linux-kernel - Re: 3.15.0-rc2 radeon HD 7480D [Aruba] blank display

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Date:	Tue, 22 Apr 2014 01:54:01 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Ken Moffat <zarniwhoop@...world.com>
Cc:	Ed Tomlinson <edt@....ca>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: 3.15.0-rc2 radeon HD 7480D [Aruba] blank display

On Mon, Apr 21, 2014 at 10:34 PM, Ken Moffat <zarniwhoop@...world.com> wrote:
> On Tue, Apr 22, 2014 at 03:31:06AM +0100, Ken Moffat wrote:
>
> [ resending, somehow lkml dropped out of the Cc. ]
>
>> On Tue, Apr 22, 2014 at 12:19:40AM +0100, Ken Moffat wrote:
>> > On Mon, Apr 21, 2014 at 05:29:27PM -0400, Ed Tomlinson wrote:
>>
>> > > Ken,
>> > >
>> > > You might want to try reverting:
>> > >
>> > > commit 379dfc25e257ffe10eb53b86d2375f7c0f4f33ef
>> > > Author: Alex Deucher <alexdeucher@...il.com>
>> > > Date:   Mon Apr 7 10:33:46 2014 -0400
>> > >
>> > >     drm/radeon/dp: switch to the common i2c over aux code
>> > >
>> > >     Provides a nice cleanup in radeon.
>> > >
>> > >     Signed-off-by: Alex Deucher <alexander.deucher@....com>
>> > >     Signed-off-by: Christian König <christian.koenig@....com>
>> > >
>> > > This fixed a similar problem here (see the drm pull thread for rc1)
>> > >
>> > > Thanks
>> > > Ed Tomlinson
>> >
>> >  Tried reverting that from rc2, but it didn't help.  Thanks anyway.
>> >
>>
>>  Well, I *believed* I had created a patch for that commit, and
>> reverted it from -rc2 with patch -R.  But I've now bisected through
>> drivers/gpu/drm between v3.14.0 and v3.15-rc2 and the bisection
>> pointed to that same commit, so I guess I did something wrong.
>>
>>  There were a couple of other issues along the way (mounting nfs
>> hung on one commit, startx hung on several of the commits, but I've
>> marked those as "good" because I had a display, even if the system
>> was not usable).
>>
>>  I've now gone back to linus' tree that I cloned a few hours ago,
>> i.e.
>> commit c089b229dfdd09d59a11d8bc2344bf8196d575ce
>> Merge: 9ac03675010a 0565103d1adb
>> Author: Linus Torvalds <torvalds@...ux-foundation.org>
>> Date:   Mon Apr 21 10:05:35 2014 -0700
>>
>>     Merge branch 'for-linus' of
>> git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml
>>
>> created a branch, and *definitely* reverted
>> 379dfc25e257ffe10eb53b86d2375f7c0f4f33ef (using git revert) in that
>> branch.  And this version works fine.
>>
>>  So belatedly I see that I seem to have the same problem as Ed.  Or
>> at least that the same commit is causing both our problems.
>>
>>  Alex - do you need any more information from me to help with this ?

The attached patch should fix it.

Thanks,

Alex

View attachment "0001-drm-radeon-aux-fix-hpd-assignment-for-aux-bus.patch" of type "text/x-patch" (1143 bytes)