drm/i915/kbl: Add WaDisableGamClockGating
According to bspec we need to disable gam unit clock gating on
on kbl revids A0 and B0.
References: HSD#2226858, HSD#1944358
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1465309159-30531-14-git-send-email-mika.kuoppala@intel.com
(cherry picked from commit 8aeb7f624fbf8a68a9c67f831d4158a0f80ea920)
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index d014b8f..3e16b9d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6926,6 +6926,7 @@
#define EDRAM_SETS_IDX(cap) (((cap) >> 8) & 0x3)
#define GEN6_UCGCTL1 _MMIO(0x9400)
+# define GEN6_GAMUNIT_CLOCK_GATE_DISABLE (1 << 22)
# define GEN6_EU_TCUNIT_CLOCK_GATE_DISABLE (1 << 16)
# define GEN6_BLBUNIT_CLOCK_GATE_DISABLE (1 << 5)
# define GEN6_CSUNIT_CLOCK_GATE_DISABLE (1 << 7)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 7ae5bfd..3f0f188 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6722,6 +6722,11 @@
if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_B0))
I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+
+ /* WaDisableGamClockGating:kbl */
+ if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_B0))
+ I915_WRITE(GEN6_UCGCTL1, I915_READ(GEN6_UCGCTL1) |
+ GEN6_GAMUNIT_CLOCK_GATE_DISABLE);
}
static void skylake_init_clock_gating(struct drm_device *dev)
