From: Matthew Auld <matthew.auld@xxxxxxxxx> 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@xxxxxxxxx> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-12-matthew.auld@xxxxxxxxx Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/intel_pm.c | 11 +++++------ 1 file 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) -- 2.14.2 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
