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>
1 parent 0ce99f7
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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accounting | ||
acpi | ||
aoe | ||
arm | ||
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auxdisplay | ||
backlight | ||
blackfin | ||
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bus-devices | ||
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cgroups | ||
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cpu-freq | ||
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