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drm/i915: Drop non-HAS_PCH_SPLIT() code from ironlake_crtc_mode_set(). 

Ironlake is where the PCH split started.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Eric Anholt 2011-03-30 13:01:07 -07:00 committed by Keith Packard
parent db244b60e7
commit 8febb2974f
1 changed files with 157 additions and 216 deletions
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373
drivers/gpu/drm/i915/intel_display.c
View File

@ -4934,7 +4934,7 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
struct fdi_m_n m_n = {0}; struct fdi_m_n m_n = {0};
u32 reg, temp; u32 reg, temp;
u32 lvds_sync = 0; u32 lvds_sync = 0;
int target_clock; int target_clock, pixel_multiplier, lane, link_bw, bpp, factor;
list_for_each_entry(encoder, &mode_config->encoder_list, base.head) { list_for_each_entry(encoder, &mode_config->encoder_list, base.head) {
if (encoder->base.crtc != crtc) if (encoder->base.crtc != crtc)
@ -4976,8 +4976,8 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
refclk / 1000); refclk / 1000);
} else if (!IS_GEN2(dev)) { } else if (!IS_GEN2(dev)) {
refclk = 96000; refclk = 96000;
if (HAS_PCH_SPLIT(dev) && if (!has_edp_encoder ||
(!has_edp_encoder || intel_encoder_is_pch_edp(&has_edp_encoder->base))) intel_encoder_is_pch_edp(&has_edp_encoder->base))
refclk = 120000; /* 120Mhz refclk */ refclk = 120000; /* 120Mhz refclk */
} else { } else {
refclk = 48000; refclk = 48000;
@ -5036,140 +5036,137 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
} }
/* FDI link */ /* FDI link */
if (HAS_PCH_SPLIT(dev)) { pixel_multiplier = intel_mode_get_pixel_multiplier(adjusted_mode);
int pixel_multiplier = intel_mode_get_pixel_multiplier(adjusted_mode); lane = 0;
int lane = 0, link_bw, bpp; /* CPU eDP doesn't require FDI link, so just set DP M/N
/* CPU eDP doesn't require FDI link, so just set DP M/N according to current link config */
according to current link config */ if (has_edp_encoder &&
if (has_edp_encoder && !intel_encoder_is_pch_edp(&has_edp_encoder->base)) { !intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
target_clock = mode->clock;
intel_edp_link_config(has_edp_encoder,
&lane, &link_bw);
} else {
/* [e]DP over FDI requires target mode clock
instead of link clock */
if (is_dp || intel_encoder_is_pch_edp(&has_edp_encoder->base))
target_clock = mode->clock; target_clock = mode->clock;
intel_edp_link_config(has_edp_encoder, else
&lane, &link_bw); target_clock = adjusted_mode->clock;
} else {
/* [e]DP over FDI requires target mode clock
instead of link clock */
if (is_dp || intel_encoder_is_pch_edp(&has_edp_encoder->base))
target_clock = mode->clock;
else
target_clock = adjusted_mode->clock;
/* FDI is a binary signal running at ~2.7GHz, encoding /* FDI is a binary signal running at ~2.7GHz, encoding
* each output octet as 10 bits. The actual frequency * each output octet as 10 bits. The actual frequency
* is stored as a divider into a 100MHz clock, and the * is stored as a divider into a 100MHz clock, and the
* mode pixel clock is stored in units of 1KHz. * mode pixel clock is stored in units of 1KHz.
* Hence the bw of each lane in terms of the mode signal * Hence the bw of each lane in terms of the mode signal
* is: * is:
*/ */
link_bw = intel_fdi_link_freq(dev) * MHz(100)/KHz(1)/10; link_bw = intel_fdi_link_freq(dev) * MHz(100)/KHz(1)/10;
}
/* determine panel color depth */
temp = I915_READ(PIPECONF(pipe));
temp &= ~PIPE_BPC_MASK;
if (is_lvds) {
/* the BPC will be 6 if it is 18-bit LVDS panel */
if ((I915_READ(PCH_LVDS) & LVDS_A3_POWER_MASK) == LVDS_A3_POWER_UP)
temp |= PIPE_8BPC;
else
temp |= PIPE_6BPC;
} else if (has_edp_encoder) {
switch (dev_priv->edp.bpp/3) {
case 8:
temp |= PIPE_8BPC;
break;
case 10:
temp |= PIPE_10BPC;
break;
case 6:
temp |= PIPE_6BPC;
break;
case 12:
temp |= PIPE_12BPC;
break;
}
} else
temp |= PIPE_8BPC;
I915_WRITE(PIPECONF(pipe), temp);
switch (temp & PIPE_BPC_MASK) {
case PIPE_8BPC:
bpp = 24;
break;
case PIPE_10BPC:
bpp = 30;
break;
case PIPE_6BPC:
bpp = 18;
break;
case PIPE_12BPC:
bpp = 36;
break;
default:
DRM_ERROR("unknown pipe bpc value\n");
bpp = 24;
}
if (!lane) {
/*
* Account for spread spectrum to avoid
* oversubscribing the link. Max center spread
* is 2.5%; use 5% for safety's sake.
