drm/i915/gen12: implement Wa_14011508470

Update code to reflect recent bspec changes

Bspec: 52890
Bspec: 53508
Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com>
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200624215723.2316-1-matthew.s.atwood@intel.com

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

@@ -5298,6 +5298,7 @@ static void icl_display_core_init(struct drm_i915_private *dev_priv,
 {
 	struct i915_power_domains *power_domains = &dev_priv->power_domains;
 	struct i915_power_well *well;
+	u32 val;
 
 	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
 
@@ -5331,6 +5332,13 @@ static void icl_display_core_init(struct drm_i915_private *dev_priv,
 
 	if (resume && dev_priv->csr.dmc_payload)
 		intel_csr_load_program(dev_priv);
+
+	/* Wa_14011508470 */
+	if (IS_GEN(dev_priv, 12)) {
+		val = DCPR_CLEAR_MEMSTAT_DIS | DCPR_SEND_RESP_IMM |
+		      DCPR_MASK_LPMODE | DCPR_MASK_MAXLATENCY_MEMUP_CLR;
+		intel_uncore_rmw(&dev_priv->uncore, GEN11_CHICKEN_DCPR_2, 0, val);
+	}
 }
 
 static void icl_display_core_uninit(struct drm_i915_private *dev_priv)

drivers/gpu/drm/i915/i915_reg.h

@@ -7880,6 +7880,12 @@ enum {
 #define   MASK_WAKEMEM			(1 << 13)
 #define   CNL_DDI_CLOCK_REG_ACCESS_ON	(1 << 7)
 
+#define GEN11_CHICKEN_DCPR_2			_MMIO(0x46434)
+#define   DCPR_MASK_MAXLATENCY_MEMUP_CLR	REG_BIT(27)
+#define   DCPR_MASK_LPMODE			REG_BIT(26)
+#define   DCPR_SEND_RESP_IMM			REG_BIT(25)
+#define   DCPR_CLEAR_MEMSTAT_DIS		REG_BIT(24)
+
 #define SKL_DFSM			_MMIO(0x51000)
 #define   SKL_DFSM_DISPLAY_PM_DISABLE	(1 << 27)
 #define   SKL_DFSM_DISPLAY_HDCP_DISABLE	(1 << 25)