drm/i915/display/adlp: Add new PSR2 workarounds

Wa_16014451276 fixes the starting coordinate for PSR2 selective
updates. CHICKEN_TRANS definition of the workaround bit has a wrong
name based on workaround definition and HSD.

Wa_14014971508 allows the screen to continue to be updated when
coming back from DC5/DC6 and SF_SINGLE_FULL_FRAME bit is not kept
set in PSR2_MAN_TRK_CTL.

Wa_16012604467 fixes underruns when exiting PSR2 when it is in one
of its internal states.

Wa_14014971508 is still in pending status in BSpec but by
the time this is reviewed and ready to be merged it will be finalized.

v2:
- renamed register to ADLP_1_BASED_X_GRANULARITY
- added comment about all ADL-P supported panels being 1 based X
granularity

BSpec: 54369
BSpec: 50054
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@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/20210914212507.177511-5-jose.souza@intel.com

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

@@ -1087,6 +1087,16 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp)
 		intel_de_write(dev_priv, reg, chicken);
 	}
 
+	/*
+	 * Wa_16014451276:adlp
+	 * All supported adlp panels have 1-based X granularity, this may
+	 * cause issues if non-supported panels are used.
+	 */
+	if (IS_ALDERLAKE_P(dev_priv) &&
+	    intel_dp->psr.psr2_enabled)
+		intel_de_rmw(dev_priv, CHICKEN_TRANS(cpu_transcoder), 0,
+			     ADLP_1_BASED_X_GRANULARITY);
+
 	/*
 	 * Per Spec: Avoid continuous PSR exit by masking MEMUP and HPD also
 	 * mask LPSP to avoid dependency on other drivers that might block
@@ -1132,6 +1142,11 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp)
 			     TRANS_SET_CONTEXT_LATENCY(intel_dp->psr.transcoder),
 			     TRANS_SET_CONTEXT_LATENCY_MASK,
 			     TRANS_SET_CONTEXT_LATENCY_VALUE(1));
+
+	/* Wa_16012604467:adlp */
+	if (IS_ALDERLAKE_P(dev_priv) && intel_dp->psr.psr2_enabled)
+		intel_de_rmw(dev_priv, CLKGATE_DIS_MISC, 0,
+			     CLKGATE_DIS_MISC_DMASC_GATING_DIS);
 }
 
 static bool psr_interrupt_error_check(struct intel_dp *intel_dp)
@@ -1321,6 +1336,11 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp)
 			     TRANS_SET_CONTEXT_LATENCY(intel_dp->psr.transcoder),
 			     TRANS_SET_CONTEXT_LATENCY_MASK, 0);
 
+	/* Wa_16012604467:adlp */
+	if (IS_ALDERLAKE_P(dev_priv) && intel_dp->psr.psr2_enabled)
+		intel_de_rmw(dev_priv, CLKGATE_DIS_MISC,
+			     CLKGATE_DIS_MISC_DMASC_GATING_DIS, 0);
+
 	intel_snps_phy_update_psr_power_state(dev_priv, phy, false);
 
 	/* Disable PSR on Sink */
@@ -1489,8 +1509,13 @@ static void psr2_man_trk_ctl_calc(struct intel_crtc_state *crtc_state,
 	u32 val = PSR2_MAN_TRK_CTL_ENABLE;
 
 	if (full_update) {
+		/*
+		 * Wa_14014971508:adlp
+		 * SINGLE_FULL_FRAME bit is not hold in register so can not be
+		 * restored by DMC, so using CONTINUOS_FULL_FRAME to mimic that
+		 */
 		if (IS_ALDERLAKE_P(dev_priv))
-			val |= ADLP_PSR2_MAN_TRK_CTL_SF_SINGLE_FULL_FRAME;
+			val |= ADLP_PSR2_MAN_TRK_CTL_SF_CONTINUOS_FULL_FRAME;
 		else
 			val |= PSR2_MAN_TRK_CTL_SF_SINGLE_FULL_FRAME;
 

drivers/gpu/drm/i915/i915_reg.h

@@ -8205,6 +8205,7 @@ enum {
 #define  VSC_DATA_SEL_SOFTWARE_CONTROL	REG_BIT(25) /* GLK */
 #define  FECSTALL_DIS_DPTSTREAM_DPTTG	REG_BIT(23)
 #define  DDI_TRAINING_OVERRIDE_ENABLE	REG_BIT(19)
+#define  ADLP_1_BASED_X_GRANULARITY	REG_BIT(18)
 #define  DDI_TRAINING_OVERRIDE_VALUE	REG_BIT(18)
 #define  DDIE_TRAINING_OVERRIDE_ENABLE	REG_BIT(17) /* CHICKEN_TRANS_A only */
 #define  DDIE_TRAINING_OVERRIDE_VALUE	REG_BIT(16) /* CHICKEN_TRANS_A only */
@@ -12759,4 +12760,7 @@ enum skl_power_gate {
 #define CLKREQ_POLICY			_MMIO(0x101038)
 #define  CLKREQ_POLICY_MEM_UP_OVRD	REG_BIT(1)
 
+#define CLKGATE_DIS_MISC			_MMIO(0x46534)
+#define  CLKGATE_DIS_MISC_DMASC_GATING_DIS	REG_BIT(21)
+
 #endif /* _I915_REG_H_ */