[PATCH 2/3] drm/i915/psr: Implement WA 1130

[José Roberto de Souza]

Render modifications could not trigger PSR exit this WA fixes it.

BSpec: 21664
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h | 1 +
 drivers/gpu/drm/i915/intel_pm.c | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 87f034b22f0d..200ae3bd88ce 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4138,6 +4138,7 @@ enum {
 #define   TGL_VRH_GATING_DIS		REG_BIT(31)
 
 #define GEN9_CLKGATE_DIS_4		_MMIO(0x4653C)
+#define   BXT_DPFC_GATING_DIS		(1 << 31)
 #define   BXT_GMBUS_GATING_DIS		(1 << 14)
 
 #define _CLKGATE_DIS_PSL_A		0x46520
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 8375054ba27d..02184888d193 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -139,6 +139,10 @@ static void bxt_init_clock_gating(struct drm_i915_private *dev_priv)
 	 * application, using batch buffers or any other means.
 	 */
 	I915_WRITE(RM_TIMEOUT, MMIO_TIMEOUT_US(950));
+
+	/* WA 1130 */
+	I915_WRITE(GEN9_CLKGATE_DIS_4,
+		   I915_READ(GEN9_CLKGATE_DIS_4) | BXT_DPFC_GATING_DIS);
 }
 
 static void glk_init_clock_gating(struct drm_i915_private *dev_priv)
@@ -152,6 +156,10 @@ static void glk_init_clock_gating(struct drm_i915_private *dev_priv)
 	 */
 	I915_WRITE(GEN9_CLKGATE_DIS_0, I915_READ(GEN9_CLKGATE_DIS_0) |
 		   PWM1_GATING_DIS | PWM2_GATING_DIS);
+
+	/* WA 1130 */
+	I915_WRITE(GEN9_CLKGATE_DIS_4,
+		   I915_READ(GEN9_CLKGATE_DIS_4) | BXT_DPFC_GATING_DIS);
 }
 
 static void pnv_get_mem_freq(struct drm_i915_private *dev_priv)
-- 
2.26.0