drm/i915/display: Implement Wa_14013723622

This WA fix some display glitches when the system is under high
memory pressure.

BSpec: 52890
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Tested-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210408204917.254272-1-jose.souza@intel.com

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index cbf7a60..f4a7796 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -12549,4 +12549,7 @@ enum skl_power_gate {
 #define TGL_ROOT_DEVICE_SKU_ULX                0x2
 #define TGL_ROOT_DEVICE_SKU_ULT                0x4
 
+#define CLKREQ_POLICY                  _MMIO(0x101038)
+#define  CLKREQ_POLICY_MEM_UP_OVRD     REG_BIT(1)
+
 #endif /* _I915_REG_H_ */

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3ecbd62..3f6d8b5 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7141,6 +7141,11 @@ static void gen12lp_init_clock_gating(struct drm_i915_private *dev_priv)
        /* Wa_14011059788:tgl,rkl,adl_s,dg1 */
        intel_uncore_rmw(&dev_priv->uncore, GEN10_DFR_RATIO_EN_AND_CHICKEN,
                         0, DFR_DISABLE);
+
+       /* Wa_14013723622:tgl,rkl,dg1,adl-s */
+       if (DISPLAY_VER(dev_priv) == 12)
+               intel_uncore_rmw(&dev_priv->uncore, CLKREQ_POLICY,
+                                CLKREQ_POLICY_MEM_UP_OVRD, 0);
 }
 
 static void dg1_init_clock_gating(struct drm_i915_private *dev_priv)