[PATCH 14/49] drm/i915/bxt: add GEN8_SDEUNIT_CLOCK_GATE_DISABLE workaround

Imre Deak
2015-03-17T09:40:31Z

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
drivers/gpu/drm/i915/intel_pm.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3d4a7c3..d5dd0b3 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -96,7 +96,18 @@ static void skl_init_clock_gating(struct drm_device *dev)

static void bxt_init_clock_gating(struct drm_device *dev)
{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
gen9_init_clock_gating(dev);
+
+ /*
+ * FIXME:
+ * GEN8_SDEUNIT_CLOCK_GATE_DISABLE applies on A0 only.
+ */
+ /* WaDisableSDEUnitClockGating:bxt */
+ I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
+ GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+
}

static void i915_pineview_get_mem_freq(struct drm_device *dev)
--
2.1.0