Question on S3 on evergreen

[Huang, FrankR]

> -----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.

Thanks,
Frank

> 
> Alex
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