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drm/i915/fbc: Skip nuke when flip is pending 

Don't issue a nuke from frontbuffer flush while a flip is pending.
This avoids the DSPADDR/DSPSURF rmw abuse from the pre-snb nuke
from racing with the DSPADDR/DSPSURF write being performed by
the flip/plane update. The flip itself will already cause the nuke
so a double nuke is redundant.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220315140001.1172-4-ville.syrjala@linux.intel.com
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
This commit is contained in:
Ville Syrjälä 2022-03-15 15:59:57 +02:00
parent 529b43dfcd
commit de5bd083d2
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/i915/display/intel_fbc.c
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@ -667,6 +667,10 @@ static bool intel_fbc_is_compressing(struct intel_fbc *fbc)
static void intel_fbc_nuke(struct intel_fbc *fbc)
{
struct drm_i915_private *i915 = fbc->i915;
drm_WARN_ON(&i915->drm, fbc->flip_pending);
trace_intel_fbc_nuke(fbc->state.plane);
fbc->funcs->nuke(fbc);
@ -969,6 +973,7 @@ static void intel_fbc_update_state(struct intel_atomic_state *state,
struct intel_fbc_state *fbc_state = &fbc->state;
WARN_ON(plane_state->no_fbc_reason);
WARN_ON(fbc_state->plane && fbc_state->plane != plane);
fbc_state->plane = plane;
@ -1273,6 +1278,7 @@ static void __intel_fbc_disable(struct intel_fbc *fbc)
__intel_fbc_cleanup_cfb(fbc);
fbc->state.plane = NULL;
fbc->flip_pending = false;
fbc->busy_bits = 0;
}
@ -1367,12 +1373,12 @@ static void __intel_fbc_flush(struct intel_fbc *fbc,
if (origin == ORIGIN_FLIP || origin == ORIGIN_CURSOR_UPDATE)
goto out;
if (fbc->busy_bits)
if (fbc->busy_bits || fbc->flip_pending)
goto out;
if (fbc->active)
intel_fbc_nuke(fbc);
else if (!fbc->flip_pending)
else
__intel_fbc_post_update(fbc);
out: