[RFC][PATCH 1/2] drm/radeon: remove unneeded HDMI r/w ops on DCE4+

[Rafał Miłecki]

2013/10/7 Alex Deucher <alexdeucher at gmail.com>:
> On Sun, Oct 6, 2013 at 4:46 PM, Rafał Miłecki <zajec5 at gmail.com> wrote:
>> Write to HDMI_VBI_PACKET_CONTROL was duplicated.
>> Writes to AFMT_AUDIO_CRC_CONTROL and AFMT_RAMP_CONTROL[0-3] came from
>> DCE2/3 code (copy & paste) and were never needed on DCE4+.
>>
>> See https://bugzilla.kernel.org/show_bug.cgi?id=62591 for details.
>
> I think in general it would be better to do a read/modify/write
> sequences for all hdmi register updates rather than just writing.
> That's generally what the hw team recommends and what the catalyst
> driver does.

See my patch 3/2 for that :) I agree with you.