drm/i915/display/adl_p: Implement Wa_16011168373

Another WA that is required for PSR2.

BSpec: 54369
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: Matt Atwood <matthew.s.atwood@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210616203158.118111-3-jose.souza@intel.com

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

@@ -1112,6 +1112,14 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp)
 		intel_de_rmw(dev_priv, CHICKEN_PAR1_1, IGNORE_PSR2_HW_TRACKING,
 			     intel_dp->psr.psr2_sel_fetch_enabled ?
 			     IGNORE_PSR2_HW_TRACKING : 0);
+
+	/* Wa_16011168373:adlp */
+	if (IS_ADLP_DISPLAY_STEP(dev_priv, STEP_A0, STEP_A0) &&
+	    intel_dp->psr.psr2_enabled)
+		intel_de_rmw(dev_priv,
+			     TRANS_SET_CONTEXT_LATENCY(intel_dp->psr.transcoder),
+			     TRANS_SET_CONTEXT_LATENCY_MASK,
+			     TRANS_SET_CONTEXT_LATENCY_VALUE(1));
 }
 
 static bool psr_interrupt_error_check(struct intel_dp *intel_dp)
@@ -1289,6 +1297,13 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp)
 		intel_de_rmw(dev_priv, CHICKEN_PAR1_1,
 			     DIS_RAM_BYPASS_PSR2_MAN_TRACK, 0);
 
+	/* Wa_16011168373:adlp */
+	if (IS_ADLP_DISPLAY_STEP(dev_priv, STEP_A0, STEP_A0) &&
+	    intel_dp->psr.psr2_enabled)
+		intel_de_rmw(dev_priv,
+			     TRANS_SET_CONTEXT_LATENCY(intel_dp->psr.transcoder),
+			     TRANS_SET_CONTEXT_LATENCY_MASK, 0);
+
 	/* Disable PSR on Sink */
 	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
 

drivers/gpu/drm/i915/i915_reg.h

@@ -10356,6 +10356,14 @@ enum skl_power_gate {
 #define TRANS_MSA_MISC(tran) _MMIO_TRANS2(tran, _TRANSA_MSA_MISC)
 /* See DP_MSA_MISC_* for the bit definitions */
 
+#define _TRANS_A_SET_CONTEXT_LATENCY		0x6007C
+#define _TRANS_B_SET_CONTEXT_LATENCY		0x6107C
+#define _TRANS_C_SET_CONTEXT_LATENCY		0x6207C
+#define _TRANS_D_SET_CONTEXT_LATENCY		0x6307C
+#define TRANS_SET_CONTEXT_LATENCY(tran)		_MMIO_TRANS2(tran, _TRANS_A_SET_CONTEXT_LATENCY)
+#define  TRANS_SET_CONTEXT_LATENCY_MASK		REG_GENMASK(15, 0)
+#define  TRANS_SET_CONTEXT_LATENCY_VALUE(x)	REG_FIELD_PREP(TRANS_SET_CONTEXT_LATENCY_MASK, (x))
+
 /* LCPLL Control */
 #define LCPLL_CTL			_MMIO(0x130040)
 #define  LCPLL_PLL_DISABLE		(1 << 31)