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

[Rafał Miłecki]

2013/4/21 Rafał Miłecki <zajec5 at gmail.com>:
> 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've finally managed to install, run and debug fglrx on RV620. That
> was really painful and ignoring Xorg 1.13 release in fglrx legacy
> didn't help :|
>
> Please take a look at attached log from fglrx. It seems that fglrx on
> every audio format change does:
> 1) Read audio status (R600_AUDIO_STATUS_BITS, R600_AUDIO_RATE_BPS_CHANNEL)
> 2) Writes sth to HDMI0_STATUS and HDMI0_INFOFRAME_CONTROL0
> 3) Updates audio info frame
> 4) Recalculates checksum of audio info frame
> 5) Triggers update with HDMI0_AUDIO_INFO_UPDATE bit

Btw. could we get a meaning of bit 0x100 in HDMI0_STATUS?

-- 
Rafał