*/
u32 bps = target_clock * bpp * 21 / 20;
lane = bps / (link_bw * 8) + 1;
}
intel_crtc->fdi_lanes = lane;
if (pixel_multiplier > 1)
link_bw *= pixel_multiplier;
ironlake_compute_m_n(bpp, lane, target_clock, link_bw, &m_n);
} }
/* determine panel color depth */
temp = I915_READ(PIPECONF(pipe));
temp &= ~PIPE_BPC_MASK;
if (is_lvds) {
/* the BPC will be 6 if it is 18-bit LVDS panel */
if ((I915_READ(PCH_LVDS) & LVDS_A3_POWER_MASK) == LVDS_A3_POWER_UP)
temp |= PIPE_8BPC;
else
temp |= PIPE_6BPC;
} else if (has_edp_encoder) {
switch (dev_priv->edp.bpp/3) {
case 8:
temp |= PIPE_8BPC;
break;
case 10:
temp |= PIPE_10BPC;
break;
case 6:
temp |= PIPE_6BPC;
break;
case 12:
temp |= PIPE_12BPC;
break;
}
} else
temp |= PIPE_8BPC;
I915_WRITE(PIPECONF(pipe), temp);
switch (temp & PIPE_BPC_MASK) {
case PIPE_8BPC:
bpp = 24;
break;
case PIPE_10BPC:
bpp = 30;
break;
case PIPE_6BPC:
bpp = 18;
break;
case PIPE_12BPC:
bpp = 36;
break;
default:
DRM_ERROR("unknown pipe bpc value\n");
bpp = 24;
}
if (!lane) {
/*
* Account for spread spectrum to avoid
* oversubscribing the link. Max center spread
* is 2.5%; use 5% for safety's sake.
*/
u32 bps = target_clock * bpp * 21 / 20;
lane = bps / (link_bw * 8) + 1;
}
intel_crtc->fdi_lanes = lane;
if (pixel_multiplier > 1)
link_bw *= pixel_multiplier;
ironlake_compute_m_n(bpp, lane, target_clock, link_bw, &m_n);
/* Ironlake: try to setup display ref clock before DPLL /* Ironlake: try to setup display ref clock before DPLL
* enabling. This is only under driver's control after * enabling. This is only under driver's control after
* PCH B stepping, previous chipset stepping should be * PCH B stepping, previous chipset stepping should be
* ignoring this setting. * ignoring this setting.
*/ */
if (HAS_PCH_SPLIT(dev)) { temp = I915_READ(PCH_DREF_CONTROL);
temp = I915_READ(PCH_DREF_CONTROL); /* Always enable nonspread source */
/* Always enable nonspread source */ temp &= ~DREF_NONSPREAD_SOURCE_MASK;
temp &= ~DREF_NONSPREAD_SOURCE_MASK; temp |= DREF_NONSPREAD_SOURCE_ENABLE;
temp |= DREF_NONSPREAD_SOURCE_ENABLE; temp &= ~DREF_SSC_SOURCE_MASK;
temp &= ~DREF_SSC_SOURCE_MASK; temp |= DREF_SSC_SOURCE_ENABLE;
temp |= DREF_SSC_SOURCE_ENABLE; I915_WRITE(PCH_DREF_CONTROL, temp);
I915_WRITE(PCH_DREF_CONTROL, temp);
POSTING_READ(PCH_DREF_CONTROL); POSTING_READ(PCH_DREF_CONTROL);
udelay(200); udelay(200);
if (has_edp_encoder) { if (has_edp_encoder) {
if (intel_panel_use_ssc(dev_priv)) { if (intel_panel_use_ssc(dev_priv)) {
temp |= DREF_SSC1_ENABLE; temp |= DREF_SSC1_ENABLE;
I915_WRITE(PCH_DREF_CONTROL, temp);
POSTING_READ(PCH_DREF_CONTROL);
udelay(200);
}
temp &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
/* Enable CPU source on CPU attached eDP */
if (!intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
if (intel_panel_use_ssc(dev_priv))
temp |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
else
temp |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
} else {
/* Enable SSC on PCH eDP if needed */
if (intel_panel_use_ssc(dev_priv)) {
DRM_ERROR("enabling SSC on PCH\n");
temp |= DREF_SUPERSPREAD_SOURCE_ENABLE;
}
}
I915_WRITE(PCH_DREF_CONTROL, temp); I915_WRITE(PCH_DREF_CONTROL, temp);
POSTING_READ(PCH_DREF_CONTROL); POSTING_READ(PCH_DREF_CONTROL);
udelay(200); udelay(200);
} }
temp &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
/* Enable CPU source on CPU attached eDP */
if (!intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
if (intel_panel_use_ssc(dev_priv))
temp |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
else
temp |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
} else {
