb_post_div = 0;
	uint32_t htotal_cntl = 0;
	bool is_tv = false;
	struct radeon_pll *pll;

	struct {
		int divider;
		int bitvalue;
	} *post_div, post_divs[]   = {
		/* From RAGE 128 VR/RAGE 128 GL Register
		 * Reference Manual (Technical Reference
		 * Manual P/N RRG-G04100-C Rev. 0.04), page
		 * 3-17 (PLL_DIV_[3:0]).
		 */
		{  1, 0 },              /* VCLK_SRC                 */
		{  2, 1 },              /* VCLK_SRC/2               */
		{  4, 2 },              /* VCLK_SRC/4               */
		{  8, 3 },              /* VCLK_SRC/8               */
		{  3, 4 },              /* VCLK_SRC/3               */
		{ 16, 5 },              /* VCLK_SRC/16              */
		{  6, 6 },              /* VCLK_SRC/6               */
		{ 12, 7 },              /* VCLK_SRC/12              */
		{  0, 0 }
	};

	if (radeon_crtc->crtc_id)
		pll = &rdev->clock.p2pll;
	else
		pll = &rdev->clock.p1pll;

	pll->flags = RADEON_PLL_LEGACY;

	if (mode->clock > 200000) /* range limits??? */
		pll->flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
	else
		pll->flags |= RADEON_PLL_PREFER_LOW_REF_DIV;

	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
		if (encoder->crtc == crtc) {
			struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);

			if (radeon_encoder->active_device & ATOM_DEVICE_TV_SUPPORT) {
				is_tv = true;
				break;
			}

			if (encoder->encoder_type != DRM_MODE_ENCODER_DAC)
				pll->flags |= RADEON_PLL_NO_ODD_POST_DIV;
			if (encoder->encoder_type == DRM_MODE_ENCODER_LVDS) {
				if (!rdev->is_atom_bios) {
					struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
					struct radeon_encoder_lvds *lvds = (struct radeon_encoder_lvds *)radeon_encoder->enc_priv;
					if (lvds) {
						if (lvds->use_bios_dividers) {
							pll_ref_div = lvds->panel_ref_divider;
							pll_fb_post_div   = (lvds->panel_fb_divider |
									     (lvds->panel_post_divider << 16));
							htotal_cntl  = 0;
							use_bios_divs = true;
						}
					}
				}
				pll->flags |= RADEON_PLL_USE_REF_DIV;
			}
		}
	}

	DRM_DEBUG_KMS("\n");

	if (!use_bios_divs) {
		radeon_compute_pll_legacy(pll, mode->clock,
					  &freq, &feedback_div, &frac_fb_div,
					  &reference_div, &post_divider);

		for (post_div = &post_divs[0]; post_div->divider; ++post_div) {
			if (post_div->divider == post_divider)
				break;
		}

		if (!post_div->divider)
			post_div = &post_divs[0];

		DRM_DEBUG_KMS("dc=%u, fd=%d, rd=%d, pd=%d\n",
			  (unsigned)freq,
			  feedback_div,
			  reference_div,
			  post_divider);

		pll_ref_div   = reference_div;
#if defined(__powerpc__) && (0) /* TODO */
		/* apparently programming this otherwise causes a hang??? */
		if (info->MacModel == RADEON_MAC_IBOOK)
			pll_fb_post_div = 0x000600ad;
		else
#endif
			pll_fb_post_div     = (feedback_div | (post_div->bitvalue << 16));

		htotal_cntl    = mode->htotal & 0x7;

	}

	pll_gain = radeon_compute_pll_gain(pll->reference_freq,
					   pll_ref_div & 0x3ff,
					   pll_fb_post_div & 0x7ff);

	if (radeon_crtc->crtc_id) {
		uint32_t pixclks_cntl = ((RREG32_PLL(RADEON_PIXCLKS_CNTL) &
					  ~(RADEON_PIX2CLK_SRC_SEL_MASK)) |
					 RADEON_PIX2CLK_SRC_SEL_P2PLLCLK);

		if (is_tv) {
			radeon_legacy_tv_adjust_pll2(encoder, &htotal_cntl,
						     &pll_ref_div, &pll_fb_post_div,
						     &pixclks_cntl);
		}

