From: "Michel Dänzer" <michel@daenzer.net>
To: Julian Margetson <runaway@candw.ms>
Cc: Alex Deucher <alexander.deucher@amd.com>,
Maling list - DRI developers <dri-devel@lists.freedesktop.org>
Subject: Re: [Powerpc] Sam460ex Canyonlands issue -Kernel 4.4.6-rc1
Date: Wed, 30 Mar 2016 12:49:27 +0900 [thread overview]
Message-ID: <56FB4CC7.7040301@daenzer.net> (raw)
In-Reply-To: <56FA5107.6080305@candw.ms>
On 29.03.2016 18:55, Julian Margetson wrote:
> On 3/28/2016 11:15 PM, Michel Dänzer wrote:
>> On 29.03.2016 08:47, Julian Margetson wrote:
>>> Seeing the following when booting kernel 4.6-rc1 on Acube Sam460ex
>>> Canyonlands board.
>>> This loops for a few times then the kernel boots.
>>> No problem with the 4.6-rc1 with an A-eon Tabor Freescale e500v2 board.
>>>
>>> Regards
>>>
>>> Julian
>>>
>>>
>>> [ 2.197839] ------------[ cut here ]------------
>>> [ 2.197850] WARNING: CPU: 0 PID: 1 at
>>> drivers/gpu/drm/drm_irq.c:1368 drm_vblank_off+0x2c/0x1e0
>> That's
>>
>> if (WARN_ON(pipe >= dev->num_crtcs))
>>
>> My best guess is that drm_vblank_off is called before drm_vblank_init,
>> so dev->num_crtcs is still 0.
>>
>>
>> Please provide the full dmesg output corresponding to the problem.
>>
>>
> Attached
[...]
> [drm] radeon: irq initialized.
> [drm:r600_ring_test] *ERROR* radeon: ring 0 test failed (scratch(0x850C)=0xCAFEDEAD)
> radeon 0001:81:00.0: disabling GPU acceleration
Okay, so the problem is that acceleration fails to initialize, in which
case the driver calls drm_vblank_cleanup.
I can see two basic options for a solution: Either don't call
radeon_irq_kms_fini/drm_vblank_cleanup if acceleration fails to
initialize, or check if acceleration is enabled before calling
drm_vblank_on/off. Any preferences?
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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next prev parent reply other threads:[~2016-03-30 3:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-28 23:47 [Powerpc] Sam460ex Canyonlands issue -Kernel 4.4.6-rc1 Julian Margetson
2016-03-29 3:15 ` Michel Dänzer
2016-03-29 9:55 ` Julian Margetson
2016-03-30 3:49 ` Michel Dänzer [this message]
2016-03-30 10:36 ` Julian Margetson
2016-03-31 6:50 ` Michel Dänzer
2016-03-31 10:00 ` Julian Margetson
2016-04-01 8:31 ` Michel Dänzer
2016-04-01 10:33 ` Julian Margetson
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