drm/i915/adlp: Implement workaround 16013190616

New workaround added to specification, requiring bit 15 of
GEN8_CHICKEN_DCPR_1 to be programed before power well 1 is enabled.

BSpec: 54369
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211028230449.115832-1-jose.souza@intel.com

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

@@ -435,6 +435,11 @@ static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
 
 		pg = DISPLAY_VER(dev_priv) >= 11 ? ICL_PW_CTL_IDX_TO_PG(pw_idx) :
 						 SKL_PW_CTL_IDX_TO_PG(pw_idx);
+
+		/* Wa_16013190616:adlp */
+		if (IS_ALDERLAKE_P(dev_priv) && pg == SKL_PG1)
+			intel_de_rmw(dev_priv, GEN8_CHICKEN_DCPR_1, 0, DISABLE_FLR_SRC);
+
 		/*
 		 * For PW1 we have to wait both for the PW0/PG0 fuse state
 		 * before enabling the power well and PW1/PG1's own fuse

drivers/gpu/drm/i915/i915_reg.h

@@ -8308,9 +8308,10 @@ enum {
 #define  RESET_PCH_HANDSHAKE_ENABLE	(1 << 4)
 
 #define GEN8_CHICKEN_DCPR_1		_MMIO(0x46430)
-#define   SKL_SELECT_ALTERNATE_DC_EXIT	(1 << 30)
-#define   ICL_DELAY_PMRSP		(1 << 22)
-#define   MASK_WAKEMEM			(1 << 13)
+#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 GEN11_CHICKEN_DCPR_2			_MMIO(0x46434)
 #define   DCPR_MASK_MAXLATENCY_MEMUP_CLR	REG_BIT(27)