		WREG32_PLL_P(RADEON_PIXCLKS_CNTL,
			     RADEON_PIX2CLK_SRC_SEL_CPUCLK,
			     ~(RADEON_PIX2CLK_SRC_SEL_MASK));

		WREG32_PLL_P(RADEON_P2PLL_CNTL,
			     RADEON_P2PLL_RESET
			     | RADEON_P2PLL_ATOMIC_UPDATE_EN
			     | ((uint32_t)pll_gain << RADEON_P2PLL_PVG_SHIFT),
			     ~(RADEON_P2PLL_RESET
			       | RADEON_P2PLL_ATOMIC_UPDATE_EN
			       | RADEON_P2PLL_PVG_MASK));

		WREG32_PLL_P(RADEON_P2PLL_REF_DIV,
			     pll_ref_div,
			     ~RADEON_P2PLL_REF_DIV_MASK);

		WREG32_PLL_P(RADEON_P2PLL_DIV_0,
			     pll_fb_post_div,
			     ~RADEON_P2PLL_FB0_DIV_MASK);

		WREG32_PLL_P(RADEON_P2PLL_DIV_0,
			     pll_fb_post_div,
			     ~RADEON_P2PLL_POST0_DIV_MASK);

		radeon_pll2_write_update(dev);
		radeon_pll2_wait_for_read_update_complete(dev);

		WREG32_PLL(RADEON_HTOTAL2_CNTL, htotal_cntl);

		WREG32_PLL_P(RADEON_P2PLL_CNTL,
			     0,
			     ~(RADEON_P2PLL_RESET
			       | RADEON_P2PLL_SLEEP
			       | RADEON_P2PLL_ATOMIC_UPDATE_EN));

		DRM_DEBUG_KMS("Wrote2: 0x%08x 0x%08x 0x%08x (0x%08x)\n",
			  (unsigned)pll_ref_div,
			  (unsigned)pll_fb_post_div,
			  (unsigned)htotal_cntl,
			  RREG32_PLL(RADEON_P2PLL_CNTL));
		DRM_DEBUG_KMS("Wrote2: rd=%u, fd=%u, pd=%u\n",
			  (unsigned)pll_ref_div & RADEON_P2PLL_REF_DIV_MASK,
			  (unsigned)pll_fb_post_div & RADEON_P2PLL_FB0_DIV_MASK,
			  (unsigned)((pll_fb_post_div &
				      RADEON_P2PLL_POST0_DIV_MASK) >> 16));

		mdelay(50); /* Let the clock to lock */

		WREG32_PLL_P(RADEON_PIXCLKS_CNTL,
			     RADEON_PIX2CLK_SRC_SEL_P2PLLCLK,
			     ~(RADEON_PIX2CLK_SRC_SEL_MASK));

		WREG32_PLL(RADEON_PIXCLKS_CNTL, pixclks_cntl);
	} else {
		uint32_t pixclks_cntl;


		if (is_tv) {
			pixclks_cntl = RREG32_PLL(RADEON_PIXCLKS_CNTL);
			radeon_legacy_tv_adjust_pll1(encoder, &htotal_cntl, &pll_ref_div,
						     &pll_fb_post_div, &pixclks_cntl);
		}

		if (rdev->flags & RADEON_IS_MOBILITY) {
			/* A temporal workaround for the occasional blanking on certain laptop panels.
			   This appears to related to the PLL divider registers (fail to lock?).
			   It occurs even when all dividers are the same with their old settings.
			   In this case we really don't need to fiddle with PLL registers.
			   By doing this we can avoid the blanking problem with some panels.
			*/
			if ((pll_ref_div == (RREG32_PLL(RADEON_PPLL_REF_DIV) & RADEON_PPLL_REF_DIV_MASK)) &&
			    (pll_fb_post_div == (RREG32_PLL(RADEON_PPLL_DIV_3) &
						 (RADEON_PPLL_POST3_DIV_MASK | RADEON_PPLL_FB3_DIV_MASK)))) {
				WREG32_P(RADEON_CLOCK_CNTL_INDEX,
					 RADEON_PLL_DIV_SEL,
					 ~(RADEON_PLL_DIV_SEL));
				r100_pll_errata_after_index(rdev);
				return;
			}
		}

