To work around a DMC/Punit issue on ICL where the driver's
ICL_PORT_COMP_DW8/IREFGEN PHY setting is lost when entering/exiting DC6
state, make sure to reinit the PHY whenever disabling DC states.
Similarly the driver's PHY/DBUF/CDCLK settings should have been preserved
across DC5/6 transitions, so check this on all platforms.
This gets rid of the following WARN during suspend:
Combo PHY A HW state changed unexpectedly
Signed-off-by: Imre Deak <imre.d...@intel.com>
---
.../gpu/drm/i915/display/intel_display_power.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c
b/drivers/gpu/drm/i915/display/intel_display_power.c
index 374b75602141..5f2395585abc 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -966,8 +966,7 @@ static void gen9_assert_dbuf_enabled(struct
drm_i915_private *dev_priv)
"Unexpected DBuf power power state (0x%08x)\n", tmp);
}
-static void gen9_dc_off_power_well_enable(struct drm_i915_private *dev_priv,
- struct i915_power_well *power_well)
+static void gen9_disable_dc_states(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state cdclk_state = {};
@@ -991,6 +990,12 @@ static void gen9_dc_off_power_well_enable(struct
drm_i915_private *dev_priv,
intel_combo_phy_init(dev_priv);
}
+static void gen9_dc_off_power_well_enable(struct drm_i915_private *dev_priv,
+ struct i915_power_well *power_well)
+{
+ gen9_disable_dc_states(dev_priv);
+}
+
static void gen9_dc_off_power_well_disable(struct drm_i915_private *dev_priv,
struct i915_power_well *power_well)
{
@@ -4521,7 +4526,7 @@ static void skl_display_core_uninit(struct
drm_i915_private *dev_priv)
struct i915_power_domains *power_domains = &dev_priv->power_domains;
struct i915_power_well *well;
- gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+ gen9_disable_dc_states(dev_priv);
gen9_dbuf_disable(dev_priv);
@@ -4582,7 +4587,7 @@ static void bxt_display_core_uninit(struct
drm_i915_private *dev_priv)
struct i915_power_domains *power_domains = &dev_priv->power_domains;
struct i915_power_well *well;
- gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+ gen9_disable_dc_states(dev_priv);
gen9_dbuf_disable(dev_priv);
@@ -4642,7 +4647,7 @@ static void cnl_display_core_uninit(struct
drm_i915_private *dev_priv)
struct i915_power_domains *power_domains = &dev_priv->power_domains;
struct i915_power_well *well;
- gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+ gen9_disable_dc_states(dev_priv);
/* 1. Disable all display engine functions -> aready done */
@@ -4709,7 +4714,7 @@ static void icl_display_core_uninit(struct
drm_i915_private *dev_priv)
struct i915_power_domains *power_domains = &dev_priv->power_domains;
struct i915_power_well *well;
- gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
+ gen9_disable_dc_states(dev_priv);
/* 1. Disable all display engine functions -> aready done */
--
2.17.1
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