This allows userspace to shutdown slices at will for performance/power reasons
(because it doesn't have a use for more slices).
Cc: Dmitry Rogozhkin <dmitry.v.rogozhkin@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_engine_cs.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 402769d..17ff88d 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -628,6 +628,7 @@ static int wa_ring_whitelist_reg(struct intel_engine_cs *engine,
static int gen8_init_workarounds(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
+ int ret;
WA_SET_BIT_MASKED(INSTPM, INSTPM_FORCE_ORDERING);
@@ -673,6 +674,11 @@ static int gen8_init_workarounds(struct intel_engine_cs *engine)
GEN6_WIZ_HASHING_MASK,
GEN6_WIZ_HASHING_16x4);
+ /* Allow the UMD to configure their own power clock state */
+ ret = wa_ring_whitelist_reg(engine, GEN8_R_PWR_CLK_STATE);
+ if (ret)
+ return ret;
+
return 0;
}
@@ -841,6 +847,11 @@ static int gen9_init_workarounds(struct intel_engine_cs *engine)
if (ret)
return ret;
+ /* Allow the UMD to configure their own power clock state */
+ ret = wa_ring_whitelist_reg(engine, GEN8_R_PWR_CLK_STATE);
+ if (ret)
+ return ret;
+
return 0;
}
--
1.9.1
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