[PATCH 2/6] drm/radeon: remove HDMI interrupts on Evergreen

[Christian König]

Am 14.04.2013 20:02, schrieb Rafał Miłecki:
> 2013/4/14 Alex Deucher <alexdeucher at gmail.com>:
>> On Sun, Apr 14, 2013 at 11:55 AM, Rafał Miłecki <zajec5 at gmail.com> wrote:
>>> 2013/4/14 Alex Deucher <alexdeucher at gmail.com>:
>>>> On Sat, Apr 13, 2013 at 7:26 PM, Rafał Miłecki <zajec5 at gmail.com> wrote:
>>>>> We need interrupts on format change for R6xx only, where hardware seems
>>>>> to be somehow bugged and requires setting audio info manually.
>>>> Can you confirm that this is actually needed on older chips?  AFAIK,
>>>> it shouldn't be required for any chips.  It's mainly for debugging.
>>> I can't really right now :( My notebook with RV620 died (hard disk
>>> ended it's life and power cable got broken). I hope to resurrect him
>>> in about a week.
>>>
>>> If that isn't needed on R6xx, I'm not sure why we implemented it in
>>> first place at all. Christian? Do you have idea why this was required?
>>> I remember than in first place we were using timer, then we switched
>>> to the interrupts. But why we needed it at all?
>> I suspect it was just assumed to be necessary due to the original RE.
> I'm OK with removing that from R6xx too, if it's not needed. I just
> want to check that first, to don't break audio accidentally. In case
> of Evergreen I was able to test it, so I dares to submit this patch ;)

Well, originally I was just imitating fglrx behavior with this, but 
since I now have access to the AMD documentation I can't find a reason 
why fglrx was actually doing it like this. In theory format changes 
should work on their own, but it is still possible they did this because 
of some bug or something like this.

I can't really test it anymore either, so no idea if it is really 
required or not.

Christian.