[SRU][Precise][PATCH 0/1] drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2)

[Luis Henriques]

On Mon, Oct 08, 2012 at 02:53:42PM +0100, Luis Henriques wrote:
> BugLink: http://bugs.launchpad.net/bugs/1058303
> 
> == SRU Justification ==
> 
> A regression has been traced back to commit
> be05980391dd7c9f3557b5aa529de807dfc911bd (commit
> 81ee8fb6b52ec69eeed37fe7943446af1dccecc5 upstream).  This bug affects some users
> using the radeon evergreen gpu and has been fixed upstream but didn't made its
> way to stable yet.
> 
> == Fix ==
> 
> In order to completely fix the issue, the following commits would be required in
> Precise:
> 
> 3ae19b750bdc09ce233e1504348320141593ffda drm/radeon/kms: add wait_for_vblank asic callback
> 89e5181f3f79fbe46dbf811f9bc470f524704450 drm/radeon/kms: add a radeon asic callback for mc idle
> 8848f759c0de139bada271aa446f48637c98ca1a drm/radeon/kms: add trinity (TN) chip family
> 4a15903db02026728d0cf2755c6fabae16b8db6a drm/radeon/dce4+: don't use radeon_crtc for vblank callback
> 62444b7462a2b98bc78d68736c03a7c4e66ba7e2 drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2)
> 
> Since this would introduce a big code churn, only the last one (commit
> 62444b7462a2b98bc78d68736c03a7c4e66ba7e2) has been picked.  This backport
> includes all the missing bits from the other commits.
> 
> == Impact ==
> 
> Users with the affected hardware will fail to boot.  Here's an example of an
> lspci for an affected gpu:
> 
> 00:01.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Wrestler [Radeon HD 6320] [1002:9806] (prog-if 00 [VGA controller])

I forgot to mention that this *may* also affect Oneiric.  Since we
don't have any bug reports (yet?), we may prefer to wait for a stable
update that includes this patch already.

Cheers,
--
Luis

> 
> == Test Case ==
> 
> Reboot a system using the affected hardware.
> 
> Alex Deucher (1):
>   drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2)
> 
>  drivers/gpu/drm/radeon/evergreen.c     |  185 ++++++++++++++++----------------
>  drivers/gpu/drm/radeon/evergreen_reg.h |    3 +
>  drivers/gpu/drm/radeon/evergreend.h    |    7 ++
>  drivers/gpu/drm/radeon/radeon_asic.h   |    1 +
>  4 files changed, 105 insertions(+), 91 deletions(-)
> 
> -- 
> 1.7.10.4
> 
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