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 at bwidawsk.net> --- drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_pm.c | 3 +++ 2 files changed, 4 insertions(+) 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 8a3d89e..cc67591 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3768,6 +3768,9 @@ static void haswell_init_clock_gating(struct drm_device *dev) 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. */ -- 1.8.2
