https://github.com/torvalds/linux
Revision 9dbd8febb4dbc9199fcf340b882eb930e36b65b6 authored by Paulo Zanoni on 23 July 2013, 13:48:11 UTC, committed by Daniel Vetter on 07 August 2013, 09:57:06 UTC
The DRM layer keeps track of our vblanks and it assumes our vblank
counters only go back to zero when they overflow. The problem is that
when we disable the power well our counters also go to zero, but it
doesn't mean they did overflow. So on this patch we grab the lock and
update last_vblank so the DRM layer won't think our counters
overflowed.
This patch fixes the following intel-gpu-tools test:
./kms_flip --run-subtest blocking-absolute-wf_vblank
Regression introduced by the following commit:
commit bf51d5e2cda5d36d98e4b46ac7fca9461e512c41
Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date: Wed Jul 3 17:12:13 2013 -0300
drm/i915: switch disable_power_well default value to 1
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=66808
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
[danvet: Added a comment that this might be better done in
drm_vblank_post_modeset in general.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Tip revision: 9dbd8febb4dbc9199fcf340b882eb930e36b65b6 authored by Paulo Zanoni on 23 July 2013, 13:48:11 UTC
drm/i915: update last_vblank when disabling the power well
drm/i915: update last_vblank when disabling the power well
Tip revision: 9dbd8fe
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| crypto | ||
| drivers | ||
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| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
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| security | ||
| sound | ||
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