[Intel-gfx] [PATCH] drm/i915: implement Wa_14011508470;gen12

* [Intel-gfx] [PATCH] drm/i915: implement Wa_14011508470;gen12
@ 2020-06-24 21:57 Matt Atwood
  2020-06-25 17:03 ` Radhakrishna Sripada
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Matt Atwood @ 2020-06-24 21:57 UTC (permalink / raw)
  To: intel-gfx

Update code to reflect recent bspec changes

Bspec: 52890
Bspec: 53508

Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_power.c | 8 ++++++++
 drivers/gpu/drm/i915/i915_reg.h                    | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index c3eeebadc0b8..22395be35364 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -6007,6 +6007,7 @@ 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);
 
@@ -6043,6 +6044,13 @@ 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)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 450564e28332..5344d20c9070 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8105,6 +8105,12 @@ enum hardware_error {
 #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)
-- 
2.21.3

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