[PATCH 04/12] drm/i915: Implement WaDisableSDEUnitClockGating:bdw

Ben Widawsky
2014-03-21T18:48:28Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[BDW 3.14 backport]
Cc: stable@vger.kernel.org
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_pm.c | 4 ++++
2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1240250..db70031 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4868,6 +4868,9 @@
#define GEN7_UCGCTL4 0x940c
#define GEN7_L3BANK2X_CLOCK_GATE_DISABLE (1<<25)

+#define GEN8_UCGCTL6 0x9430
+#define GEN8_SDEUNIT_CLOCK_GATE_DISABLE (1<<14)
+
#define GEN6_RPNSWREQ 0xA008
#define GEN6_TURBO_DISABLE (1<<31)
#define GEN6_FREQUENCY(x) ((x)<<25)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 7b79c18..a0c6add 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4758,6 +4758,10 @@ static void gen8_init_clock_gating(struct drm_device *dev)

I915_WRITE(GEN6_RC_SLEEP_PSMI_CONTROL,
_MASKED_BIT_ENABLE(GEN8_RC_SEMA_IDLE_MSG_DISABLE));
+
+ /* WaDisableSDEUnitClockGating:bdw */
+ I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
+ GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
}

static void haswell_init_clock_gating(struct drm_device *dev)
--
1.9.1

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