[RFC PATCH] drm/radeon: program auxch directly

[Dave Airlie]

On 21 February 2015 at 03:41, Alex Deucher <alexdeucher at gmail.com> wrote:
> On Thu, Feb 19, 2015 at 7:43 PM, Alex Deucher <alexdeucher at gmail.com> wrote:
>> On Thu, Feb 19, 2015 at 6:21 PM, Dave Airlie <airlied at gmail.com> wrote:
>>> From: Dave Airlie <airlied at redhat.com>
>>>
>>> The atombios tables have an unfortunate restriction on only
>>> being able to write 12 bytes, MST really wants 16-bytes here,
>>> and since the hw can do it, we should just write directly to it.
>>>
>>> This uses a module option to allow for it now, and maybe
>>> we should provide the old code as a fallback for a while.
>>>
>>> Signed-off-by: Dave Airlie <airlied at redhat.com>
>>> ---
>>>
>>> Just putting this out there for people to know I'm doing it,
>>> most likely I'd want to merge on by default for MST systems
>>> at least.
>>>
>>> TODO: testing, irq support?
>>
>> This code will only work on DCE5+.  Things moved around on older
>> asics.  That said, DCE5 is the first asic that supports MST, so we can
>> stick with atom on the older ones.  I'm fine with enabling it for DCE5
>> and newer by default.
>
>
> I took a quick pass at cleaning this up.  See attached.

Oh this look much nicer! Thanks,

I've tested it on a couple of monitors, probably should throw a few
more things at it,

We can look into irq support later I guess, as this should unblock my mst work.

Dave.