[Intel-gfx] [PATCH v4 1/5] drm/i915/psr: Modify/fix Wa_16013835468 and prepare for Wa_14015648006

[Jouni Högander]

Wa_16013835468 is a separate from Wa_14015648006 and needs to be
applied for TGL onwards. Fix this by removing all the references to
Wa_14015648006 and apply Wa_16013835468 according to Bspec.

Also move workaround into separate function as a preparation for
Wa_14015648006 implementation. Apply this workaround in post plane
hook.

Bspec: 55378

Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 45 ++++++++++++++++--------
 1 file changed, 30 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 8dbf452d63c2..e66677e0554b 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1173,18 +1173,6 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp,
 			     intel_dp->psr.psr2_sel_fetch_enabled ?
 			     IGNORE_PSR2_HW_TRACKING : 0);
 
-	/*
-	 * Wa_16013835468
-	 * Wa_14015648006
-	 */
-	if (IS_MTL_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B0) ||
-	    IS_DISPLAY_VER(dev_priv, 12, 13)) {
-		if (crtc_state->hw.adjusted_mode.crtc_vblank_start !=
-		    crtc_state->hw.adjusted_mode.crtc_vdisplay)
-			intel_de_rmw(dev_priv, GEN8_CHICKEN_DCPR_1, 0,
-				     wa_16013835468_bit_get(intel_dp));
-	}
-
 	if (intel_dp->psr.psr2_enabled) {
 		if (DISPLAY_VER(dev_priv) == 9)
 			intel_de_rmw(dev_priv, CHICKEN_TRANS(cpu_transcoder), 0,
@@ -1359,10 +1347,8 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp)
 
 	/*
 	 * Wa_16013835468
-	 * Wa_14015648006
 	 */
-	if (IS_MTL_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B0) ||
-	    IS_DISPLAY_VER(dev_priv, 12, 13))
+	if (DISPLAY_VER(dev_priv) >= 12)
 		intel_de_rmw(dev_priv, GEN8_CHICKEN_DCPR_1,
 			     wa_16013835468_bit_get(intel_dp), 0);
 
@@ -1941,6 +1927,30 @@ void intel_psr_pre_plane_update(struct intel_atomic_state *state,
 	}
 }
 
+/*
+ * Wa_16013835468
+ */
+static void wm_optimization_wa(struct intel_dp *intel_dp,
+			   const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	bool set_wa_bit = false;
+
+	/* Wa_16013835468 */
+	if (DISPLAY_VER(dev_priv) >= 12)
+		set_wa_bit |= crtc_state->hw.adjusted_mode.crtc_vblank_start !=
+			crtc_state->hw.adjusted_mode.crtc_vdisplay;
+
+	set_wa_bit &= intel_dp->psr.enabled;
+
+	if (set_wa_bit)
+		intel_de_rmw(dev_priv, GEN8_CHICKEN_DCPR_1, 0,
+			     wa_16013835468_bit_get(intel_dp));
+	else
+		intel_de_rmw(dev_priv, GEN8_CHICKEN_DCPR_1,
+			     wa_16013835468_bit_get(intel_dp), 0);
+}
+
 static void _intel_psr_post_plane_update(const struct intel_atomic_state *state,
 					 const struct intel_crtc_state *crtc_state)
 {
@@ -1966,6 +1976,11 @@ static void _intel_psr_post_plane_update(const struct intel_atomic_state *state,
 		if (!psr->enabled && !keep_disabled)
 			intel_psr_enable_locked(intel_dp, crtc_state);
 
+		/*
+		 * Wa_16013835468
+		 */
+		wm_optimization_wa(intel_dp, crtc_state);
+
 		/* Force a PSR exit when enabling CRC to avoid CRC timeouts */
 		if (crtc_state->crc_enabled && psr->enabled)
 			psr_force_hw_tracking_exit(intel_dp);
-- 
2.34.1