		WREG32_PLL_P(RADEON_VCLK_ECP_CNTL,
			     RADEON_VCLK_SRC_SEL_CPUCLK,
			     ~(RADEON_VCLK_SRC_SEL_MASK));
		WREG32_PLL_P(RADEON_PPLL_CNTL,
			     RADEON_PPLL_RESET
			     | RADEON_PPLL_ATOMIC_UPDATE_EN
			     | RADEON_PPLL_VGA_ATOMIC_UPDATE_EN
			     | ((uint32_t)pll_gain << RADEON_PPLL_PVG_SHIFT),
			     ~(RADEON_PPLL_RESET
			       | RADEON_PPLL_ATOMIC_UPDATE_EN
			       | RADEON_PPLL_VGA_ATOMIC_UPDATE_EN
			       | RADEON_PPLL_PVG_MASK));

		WREG32_P(RADEON_CLOCK_CNTL_INDEX,
			 RADEON_PLL_DIV_SEL,
			 ~(RADEON_PLL_DIV_SEL));
		r100_pll_errata_after_index(rdev);

		if (ASIC_IS_R300(rdev) ||
		    (rdev->family == CHIP_RS300) ||
		    (rdev->family == CHIP_RS400) ||
		    (rdev->family == CHIP_RS480)) {
			if (pll_ref_div & R300_PPLL_REF_DIV_ACC_MASK) {
				/* When restoring console mode, use saved PPLL_REF_DIV
				 * setting.
				 */
				WREG32_PLL_P(RADEON_PPLL_REF_DIV,
					     pll_ref_div,
					     0);
			} else {
				/* R300 uses ref_div_acc field as real ref divider */
				WREG32_PLL_P(RADEON_PPLL_REF_DIV,
					     (pll_ref_div << R300_PPLL_REF_DIV_ACC_SHIFT),
					     ~R300_PPLL_REF_DIV_ACC_MASK);
			}
		} else
			WREG32_PLL_P(RADEON_PPLL_REF_DIV,
				     pll_ref_div,
				     ~RADEON_PPLL_REF_DIV_MASK);

		WREG32_PLL_P(RADEON_PPLL_DIV_3,
			     pll_fb_post_div,
			     ~RADEON_PPLL_FB3_DIV_MASK);

		WREG32_PLL_P(RADEON_PPLL_DIV_3,
			     pll_fb_post_div,
			     ~RADEON_PPLL_POST3_DIV_MASK);

		radeon_pll_write_update(dev);
		radeon_pll_wait_for_read_update_complete(dev);

		WREG32_PLL(RADEON_HTOTAL_CNTL, htotal_cntl);

		WREG32_PLL_P(RADEON_PPLL_CNTL,
			     0,
			     ~(RADEON_PPLL_RESET
			       | RADEON_PPLL_SLEEP
			       | RADEON_PPLL_ATOMIC_UPDATE_EN
			       | RADEON_PPLL_VGA_ATOMIC_UPDATE_EN));

		DRM_DEBUG_KMS("Wrote: 0x%08x 0x%08x 0x%08x (0x%08x)\n",
			  pll_ref_div,
			  pll_fb_post_div,
			  (unsigned)htotal_cntl,
			  RREG32_PLL(RADEON_PPLL_CNTL));
		DRM_DEBUG_KMS("Wrote: rd=%d, fd=%d, pd=%d\n",
			  pll_ref_div & RADEON_PPLL_REF_DIV_MASK,
			  pll_fb_post_div & RADEON_PPLL_FB3_DIV_MASK,
			  (pll_fb_post_div & RADEON_PPLL_POST3_DIV_MASK) >> 16);

