From: Julian Margetson <runaway@candw.ms>
To: "Michel Dänzer" <michel@daenzer.net>
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 06:36:02 -0400 [thread overview]
Message-ID: <56FBAC12.7080303@candw.ms> (raw)
In-Reply-To: <56FB4CC7.7040301@daenzer.net>
On 3/29/2016 11:49 PM, Michel Dänzer wrote:
> 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?
>
>
Thanks
No preferences .
I would be interested in a fix for the acceleration problem if possible .
I am willing to test to try to determine the exact cause if you would
direct me .
Regards
Julian
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next prev parent reply other threads:[~2016-03-30 10:36 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
2016-03-30 10:36 ` Julian Margetson [this message]
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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