15-rc1: radeon modesetting fails

[Christian König]

Hi Borislav,

thanks for the logs, those were indeed quite helpful.

Attached are two patches, the first one tries to solve the problem by 
increasing the accuracy of the parameters if we don't match exactly and 
the second improves the logging of the calculation process by dumping a 
bunch of intermediate values used.

Please apply both on top of my drm-fixes-3.15-wip branch you are already 
using, if the first one doesn't solve the problem then please provide 
new dmesg logs with drm.debug=0xE.

Thanks in advance,
Christian.

Am 15.04.2014 16:24, schrieb Borislav Petkov:
> On Tue, Apr 15, 2014 at 03:09:02PM +0200, Christian König wrote:
>>> Does reverting:
>>> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=32167016076f714f0e35e287fbead7de0f1fb179
>>> fix the issue?  We may need to tweak the pll parameters for older asics.
>> Yeah, indeed the most likely cause. Please provide dmesg outputs created
>> with drm.ebug=0xe for the old and the new kernel.
> Hey, I finally haz 15-rc1+ running here. And I can even see something!
>
> :-)
>
> Ok, so I reverted 32167016076f ontop of Christian's drm-fixes-3.15-wip
> branch which didn't apply cleanly. So I ended up fixing the conflicts
> and got the revert below.
>
> With it, the machine booted fine, so it looks like the revert worked.
>
> Christian, I'm sending dmesg outputs in another private mail to you
> guys.
>
> Thanks.
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