Matthew Auld <matthew.auld@xxxxxxxxx> writes: > 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 > > Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx> > Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > --- > drivers/gpu/drm/i915/intel_pm.c | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c > index c66af09e27a7..719a1c5f1ffa 100644 > --- a/drivers/gpu/drm/i915/intel_pm.c > +++ b/drivers/gpu/drm/i915/intel_pm.c > @@ -8483,10 +8483,12 @@ static void bdw_init_clock_gating(struct drm_i915_private *dev_priv) > > /* > * WaGttCachingOffByDefault:bdw > - * GTT cache may not work with big pages, so if those > - * are ever enabled GTT cache may need to be disabled. > + * The GTT cache must be disabled if the system is planning to use > + * 2M/1G pages. s/is planning to/is using Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> > */ > - I915_WRITE(HSW_GTT_CACHE_EN, GTT_CACHE_EN_ALL); > + I915_WRITE(HSW_GTT_CACHE_EN, > + HAS_PAGE_SIZES(dev_priv, I915_GTT_PAGE_SIZE_2M) ? 0 : > + GTT_CACHE_EN_ALL); > > /* WaKVMNotificationOnConfigChange:bdw */ > I915_WRITE(CHICKEN_PAR2_1, I915_READ(CHICKEN_PAR2_1) > -- > 2.13.5 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
