This allows us to get the right vblank interrupt frequency.
Signed-off-by: Jesse Barnes <[email protected]>
---
drivers/gpu/drm/i915/intel_pm.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 0659317..828629b 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3687,6 +3687,13 @@ static void valleyview_init_clock_gating(struct
drm_device *dev)
PIPEA_HLINE_INT_EN | PIPEA_VBLANK_INT_EN |
SPRITEB_FLIPDONE_INT_EN | SPRITEA_FLIPDONE_INT_EN |
PLANEA_FLIPDONE_INT_EN);
+
+ /*
+ * WaDisableVLVClockGating_VBIIssue
+ * Disable clock gating on th GCFG unit to prevent a delay
+ * in the reporting of vblank events.
+ */
+ I915_WRITE(VLV_GUNIT_CLOCK_GATE, GCFG_DIS);
}
static void g4x_init_clock_gating(struct drm_device *dev)
--
1.7.9.5
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