Bug 28411 - Output polling causes latency every 10 seconds
Summary: Output polling causes latency every 10 seconds
Status: RESOLVED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: General (show other bugs)
Version: DRI git
Hardware: x86-64 (AMD64) Linux (All)
: medium major
Assignee: Default DRI bug account
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Reported: 2010-06-06 10:49 UTC by Marius Groeger
Modified: 2010-08-02 23:04 UTC (History)
1 user (show)

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Description Marius Groeger 2010-06-06 10:49:49 UTC 
The output polling in drm_crtc_helper.c added in this commit:

commit eb1f8e4f3be898df808e2dfc131099f5831d491d
Author: Dave Airlie <airlied@redhat.com>
Date:   Fri May 7 06:42:51 2010 +0000 

causes drm latencies every 10 seconds. I observed them in mythtv.

Apparently the dev->mode_config.mutex is held for too long; if I remove the mutex_lock/unlock for testing purposes the latencies are gone.
Comment 1 Marius Groeger 2010-07-19 00:09:58 UTC 
This is a humble *bump* on the issue - I saw that the latest d-r-t and d-n (let alone d-f) don't contain a fix for it. Anything else you need from me to fix it?
Comment 2 Marius Groeger 2010-08-02 23:04:24 UTC 
Fixed in 2.6.35 final, 29508eb66bfacdef324d2199eeaea31e0cdfaa29
drm/radeon/kms: drop taking lock around crtc lookup.

Thanks Dave!

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