Bug 95467 - GPU hangs in v4.6 on CHT
Summary: GPU hangs in v4.6 on CHT
Status: CLOSED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: XOrg git
Hardware: Other All
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-05-18 00:03 UTC by Pierre Bossart
Modified: 2017-07-24 22:41 UTC (History)
1 user (show)

See Also:
i915 platform: BSW/CHT
i915 features: GPU hang

Attachments
dmesg log for first test (62.28 KB, text/x-log)
2016-05-18 00:03 UTC, Pierre Bossart 		no flags Details
log from /sys/class/drm/card0/error (57.29 KB, application/gzip)
2016-05-18 00:04 UTC, Pierre Bossart 		no flags Details
dmesg for second test (65.00 KB, text/x-log)
2016-05-18 00:05 UTC, Pierre Bossart 		no flags Details
error for second test (57.92 KB, application/gzip)
2016-05-18 00:05 UTC, Pierre Bossart 		no flags Details
View All

Description Pierre Bossart 2016-05-18 00:03:38 UTC 
Created attachment 123857 [details]
dmesg log for first test

V4.5 works fine on CHT (Tronsmart Ara X5 Plus)
V4.6 is broken, UI is frozen in less than 20 seconds when moving windows around.

the drm-intel-nightly works fine, apparently due to this commit:

commit a5e485a95c9c4cdd93b4c6dc53eee3bd1e50de11
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Wed Apr 13 21:19:51 2016 +0300

    drm/i915: Clear VLV_IER around irq processing


Attached results of 2 tests which show similar behavior.
Comment 1 Pierre Bossart 2016-05-18 00:04:42 UTC 
Created attachment 123858 [details]
log from /sys/class/drm/card0/error
Comment 2 Pierre Bossart 2016-05-18 00:05:08 UTC 
Created attachment 123859 [details]
dmesg for second test
Comment 3 Pierre Bossart 2016-05-18 00:05:33 UTC 
Created attachment 123860 [details]
error for second test
Comment 4 Pierre Bossart 2016-05-18 20:21:14 UTC 
The commit 9dbaab56ac09 ("drm/i915: Exit cherryview_irq_handler() after one pass"
seems to be the root cause.

git revert 9dbaab56ac09 works fine on top of v4.6 on my Tronsmart Ara X5 Plus
Comment 5 Chris Wilson 2017-02-04 20:43:13 UTC 
commit dd218276595f35a9a3e2fe1d0f1ed34634cac623
Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date:   Wed Jun 22 15:23:03 2016 -0700

    Revert "drm/i915: Exit cherryview_irq_handler() after one pass"
    
    This reverts commit 9dbaab56ac09f07a73fe83bf69bec3e31060080a.
    
    Turns out it was a bad idea and was fixed up "properly" in 4.7 but those
    patches are too big to put into 4.6, so let's just revert it for now.
    
    Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
    Cc: Daniel Vetter <daniel@ffwll.ch>
    Cc: Peter Frühberger <peter.fruehberger@gmail.com>
    Cc: Chris Wilson <chris@chris-wilson.co.uk>
    Cc: Jani Nikula <jani.nikula@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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