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Revert "drm/i915/ilk: Don't disable SSC source if it's in use"

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This reverts commit f165d2834c.

It breaks one of our CI systems. Quoting from Ville:

[   13.100979] [drm:ironlake_init_pch_refclk] has_panel 1 has_lvds 1 has_ck505 0 using_ssc_source 1
[   13.101413] ------------[ cut here ]------------
[   13.101429] kernel BUG at drivers/gpu/drm/i915/intel_display.c:8528!

"which is the 'BUG_ON(val != final)' at the end of ironlake_init_pch_refclk()."

Cc: stable@vger.kernel.org
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Lyude <cpaul@redhat.com>
Cc: marius.c.vlad@intel.com
References: https://www.spinics.net/lists/dri-devel/msg109557.html
Acked-by: Lyude <cpaul@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
This commit is contained in:
Daniel Vetter 2016-06-09 18:39:07 +02:00
parent d1b4eefdea
commit 8c07eb6833
1 changed files with 13 additions and 36 deletions
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49
drivers/gpu/drm/i915/intel_display.c
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@ -8361,14 +8361,12 @@ static void ironlake_init_pch_refclk(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_encoder *encoder;
int i;
u32 val, final;
bool has_lvds = false;
bool has_cpu_edp = false;
bool has_panel = false;
bool has_ck505 = false;
bool can_ssc = false;
bool using_ssc_source = false;
/* We need to take the global config into account */
for_each_intel_encoder(dev, encoder) {
@ -8395,22 +8393,8 @@ static void ironlake_init_pch_refclk(struct drm_device *dev)
can_ssc = true;
}
/* Check if any DPLLs are using the SSC source */
for (i = 0; i < dev_priv->num_shared_dpll; i++) {
u32 temp = I915_READ(PCH_DPLL(i));
if (!(temp & DPLL_VCO_ENABLE))
continue;
if ((temp & PLL_REF_INPUT_MASK) ==
PLLB_REF_INPUT_SPREADSPECTRUMIN) {
using_ssc_source = true;
break;
}
}
DRM_DEBUG_KMS("has_panel %d has_lvds %d has_ck505 %d using_ssc_source %d\n",
has_panel, has_lvds, has_ck505, using_ssc_source);
DRM_DEBUG_KMS("has_panel %d has_lvds %d has_ck505 %d\n",
has_panel, has_lvds, has_ck505);
/* Ironlake: try to setup display ref clock before DPLL
* enabling. This is only under driver's control after
@ -8430,12 +8414,9 @@ static void ironlake_init_pch_refclk(struct drm_device *dev)
else
final |= DREF_NONSPREAD_SOURCE_ENABLE;
final &= ~DREF_SSC_SOURCE_MASK;
final &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
if (!using_ssc_source) {
final &= ~DREF_SSC_SOURCE_MASK;
final &= ~DREF_SSC1_ENABLE;
}
final &= ~DREF_SSC1_ENABLE;
if (has_panel) {
final |= DREF_SSC_SOURCE_ENABLE;
@ -8498,7 +8479,7 @@ static void ironlake_init_pch_refclk(struct drm_device *dev)
POSTING_READ(PCH_DREF_CONTROL);
udelay(200);
} else {
DRM_DEBUG_KMS("Disabling CPU source output\n");
DRM_DEBUG_KMS("Disabling SSC entirely\n");
val &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
@ -8509,20 +8490,16 @@ static void ironlake_init_pch_refclk(struct drm_device *dev)
POSTING_READ(PCH_DREF_CONTROL);
udelay(200);
if (!using_ssc_source) {
DRM_DEBUG_KMS("Disabling SSC source\n");
/* Turn off the SSC source */
val &= ~DREF_SSC_SOURCE_MASK;
val |= DREF_SSC_SOURCE_DISABLE;
/* Turn off the SSC source */
val &= ~DREF_SSC_SOURCE_MASK;
val |= DREF_SSC_SOURCE_DISABLE;
/* Turn off SSC1 */
val &= ~DREF_SSC1_ENABLE;
/* Turn off SSC1 */
val &= ~DREF_SSC1_ENABLE;
I915_WRITE(PCH_DREF_CONTROL, val);
POSTING_READ(PCH_DREF_CONTROL);
udelay(200);
}
I915_WRITE(PCH_DREF_CONTROL, val);
POSTING_READ(PCH_DREF_CONTROL);
udelay(200);
}
BUG_ON(val != final);