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| author | Matthew Auld <matthew.auld@intel.com> | 2017-10-06 23:18:23 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2017-10-07 10:11:54 +0100 |
| commit | 8cb0983678e05939457d867e09bddb6883db5268 (patch) | |
| tree | 64b17f86907191c5a93d025745f069aca336d65d /drivers/gpu/drm/i915/intel_pm.c | |
| parent | 9a6330cff9b4b0691c7554fe873b09e7f6d377a9 (diff) | |
| download | lwn-8cb0983678e05939457d867e09bddb6883db5268.tar.gz lwn-8cb0983678e05939457d867e09bddb6883db5268.zip | |
drm/i915: disable GTT cache for 2M pages
When SW enables the use of 2M/1G pages, it must disable the GTT cache.
v2: don't disable for Cherryview which doesn't even support 48b PPGTT!
v3: explicitly check that the system does support 2M/1G pages
v4: split WA and decision logic
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-12-matthew.auld@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006221833.32439-11-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/intel_pm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pm.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 171b21f6c4ad..9d0ca2656a23 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -8453,6 +8453,9 @@ static void skl_init_clock_gating(struct drm_i915_private *dev_priv) static void bdw_init_clock_gating(struct drm_i915_private *dev_priv) { + /* The GTT cache must be disabled if the system is using 2M pages. */ + bool can_use_gtt_cache = !HAS_PAGE_SIZES(dev_priv, + I915_GTT_PAGE_SIZE_2M); enum pipe pipe; ilk_init_lp_watermarks(dev_priv); @@ -8487,12 +8490,8 @@ static void bdw_init_clock_gating(struct drm_i915_private *dev_priv) /* WaProgramL3SqcReg1Default:bdw */ gen8_set_l3sqc_credits(dev_priv, 30, 2); - /* - * WaGttCachingOffByDefault:bdw - * GTT cache may not work with big pages, so if those - * are ever enabled GTT cache may need to be disabled. - */ - I915_WRITE(HSW_GTT_CACHE_EN, GTT_CACHE_EN_ALL); + /* WaGttCachingOffByDefault:bdw */ + I915_WRITE(HSW_GTT_CACHE_EN, can_use_gtt_cache ? GTT_CACHE_EN_ALL : 0); /* WaKVMNotificationOnConfigChange:bdw */ I915_WRITE(CHICKEN_PAR2_1, I915_READ(CHICKEN_PAR2_1) |