drm/i915: Implement WaSwitchSolVfFArbitrationPriority
Bspec mentions this for HSW+. I can't quite tell what the effects are,
and I don't easily have a way to test this.
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 50dba38..bceca11 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -121,6 +121,7 @@
#define GAM_ECOCHK 0x4090
#define ECOCHK_SNB_BIT (1<<10)
+#define HSW_ECOCHK_ARB_PRIO_SOL (1<<6)
#define ECOCHK_PPGTT_CACHE64B (0x3<<3)
#define ECOCHK_PPGTT_CACHE4B (0x0<<3)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 234f741..ce3db2c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3770,6 +3770,9 @@
I915_WRITE(GEN6_MBCTL, I915_READ(GEN6_MBCTL) |
GEN6_MBCTL_ENABLE_BOOT_FETCH);
+ /* WaSwitchSolVfFArbitrationPriority */
+ I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);
+
/* XXX: This is a workaround for early silicon revisions and should be
* removed later.
*/