/* Enable SSC on PCH eDP if needed */
if (intel_panel_use_ssc(dev_priv)) {
DRM_ERROR("enabling SSC on PCH\n");
temp |= DREF_SUPERSPREAD_SOURCE_ENABLE;
}
}
I915_WRITE(PCH_DREF_CONTROL, temp);
POSTING_READ(PCH_DREF_CONTROL);
udelay(200);
} }
if (IS_PINEVIEW(dev)) { if (IS_PINEVIEW(dev)) {
@ -5185,24 +5182,19 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
} }
/* Enable autotuning of the PLL clock (if permissible) */ /* Enable autotuning of the PLL clock (if permissible) */
if (HAS_PCH_SPLIT(dev)) { factor = 21;
int factor = 21; if (is_lvds) {
if ((intel_panel_use_ssc(dev_priv) &&
dev_priv->lvds_ssc_freq == 100) ||
(I915_READ(PCH_LVDS) & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP)
factor = 25;
} else if (is_sdvo && is_tv)
factor = 20;
if (is_lvds) { if (clock.m1 < factor * clock.n)
if ((intel_panel_use_ssc(dev_priv) && fp |= FP_CB_TUNE;
dev_priv->lvds_ssc_freq == 100) ||
(I915_READ(PCH_LVDS) & LVDS_CLKB_POWER_MASK) == LVDS_CLKB_POWER_UP)
factor = 25;
} else if (is_sdvo && is_tv)
factor = 20;
if (clock.m1 < factor * clock.n)
fp |= FP_CB_TUNE;
}
dpll = 0; dpll = 0;
if (!HAS_PCH_SPLIT(dev))
dpll = DPLL_VGA_MODE_DIS;
if (!IS_GEN2(dev)) { if (!IS_GEN2(dev)) {
if (is_lvds) if (is_lvds)
@ -5214,7 +5206,7 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
if (pixel_multiplier > 1) { if (pixel_multiplier > 1) {
if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev)) if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
dpll |= (pixel_multiplier - 1) << SDVO_MULTIPLIER_SHIFT_HIRES; dpll |= (pixel_multiplier - 1) << SDVO_MULTIPLIER_SHIFT_HIRES;
else if (HAS_PCH_SPLIT(dev)) else
dpll |= (pixel_multiplier - 1) << PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT; dpll |= (pixel_multiplier - 1) << PLL_REF_SDVO_HDMI_MULTIPLIER_SHIFT;
} }
dpll |= DPLL_DVO_HIGH_SPEED; dpll |= DPLL_DVO_HIGH_SPEED;
@ -5228,8 +5220,7 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
else { else {
dpll |= (1 << (clock.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT; dpll |= (1 << (clock.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
/* also FPA1 */ /* also FPA1 */
if (HAS_PCH_SPLIT(dev)) dpll |= (1 << (clock.p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
dpll |= (1 << (clock.p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
if (IS_G4X(dev) && has_reduced_clock) if (IS_G4X(dev) && has_reduced_clock)
dpll |= (1 << (reduced_clock.p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT; dpll |= (1 << (reduced_clock.p1 - 1)) << DPLL_FPA1_P1_POST_DIV_SHIFT;
} }
@ -5247,8 +5238,6 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14; dpll |= DPLLB_LVDS_P2_CLOCK_DIV_14;
break; break;
} }
if (INTEL_INFO(dev)->gen >= 4 && !HAS_PCH_SPLIT(dev))
dpll |= (6 << PLL_LOAD_PULSE_PHASE_SHIFT);
} else { } else {
if (is_lvds) { if (is_lvds) {
dpll |= (1 << (clock.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT; dpll |= (1 << (clock.p1 - 1)) << DPLL_FPA01_P1_POST_DIV_SHIFT;
@ -5279,15 +5268,6 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
/* Set up the display plane register */ /* Set up the display plane register */
dspcntr = DISPPLANE_GAMMA_ENABLE; dspcntr = DISPPLANE_GAMMA_ENABLE;
/* Ironlake's plane is forced to pipe, bit 24 is to
enable color space conversion */
if (!HAS_PCH_SPLIT(dev)) {
if (pipe == 0)
dspcntr &= ~DISPPLANE_SEL_PIPE_MASK;
else
dspcntr |= DISPPLANE_SEL_PIPE_B;
}
if (pipe == 0 && INTEL_INFO(dev)->gen < 4) { if (pipe == 0 && INTEL_INFO(dev)->gen < 4) {
/* Enable pixel doubling when the dot clock is > 90% of the (display) /* Enable pixel doubling when the dot clock is > 90% of the (display)
* core speed. * core speed.
