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drm/i915/fbc: don't use the frontbuffer tracking subsystem for flips 

Before this patch, page flips would call intel_frontbuffer_flip() and
intel_frontbuffer_flip_complete(), which would call intel_fbc_flush(),
which would call intel_fbc_update(). The problem is that drawing
operations also trigger intel_fbc_flush() calls, so it's not
guaranteed that we have the CRTC and FB locks grabbed when
intel_fbc_flush() happens, since the call trace may come from the
rendering path.

We're trying to make the FBC code grab the appropriate CRTC/FB locks,
so split the drawing and the flipping logic in order to achieve that
in later patches. So now the frontbuffer tracking code is just going
to be used for frontbuffer drawing, and intel_fbc_update() is going to
be used directly for actual page flips.

As a note, we don't need to call intel_fbc_flip() during the two
places where we call intel_frontbuffer_flip() since in one of them we
already have an intel_fbc_update() call, and in the other we have the
planes disabled.

Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1453210558-7875-7-git-send-email-paulo.r.zanoni@intel.com
This commit is contained in:
Paulo Zanoni 2016-01-19 11:35:39 -02:00
parent ab34a7e8b5
commit 0dd81544c9
2 changed files with 5 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/intel_display.c
View File

@ -10912,6 +10912,7 @@ static void intel_unpin_work_fn(struct work_struct *__work)
mutex_unlock(&dev->struct_mutex);
intel_frontbuffer_flip_complete(dev, to_intel_plane(primary)->frontbuffer_bit);
intel_fbc_update(crtc);
drm_framebuffer_unreference(work->old_fb);
BUG_ON(atomic_read(&crtc->unpin_work_count) == 0);

10
drivers/gpu/drm/i915/intel_fbc.c
View File

@ -989,7 +989,7 @@ void intel_fbc_invalidate(struct drm_i915_private *dev_priv,
if (!fbc_supported(dev_priv))
return;
if (origin == ORIGIN_GTT)
if (origin == ORIGIN_GTT || origin == ORIGIN_FLIP)
return;
mutex_lock(&fbc->lock);
@ -1015,7 +1015,7 @@ void intel_fbc_flush(struct drm_i915_private *dev_priv,
if (!fbc_supported(dev_priv))
return;
if (origin == ORIGIN_GTT)
if (origin == ORIGIN_GTT || origin == ORIGIN_FLIP)
return;
mutex_lock(&fbc->lock);
@ -1023,12 +1023,10 @@ void intel_fbc_flush(struct drm_i915_private *dev_priv,
fbc->busy_bits &= ~frontbuffer_bits;
if (!fbc->busy_bits && fbc->enabled) {
if (origin != ORIGIN_FLIP && fbc->active) {
if (fbc->active)
intel_fbc_recompress(dev_priv);
} else {
__intel_fbc_deactivate(dev_priv);
else
__intel_fbc_update(fbc->crtc);
}
}
mutex_unlock(&fbc->lock);