Question on S3 on evergreen

[Alex Deucher]

On Fri, Oct 14, 2011 at 6:13 AM, Huang, FrankR <FrankR.Huang at amd.com> wrote:
>
>
>> -----Original Message-----
>> From: dri-devel-bounces+frankr.huang=amd.com at lists.freedesktop.org
>> [mailto:dri-devel-bounces+frankr.huang=amd.com at lists.freedesktop.org] On
>> Behalf Of Alex Deucher
>> Sent: 2011?10?13? 21:06
>> To: Huang, FrankR
>> Cc: dri-devel at lists.freedesktop.org
>> Subject: Re: Question on S3 on evergreen
>>
>> On Thu, Oct 13, 2011 at 5:54 AM, Huang, FrankR <FrankR.Huang at amd.com>
>> wrote:
>> > Hi,
>> >        I have a question on S3 suspend/resume process for evergreen
>> > chipset.
>> >        Generally introduction, I am developing WEC7 graphics driver on
>> > evergreen chipset. Alex guide me on this. And right now I move to S3
>> > part work. I have ported radeon_suspend_kms() and radeon_resume_kms()
>> > functions from linux to CE. Actually I have validated that the
>> > evergreen_suspend() and evergreen_resume() work already on CE. But when
>> > the resume work is done and the screen is shown up, I found the 3D
>> > engine works wrong. The HW acceleration of it is not correct anymore.
>> > Misrendering is happening. By tracing the root cause, I suspect that the
>> > problem may be in evergreen_gpu_init()( in evergreen_startup) call when
>> > resume(), but I am not sure. Can you guys tell me which part I should
>> > debug?
>> >        By the way, the linux kernel source I used is from 2010.10. So
>> > quite a lot patches have been committed into community during this
>> > period. Right now, the kernel source I used is around date
>> > 2011.7(Version 3.0.0). Is there any patches update for S3 during this
>> > period?
>> >
>>
>> Does soft resetting the GPU during resume help
>> (evergreen_gpu_soft_reset()) ?  If so, try updating your version of
>> evergreen_cp_resume() to the latest upstream bits.
> I have checked the code, evergreen_cp_resume() is already latest. How about evergreen_gpu_init()? I found this function call when resume will cause this misrendering. But I can not navigate the root cause.
>

Does dropping the call to evergreen_program_channel_remap() help?

Alex

> Thanks,
> Frank
>
>>
>> Alex
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