[Intel-gfx] [PATCH 1/5] drm/i915/display: Limit disabling PSR around cdclk changes to ADL-P

[Anusha Srivatsa]

From: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>

Only ADL-P platform requires a temporal disabling of PSR for changing the
CDCLK PLL frequency with crawling. Changing the CDCLK PLL frequency on
prior platforms of ADL-P or changing the CDCLK PLL frequency without
crawling on ADL-P don't need to disable of PSR.

Bspec: 49207

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Mika Kahola <mika.kahola at intel.com>
Cc: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Fixes: 17c1a4b7ac6f ("drm/i915: Disable PSR around cdclk change")
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
---
 drivers/gpu/drm/i915/display/intel_cdclk.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index 613ffcc68eba..6da426d26aac 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -1962,10 +1962,18 @@ static void intel_set_cdclk(struct drm_i915_private *dev_priv,
 
 	intel_dump_cdclk_config(cdclk_config, "Changing CDCLK to");
 
-	for_each_intel_encoder_with_psr(&dev_priv->drm, encoder) {
-		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+	/*
+	 * Only ADL-P platform requires a temporal disabling of PSR for changing
+	 * the CDCLK PLL frequency with crawling.
+	 * Changing the CDCLK PLL frequency on prior platforms of ADL-P or changing
+	 * the CDCLK PLL frequency without crawling on ADL-P don't need to disable of PSR.
+	 */
+	if (IS_ALDERLAKE_P(dev_priv)) {
+		for_each_intel_encoder_with_psr(&dev_priv->drm, encoder) {
+			struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 
-		intel_psr_pause(intel_dp);
+			intel_psr_pause(intel_dp);
+		}
 	}
 
 	/*
@@ -1990,10 +1998,12 @@ static void intel_set_cdclk(struct drm_i915_private *dev_priv,
 	}
 	mutex_unlock(&dev_priv->gmbus_mutex);
 
-	for_each_intel_encoder_with_psr(&dev_priv->drm, encoder) {
-		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+	if (IS_ALDERLAKE_P(dev_priv)) {
+		for_each_intel_encoder_with_psr(&dev_priv->drm, encoder) {
+			struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 
-		intel_psr_resume(intel_dp);
+			intel_psr_resume(intel_dp);
+		}
 	}
 
 	if (drm_WARN(&dev_priv->drm,
-- 
2.32.0