From: Ville Syrjälä Date: Tue, 15 Mar 2022 13:59:57 +0000 (+0200) Subject: drm/i915/fbc: Skip nuke when flip is pending X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=de5bd083d247cfcc0c21524366b473967fef7031;p=linux.git 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 Link: https://patchwork.freedesktop.org/patch/msgid/20220315140001.1172-4-ville.syrjala@linux.intel.com Reviewed-by: Mika Kahola --- diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c index f22d727949682..a4b6c8c95943c 100644 --- a/drivers/gpu/drm/i915/display/intel_fbc.c +++ b/drivers/gpu/drm/i915/display/intel_fbc.c @@ -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: