Bug 28411

Summary:	Output polling causes latency every 10 seconds
Product:	DRI	Reporter:	Marius Groeger <marius.groeger>
Component:	General	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:
Severity:	major
Priority:	medium	CC:	dri-devel
Version:	DRI git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

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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