@ -5302,20 +5282,12 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
pipeconf &= ~PIPECONF_DOUBLE_WIDE; pipeconf &= ~PIPECONF_DOUBLE_WIDE;
} }
if (!HAS_PCH_SPLIT(dev))
dpll |= DPLL_VCO_ENABLE;
DRM_DEBUG_KMS("Mode for pipe %c:\n", pipe == 0 ? 'A' : 'B'); DRM_DEBUG_KMS("Mode for pipe %c:\n", pipe == 0 ? 'A' : 'B');
drm_mode_debug_printmodeline(mode); drm_mode_debug_printmodeline(mode);
/* assign to Ironlake registers */ /* assign to Ironlake registers */
if (HAS_PCH_SPLIT(dev)) { fp_reg = PCH_FP0(pipe);
fp_reg = PCH_FP0(pipe); dpll_reg = PCH_DPLL(pipe);
dpll_reg = PCH_DPLL(pipe);
} else {
fp_reg = FP0(pipe);
dpll_reg = DPLL(pipe);
}
/* PCH eDP needs FDI, but CPU eDP does not */ /* PCH eDP needs FDI, but CPU eDP does not */
if (!has_edp_encoder || intel_encoder_is_pch_edp(&has_edp_encoder->base)) { if (!has_edp_encoder || intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
@ -5354,9 +5326,7 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
* things on. * things on.
*/ */
if (is_lvds) { if (is_lvds) {
reg = LVDS; reg = PCH_LVDS;
if (HAS_PCH_SPLIT(dev))
reg = PCH_LVDS;
temp = I915_READ(reg); temp = I915_READ(reg);
temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP; temp |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
@ -5385,13 +5355,6 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
* appropriately here, but we need to look more thoroughly into how * appropriately here, but we need to look more thoroughly into how
* panels behave in the two modes. * panels behave in the two modes.
*/ */
/* set the dithering flag on non-PCH LVDS as needed */
if (INTEL_INFO(dev)->gen >= 4 && !HAS_PCH_SPLIT(dev)) {
if (dev_priv->lvds_dither)
temp |= LVDS_ENABLE_DITHER;
else
temp &= ~LVDS_ENABLE_DITHER;
}
if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC) if (adjusted_mode->flags & DRM_MODE_FLAG_NHSYNC)
lvds_sync |= LVDS_HSYNC_POLARITY; lvds_sync |= LVDS_HSYNC_POLARITY;
if (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC) if (adjusted_mode->flags & DRM_MODE_FLAG_NVSYNC)
@ -5412,18 +5375,16 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
} }
/* set the dithering flag and clear for anything other than a panel. */ /* set the dithering flag and clear for anything other than a panel. */
if (HAS_PCH_SPLIT(dev)) { pipeconf &= ~PIPECONF_DITHER_EN;
pipeconf &= ~PIPECONF_DITHER_EN; pipeconf &= ~PIPECONF_DITHER_TYPE_MASK;
pipeconf &= ~PIPECONF_DITHER_TYPE_MASK; if (dev_priv->lvds_dither && (is_lvds || has_edp_encoder)) {
if (dev_priv->lvds_dither && (is_lvds || has_edp_encoder)) { pipeconf |= PIPECONF_DITHER_EN;
pipeconf |= PIPECONF_DITHER_EN; pipeconf |= PIPECONF_DITHER_TYPE_ST1;
pipeconf |= PIPECONF_DITHER_TYPE_ST1;
}
} }
if (is_dp || intel_encoder_is_pch_edp(&has_edp_encoder->base)) { if (is_dp || intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
intel_dp_set_m_n(crtc, mode, adjusted_mode); intel_dp_set_m_n(crtc, mode, adjusted_mode);
} else if (HAS_PCH_SPLIT(dev)) { } else {
/* For non-DP output, clear any trans DP clock recovery setting.*/ /* For non-DP output, clear any trans DP clock recovery setting.*/
I915_WRITE(TRANSDATA_M1(pipe), 0); I915_WRITE(TRANSDATA_M1(pipe), 0);
I915_WRITE(TRANSDATA_N1(pipe), 0); I915_WRITE(TRANSDATA_N1(pipe), 0);
@ -5431,31 +5392,20 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
I915_WRITE(TRANSDPLINK_N1(pipe), 0); I915_WRITE(TRANSDPLINK_N1(pipe), 0);
} }
if (!has_edp_encoder || intel_encoder_is_pch_edp(&has_edp_encoder->base)) { if (!has_edp_encoder ||
intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
I915_WRITE(dpll_reg, dpll); I915_WRITE(dpll_reg, dpll);
/* Wait for the clocks to stabilize. */ /* Wait for the clocks to stabilize. */
POSTING_READ(dpll_reg); POSTING_READ(dpll_reg);
udelay(150); udelay(150);
if (INTEL_INFO(dev)->gen >= 4 && !HAS_PCH_SPLIT(dev)) { /* The pixel multiplier can only be updated once the
temp = 0; * DPLL is enabled and the clocks are stable.
