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drm/i915: only recompress FBC after flushing a drawing operation 

There's no need to stop and restart FBC, which is quite expensive as
we have to revalidate the CRTC state. After flushing a drawing
operation we know the CRTC state hasn't changed, so a nuke
(recompress) should be fine.

v2: Make it simpler (Chris).
v3: Rewrite the patch again due to patch order changes.
v4: Rewrite commit message (Chris).

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/
This commit is contained in:
Paulo Zanoni 2015-11-11 14:46:22 -02:00
parent 820bcabbf0
commit ee7d6cfa4b
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/i915/intel_fbc.c
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@ -935,8 +935,12 @@ void intel_fbc_flush(struct drm_i915_private *dev_priv,
dev_priv->fbc.busy_bits &= ~frontbuffer_bits;
if (!dev_priv->fbc.busy_bits && dev_priv->fbc.enabled) {
__intel_fbc_deactivate(dev_priv);
__intel_fbc_update(dev_priv->fbc.crtc);
if (origin != ORIGIN_FLIP && dev_priv->fbc.active) {
intel_fbc_recompress(dev_priv);
} else {
__intel_fbc_deactivate(dev_priv);
__intel_fbc_update(dev_priv->fbc.crtc);
}
}
mutex_unlock(&dev_priv->fbc.lock);