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Revert "drm/i915: Disable SSC for outputs other than LVDS or DP"

Browse Source 
This reverts commit 633f2ea266 and the
attempted fix dcbe6f2b3d.

There is a single clock source used for both SSC (some LVDS and DP) and
non-SSC (VGA, DVI) outputs. So we need to be careful to only enable SSC
as necessary. However, fiddling with DREFCLK was causing DP links to be
dropped and we do not have a fix ready, so revert.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
2011-02-17 17:14:34 +00:00
parent 9035a97a32
commit fc9a2228ac
4 changed files with 41 additions and 82 deletions
Download Patch File Download Diff File Expand all files Collapse all files

117
drivers/gpu/drm/i915/intel_display.c
View File

@@ -4506,81 +4506,6 @@ static inline bool intel_panel_use_ssc(struct drm_i915_private *dev_priv)
return dev_priv->lvds_use_ssc && i915_panel_use_ssc;
}
static void intel_update_dref(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
struct drm_mode_config *mode_config = &dev->mode_config;
struct intel_encoder *encoder;
struct drm_crtc *crtc;
u32 temp;
bool lvds_on = false, edp_on = false, pch_edp_on = false, other_on = false;
list_for_each_entry(encoder, &mode_config->encoder_list, base.head) {
crtc = encoder->base.crtc;
if (!crtc || !crtc->enabled)
continue;
switch (encoder->type) {
case INTEL_OUTPUT_LVDS:
lvds_on = true;
break;
case INTEL_OUTPUT_EDP:
edp_on = true;
if (!pch_edp_on)
pch_edp_on = intel_encoder_is_pch_edp(&encoder->base);
break;
default:
other_on = true;
break;
}
}
/*XXX BIOS treats 16:31 as a mask for 0:15 */
temp = I915_READ(PCH_DREF_CONTROL);
/* First clear the current state for output switching */
temp &= ~DREF_SSC1_ENABLE;
temp &= ~DREF_SSC4_ENABLE;
temp &= ~DREF_SUPERSPREAD_SOURCE_MASK;
temp &= ~DREF_NONSPREAD_SOURCE_MASK;
temp &= ~DREF_SSC_SOURCE_MASK;
temp &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
I915_WRITE(PCH_DREF_CONTROL, temp);
POSTING_READ(PCH_DREF_CONTROL);
udelay(200);
if ((lvds_on || edp_on) && intel_panel_use_ssc(dev_priv)) {
temp |= DREF_SSC_SOURCE_ENABLE;
if (edp_on) {
if (!pch_edp_on) {
/* Enable CPU source on CPU attached eDP */
temp |= DREF_CPU_SOURCE_OUTPUT_DOWNSPREAD;
} else {
/* Enable SSC on PCH eDP if needed */
temp |= DREF_SUPERSPREAD_SOURCE_ENABLE;
}
I915_WRITE(PCH_DREF_CONTROL, temp);
}
if (!dev_priv->display_clock_mode)
temp |= DREF_SSC1_ENABLE;
}
if (other_on && dev_priv->display_clock_mode)
temp |= DREF_NONSPREAD_CK505_ENABLE;
else if (other_on) {
temp |= DREF_NONSPREAD_SOURCE_ENABLE;
if (edp_on && !pch_edp_on)
temp |= DREF_CPU_SOURCE_OUTPUT_NONSPREAD;
}
I915_WRITE(PCH_DREF_CONTROL, temp);
POSTING_READ(PCH_DREF_CONTROL);
udelay(200);
}
static int intel_crtc_mode_set(struct drm_crtc *crtc,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode,
@@ -4806,8 +4731,46 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
* PCH B stepping, previous chipset stepping should be
* ignoring this setting.
*/
if (HAS_PCH_SPLIT(dev))
intel_update_dref(dev_priv);
if (HAS_PCH_SPLIT(dev)) {
temp = I915_READ(PCH_DREF_CONTROL);
/* Always enable nonspread source */
temp &= ~DREF_NONSPREAD_SOURCE_MASK;
temp |= DREF_NONSPREAD_SOURCE_ENABLE;
temp &= ~DREF_SSC_SOURCE_MASK;
temp |= DREF_SSC_SOURCE_ENABLE;
I915_WRITE(PCH_DREF_CONTROL, temp);
POSTING_READ(PCH_DREF_CONTROL);
udelay(200);
if (has_edp_encoder) {
if (intel_panel_use_ssc(dev_priv)) {
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);
POSTING_READ(PCH_DREF_CONTROL);
udelay(200);
}
}
if (IS_PINEVIEW(dev)) {
fp = (1 << clock.n) << 16 | clock.m1 << 8 | clock.m2;