diff options
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 2 |
2 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 4a446b116e6a..96fb0fa47c40 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -579,6 +579,7 @@ #define DPFC_CTL_PLANEA (0<<30) #define DPFC_CTL_PLANEB (1<<30) #define DPFC_CTL_FENCE_EN (1<<29) +#define DPFC_CTL_PERSISTENT_MODE (1<<25) #define DPFC_SR_EN (1<<10) #define DPFC_CTL_LIMIT_1X (0<<6) #define DPFC_CTL_LIMIT_2X (1<<6) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 31c75266a456..9df96bdc002e 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1581,6 +1581,8 @@ static void ironlake_enable_fbc(struct drm_crtc *crtc, unsigned long interval) dpfc_ctl &= DPFC_RESERVED; dpfc_ctl |= (plane | DPFC_CTL_LIMIT_1X); + /* Set persistent mode for front-buffer rendering, ala X. */ + dpfc_ctl |= DPFC_CTL_PERSISTENT_MODE; dpfc_ctl |= (DPFC_CTL_FENCE_EN | dev_priv->cfb_fence); I915_WRITE(ILK_DPFC_CHICKEN, DPFC_HT_MODIFY); |