		mdelay(50); /* Let the clock to lock */

		WREG32_PLL_P(RADEON_VCLK_ECP_CNTL,
			     RADEON_VCLK_SRC_SEL_PPLLCLK,
			     ~(RADEON_VCLK_SRC_SEL_MASK));

		if (is_tv)
			WREG32_PLL(RADEON_PIXCLKS_CNTL, pixclks_cntl);
	}
}

static bool radeon_crtc_mode_fixup(struct drm_crtc *crtc,
				   const struct drm_display_mode *mode,
				   struct drm_display_mode *adjusted_mode)
{
	if (!radeon_crtc_scaling_mode_fixup(crtc, mode, adjusted_mode))
		return false;
	return true;
}

static int radeon_crtc_mode_set(struct drm_crtc *crtc,
				 struct drm_display_mode *mode,
				 struct drm_display_mode *adjusted_mode,
				 int x, int y, struct drm_framebuffer *old_fb)
{
	struct radeon_crtc *radeon_crtc = to_radeon_crtc(crtc);

	/* TODO TV */
	radeon_crtc_set_base(crtc, x, y, old_fb);
	radeon_set_crtc_timing(crtc, adjusted_mode);
	radeon_set_pll(crtc, adjusted_mode);
	radeon_overscan_setup(crtc, adjusted_mode);
	if (radeon_crtc->crtc_id == 0) {
		radeon_legacy_rmx_mode_set(crtc, adjusted_mode);
	} else {
		if (radeon_crtc->rmx_type != RMX_OFF) {
			/* FIXME: only first crtc has rmx what should we
			 * do ?
			 */
			DRM_ERROR("Mode need scaling but only first crtc can do that.\n");
		}
	}
	radeon_cursor_reset(crtc);
	return 0;
}

static void radeon_crtc_prepare(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_crtc *crtci;

	/*
	* The hardware wedges sometimes if you reconfigure one CRTC
	* whilst another is running (see fdo bug #24611).
	*/
	list_for_each_entry(crtci, &dev->mode_config.crtc_list, head)
		radeon_crtc_dpms(crtci, DRM_MODE_DPMS_OFF);
}

static void radeon_crtc_commit(struct drm_crtc *crtc)
{
	struct drm_device *dev = crtc->dev;
	struct drm_crtc *crtci;

	/*
	* Reenable the CRTCs that should be running.
	*/
	list_for_each_entry(crtci, &dev->mode_config.crtc_list, head) {
		if (crtci->enabled)
			radeon_crtc_dpms(crtci, DRM_MODE_DPMS_ON);
	}
}

static void radeon_crtc_disable(struct drm_crtc *crtc)
{
	radeon_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
	if (crtc->primary->fb) {
		int r;
		struct radeon_bo *rbo;

		rbo = gem_to_radeon_bo(crtc->primary->fb->obj[0]);
		r = radeon_bo_reserve(rbo, false);
		if (unlikely(r))
			DRM_ERROR("failed to reserve rbo before unpin\n");
		else {
			radeon_bo_unpin(rbo);
			radeon_bo_unreserve(rbo);
		}
	}
}

static const struct drm_crtc_helper_funcs legacy_helper_funcs = {
	.dpms = radeon_crtc_dpms,
	.mode_fixup = radeon_crtc_mode_fixup,
	.mode_set = radeon_crtc_mode_set,
	.mode_set_base = radeon_crtc_set_base,
	.mode_set_base_atomic = radeon_crtc_set_base_atomic,
	.prepare = radeon_crtc_prepare,
	.commit = radeon_crtc_commit,
	.disable = radeon_crtc_disable,
	.get_scanout_position = radeon_get_crtc_scanout_position,
};


void radeon_legacy_init_crtc(struct drm_device *dev,
			       struct radeon_crtc *radeon_crtc)
{
	if (radeon_crtc->crtc_id == 1)
		radeon_crtc->crtc_offset = RADEON_CRTC2_H_TOTAL_DISP - RADEON_CRTC_H_TOTAL_DISP;
	drm_crtc_helper_add(&radeon_crtc->base, &legacy_helper_funcs);
}