[PATCH] drm/radeon: add very basic support for audio block on DCE6

[Rafał Miłecki]

2013/8/2 Rafał Miłecki <zajec5 at gmail.com>:
> It doesn't allow playing anything yet, but was the most tricky part to
> RE (it's indirect access, so couldn't trace it by dumping registers).
> Now we just need to implement support for HDMI blocks.

In case someone wonders, there is how I figured out that registers
offset and meaning:

WREG32(0x00005e00, 0x00000025);
RREG32(0x00005e04); -> 0x00c00000

WREG32(0x00005e00, 0x00000125);
WREG32(0x00005e04, 0x00c1005f);

RREG32(0x00012c5c); -> 0x00000000	AFMT_AUDIO_PACKET_CONTROL2
WREG32(0x00012c5c, 0x0000ff00);		AFMT_AUDIO_PACKET_CONTROL2

WREG32(0x00005e00, 0x00000027);
RREG32(0x00005e04); -> 0x00000000

WREG32(0x00005e00, 0x00000127);		0x00005f80?
WREG32(0x00005e04, 0x00000040);		0x00005f80?

WREG32(0x00005e00, 0x000c3128);		DESCRIPTOR0
WREG32(0x00005e04, 0x7f077f07);		DESCRIPTOR0

WREG32(0x00005e00, 0x00000129);		DESCRIPTOR1
WREG32(0x00005e04, 0x00500705);		DESCRIPTOR1

WREG32(0x00005e00, 0x0000012a);		DESCRIPTOR2
WREG32(0x00005e04, 0x00000000);		DESCRIPTOR2

One thing I don't understand yet is why writing to register 0x28
requires that extra 0x000c3000. It doesn't happen with any other one.

-- 
Rafał