[Intel-gfx] [PATCH] drm/i915/display: Disable PSR2 if TGL Display stepping is B1 from A0

[Gwan-gyeong Mun]

TGL PSR2 hardware tracking shows momentary flicker and screen shift if
TGL Display stepping is B1 from A0.
It has been fixed from TGL Display stepping C0.

HSDES: 18015970021
HSDES: 2209313811
BSpec: 55378

Cc: José Roberto de Souza <jose.souza at intel.com>
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 4ad756e238c5..2cc9eeab4baf 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -739,6 +739,12 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
 		return false;
 	}
 
+	/* Wa_2209313811 */
+	if (IS_TGL_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B1)) {
+		drm_dbg_kms(&dev_priv->drm, "PSR2 is not supported this Display stepping\n");
+		return false;
+	}
+
 	/* Wa_16011181250 */
 	if (IS_ROCKETLAKE(dev_priv) || IS_ALDERLAKE_S(dev_priv)) {
 		drm_dbg_kms(&dev_priv->drm, "PSR2 is defeatured for this platform\n");
-- 
2.30.1