drm/i915/display: Implement WA 1408330847

From the 3 WAs for PSR2 man track/selective fetch this is only one
needed when doing single full frames at every flip.

Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200810174144.76761-2-jose.souza@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/i915/display/intel_psr.c

@@ -553,13 +553,21 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
 		val |= EDP_PSR2_FAST_WAKE(7);
 	}
 
-	if (dev_priv->psr.psr2_sel_fetch_enabled)
+	if (dev_priv->psr.psr2_sel_fetch_enabled) {
+		/* WA 1408330847 */
+		if (IS_TGL_REVID(dev_priv, TGL_REVID_A0, TGL_REVID_A0) ||
+		    IS_RKL_REVID(dev_priv, RKL_REVID_A0, RKL_REVID_A0))
+			intel_de_rmw(dev_priv, CHICKEN_PAR1_1,
+				     DIS_RAM_BYPASS_PSR2_MAN_TRACK,
+				     DIS_RAM_BYPASS_PSR2_MAN_TRACK);
+
 		intel_de_write(dev_priv,
 			       PSR2_MAN_TRK_CTL(dev_priv->psr.transcoder),
 			       PSR2_MAN_TRK_CTL_ENABLE);
-	else if (HAS_PSR2_SEL_FETCH(dev_priv))
+	} else if (HAS_PSR2_SEL_FETCH(dev_priv)) {
 		intel_de_write(dev_priv,
 			       PSR2_MAN_TRK_CTL(dev_priv->psr.transcoder), 0);
+	}
 
 	/*
 	 * PSR2 HW is incorrectly using EDP_PSR_TP1_TP3_SEL and BSpec is
@@ -1099,6 +1107,13 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp)
 				    psr_status_mask, 2000))
 		drm_err(&dev_priv->drm, "Timed out waiting PSR idle state\n");
 
+	/* WA 1408330847 */
+	if (dev_priv->psr.psr2_sel_fetch_enabled &&
+	    (IS_TGL_REVID(dev_priv, TGL_REVID_A0, TGL_REVID_A0) ||
+	     IS_RKL_REVID(dev_priv, RKL_REVID_A0, RKL_REVID_A0)))
+		intel_de_rmw(dev_priv, CHICKEN_PAR1_1,
+			     DIS_RAM_BYPASS_PSR2_MAN_TRACK, 0);
+
 	/* Disable PSR on Sink */
 	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
 

drivers/gpu/drm/i915/i915_reg.h

@@ -7878,6 +7878,7 @@ enum {
 # define CHICKEN3_DGMG_DONE_FIX_DISABLE		(1 << 2)
 
 #define CHICKEN_PAR1_1			_MMIO(0x42080)
+#define  DIS_RAM_BYPASS_PSR2_MAN_TRACK	(1 << 16)
 #define  SKL_DE_COMPRESSED_HASH_MODE	(1 << 15)
 #define  DPA_MASK_VBLANK_SRD		(1 << 15)
 #define  FORCE_ARB_IDLE_PLANES		(1 << 14)