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
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f09120c..284af0c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/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)