drm/i915/display: Implement Wa_16013835468

PSR2 workaround required when mode has delayed vblank.

BSpec: 52890
BSpec: 49421
Cc: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220210185223.95399-2-jose.souza@intel.com

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

@@ -1063,7 +1063,23 @@ static void intel_psr_activate(struct intel_dp *intel_dp)
 	intel_dp->psr.active = true;
 }
 
-static void intel_psr_enable_source(struct intel_dp *intel_dp)
+static u32 wa_16013835468_bit_get(struct intel_dp *intel_dp)
+{
+	switch (intel_dp->psr.pipe) {
+	case PIPE_A:
+		return LATENCY_REPORTING_REMOVED_PIPE_A;
+	case PIPE_B:
+		return LATENCY_REPORTING_REMOVED_PIPE_B;
+	case PIPE_C:
+		return LATENCY_REPORTING_REMOVED_PIPE_C;
+	default:
+		MISSING_CASE(intel_dp->psr.pipe);
+		return 0;
+	}
+}
+
+static void intel_psr_enable_source(struct intel_dp *intel_dp,
+				    const struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 	enum transcoder cpu_transcoder = intel_dp->psr.transcoder;
@@ -1133,6 +1149,20 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp)
 		if (IS_ALDERLAKE_P(dev_priv))
 			intel_de_rmw(dev_priv, CLKGATE_DIS_MISC, 0,
 				     CLKGATE_DIS_MISC_DMASC_GATING_DIS);
+
+		/* Wa_16013835468:tgl[b0+], dg1 */
+		if (IS_TGL_DISPLAY_STEP(dev_priv, STEP_B0, STEP_FOREVER) ||
+		    IS_DG1(dev_priv)) {
+			u16 vtotal, vblank;
+
+			vtotal = crtc_state->uapi.adjusted_mode.crtc_vtotal -
+				 crtc_state->uapi.adjusted_mode.crtc_vdisplay;
+			vblank = crtc_state->uapi.adjusted_mode.crtc_vblank_end -
+				 crtc_state->uapi.adjusted_mode.crtc_vblank_start;
+			if (vblank > vtotal)
+				intel_de_rmw(dev_priv, GEN8_CHICKEN_DCPR_1, 0,
+					     wa_16013835468_bit_get(intel_dp));
+		}
 	}
 }
 
@@ -1198,7 +1228,7 @@ static void intel_psr_enable_locked(struct intel_dp *intel_dp,
 	intel_write_dp_vsc_sdp(encoder, crtc_state, &crtc_state->psr_vsc);
 	intel_snps_phy_update_psr_power_state(dev_priv, phy, true);
 	intel_psr_enable_sink(intel_dp);
-	intel_psr_enable_source(intel_dp);
+	intel_psr_enable_source(intel_dp, crtc_state);
 	intel_dp->psr.enabled = true;
 	intel_dp->psr.paused = false;
 
@@ -1297,6 +1327,12 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp)
 		if (IS_ALDERLAKE_P(dev_priv))
 			intel_de_rmw(dev_priv, CLKGATE_DIS_MISC,
 				     CLKGATE_DIS_MISC_DMASC_GATING_DIS, 0);
+
+		/* Wa_16013835468:tgl[b0+], dg1 */
+		if (IS_TGL_DISPLAY_STEP(dev_priv, STEP_B0, STEP_FOREVER) ||
+		    IS_DG1(dev_priv))
+			intel_de_rmw(dev_priv, GEN8_CHICKEN_DCPR_1,
+				     wa_16013835468_bit_get(intel_dp), 0);
 	}
 
 	intel_snps_phy_update_psr_power_state(dev_priv, phy, false);

drivers/gpu/drm/i915/i915_reg.h

@@ -5915,11 +5915,14 @@
 #define HSW_NDE_RSTWRN_OPT	_MMIO(0x46408)
 #define  RESET_PCH_HANDSHAKE_ENABLE	(1 << 4)
 
-#define GEN8_CHICKEN_DCPR_1		_MMIO(0x46430)
-#define   SKL_SELECT_ALTERNATE_DC_EXIT	REG_BIT(30)
-#define   ICL_DELAY_PMRSP		REG_BIT(22)
-#define   DISABLE_FLR_SRC		REG_BIT(15)
-#define   MASK_WAKEMEM			REG_BIT(13)
+#define GEN8_CHICKEN_DCPR_1			_MMIO(0x46430)
+#define   SKL_SELECT_ALTERNATE_DC_EXIT		REG_BIT(30)
+#define   LATENCY_REPORTING_REMOVED_PIPE_C	REG_BIT(25)
+#define   LATENCY_REPORTING_REMOVED_PIPE_B	REG_BIT(24)
+#define   LATENCY_REPORTING_REMOVED_PIPE_A	REG_BIT(23)
+#define   ICL_DELAY_PMRSP			REG_BIT(22)
+#define   DISABLE_FLR_SRC			REG_BIT(15)
+#define   MASK_WAKEMEM				REG_BIT(13)
 
 #define GEN11_CHICKEN_DCPR_2			_MMIO(0x46434)
 #define   DCPR_MASK_MAXLATENCY_MEMUP_CLR	REG_BIT(27)