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

[Alex Deucher]

On Sun, Apr 21, 2013 at 3:15 PM, Rafał Miłecki <zajec5 at gmail.com> wrote:
> 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?

There is no bit 8 defined in that register.  Also FWIW, HDMI0_STATUS
is a read only register.

Alex

>
> --
> Rafał