if (is_sdvo) { *
temp = intel_mode_get_pixel_multiplier(adjusted_mode); * So write it again.
if (temp > 1) */
temp = (temp - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT; I915_WRITE(dpll_reg, dpll);
else
temp = 0;
}
I915_WRITE(DPLL_MD(pipe), temp);
} else {
/* The pixel multiplier can only be updated once the
* DPLL is enabled and the clocks are stable.
*
* So write it again.
*/
I915_WRITE(dpll_reg, dpll);
}
} }
intel_crtc->lowfreq_avail = false; intel_crtc->lowfreq_avail = false;
@ -5506,33 +5456,24 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
(adjusted_mode->crtc_vsync_start - 1) | (adjusted_mode->crtc_vsync_start - 1) |
((adjusted_mode->crtc_vsync_end - 1) << 16)); ((adjusted_mode->crtc_vsync_end - 1) << 16));
/* pipesrc and dspsize control the size that is scaled from, /* pipesrc controls the size that is scaled from, which should
* which should always be the user's requested size. * always be the user's requested size.
*/ */
if (!HAS_PCH_SPLIT(dev)) {
I915_WRITE(DSPSIZE(plane),
((mode->vdisplay - 1) << 16) |
(mode->hdisplay - 1));
I915_WRITE(DSPPOS(plane), 0);
}
I915_WRITE(PIPESRC(pipe), I915_WRITE(PIPESRC(pipe),
((mode->hdisplay - 1) << 16) | (mode->vdisplay - 1)); ((mode->hdisplay - 1) << 16) | (mode->vdisplay - 1));
if (HAS_PCH_SPLIT(dev)) { I915_WRITE(PIPE_DATA_M1(pipe), TU_SIZE(m_n.tu) | m_n.gmch_m);
I915_WRITE(PIPE_DATA_M1(pipe), TU_SIZE(m_n.tu) | m_n.gmch_m); I915_WRITE(PIPE_DATA_N1(pipe), m_n.gmch_n);
I915_WRITE(PIPE_DATA_N1(pipe), m_n.gmch_n); I915_WRITE(PIPE_LINK_M1(pipe), m_n.link_m);
I915_WRITE(PIPE_LINK_M1(pipe), m_n.link_m); I915_WRITE(PIPE_LINK_N1(pipe), m_n.link_n);
I915_WRITE(PIPE_LINK_N1(pipe), m_n.link_n);
if (has_edp_encoder && !intel_encoder_is_pch_edp(&has_edp_encoder->base)) { if (has_edp_encoder &&
ironlake_set_pll_edp(crtc, adjusted_mode->clock); !intel_encoder_is_pch_edp(&has_edp_encoder->base)) {
} ironlake_set_pll_edp(crtc, adjusted_mode->clock);
} }
I915_WRITE(PIPECONF(pipe), pipeconf); I915_WRITE(PIPECONF(pipe), pipeconf);
POSTING_READ(PIPECONF(pipe)); POSTING_READ(PIPECONF(pipe));
if (!HAS_PCH_SPLIT(dev))
intel_enable_pipe(dev_priv, pipe, false);
intel_wait_for_vblank(dev, pipe); intel_wait_for_vblank(dev, pipe);