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drm/i915: Fix PCH reference clock for FDI on HSW/BDW 

The change to skip the PCH reference initialization during fastboot
did end up breaking FDI. To fix that let's try to do the PCH reference
init whenever we're disabling a DPLL that was using said reference
previously.

Cc: stable@vger.kernel.org
Tested-by: Andrija <akijo97@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=112084
Fixes: b16c7ed95c ("drm/i915: Do not touch the PCH SSC reference if a PLL is using it")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191022185643.1483-1-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
(cherry picked from commit dd5279c714)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Ville Syrjälä 2019-10-22 21:56:43 +03:00 committed by Rodrigo Vivi
parent dd7ebe6787
commit 59cd826fb5
3 changed files with 23 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/gpu/drm/i915/display/intel_display.c
View File

@ -9315,7 +9315,6 @@ static bool wrpll_uses_pch_ssc(struct drm_i915_private *dev_priv,
static void lpt_init_pch_refclk(struct drm_i915_private *dev_priv)
{
struct intel_encoder *encoder;
bool pch_ssc_in_use = false;
bool has_fdi = false;
for_each_intel_encoder(&dev_priv->drm, encoder) {
@ -9343,22 +9342,24 @@ static void lpt_init_pch_refclk(struct drm_i915_private *dev_priv)
* clock hierarchy. That would also allow us to do
* clock bending finally.
*/
dev_priv->pch_ssc_use = 0;
if (spll_uses_pch_ssc(dev_priv)) {
DRM_DEBUG_KMS("SPLL using PCH SSC\n");
pch_ssc_in_use = true;
dev_priv->pch_ssc_use |= BIT(DPLL_ID_SPLL);
}
if (wrpll_uses_pch_ssc(dev_priv, DPLL_ID_WRPLL1)) {
DRM_DEBUG_KMS("WRPLL1 using PCH SSC\n");
pch_ssc_in_use = true;
dev_priv->pch_ssc_use |= BIT(DPLL_ID_WRPLL1);
}
if (wrpll_uses_pch_ssc(dev_priv, DPLL_ID_WRPLL2)) {
DRM_DEBUG_KMS("WRPLL2 using PCH SSC\n");
pch_ssc_in_use = true;
dev_priv->pch_ssc_use |= BIT(DPLL_ID_WRPLL2);
}
if (pch_ssc_in_use)
if (dev_priv->pch_ssc_use)
return;
if (has_fdi) {

15
drivers/gpu/drm/i915/display/intel_dpll_mgr.c
View File

@ -525,16 +525,31 @@ static void hsw_ddi_wrpll_disable(struct drm_i915_private *dev_priv,
val = I915_READ(WRPLL_CTL(id));
I915_WRITE(WRPLL_CTL(id), val & ~WRPLL_PLL_ENABLE);
POSTING_READ(WRPLL_CTL(id));
/*
* Try to set up the PCH reference clock once all DPLLs
* that depend on it have been shut down.
*/
if (dev_priv->pch_ssc_use & BIT(id))
intel_init_pch_refclk(dev_priv);
}
static void hsw_ddi_spll_disable(struct drm_i915_private *dev_priv,
struct intel_shared_dpll *pll)
{
enum intel_dpll_id id = pll->info->id;
u32 val;
val = I915_READ(SPLL_CTL);
I915_WRITE(SPLL_CTL, val & ~SPLL_PLL_ENABLE);
POSTING_READ(SPLL_CTL);
/*
* Try to set up the PCH reference clock once all DPLLs
* that depend on it have been shut down.
*/
if (dev_priv->pch_ssc_use & BIT(id))
intel_init_pch_refclk(dev_priv);
}
static bool hsw_ddi_wrpll_get_hw_state(struct drm_i915_private *dev_priv,

2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -1723,6 +1723,8 @@ struct drm_i915_private {
struct work_struct idle_work;
} gem;
u8 pch_ssc_use;
/* For i945gm vblank irq vs. C3 workaround */
struct {
struct work_struct work;