Background
==========
Azalia Controller fetches command and audio data via DMA and send them
to codec through SDO(Serial Data Out) lines. SDO is for outboung and it
broadcasts to all codecs. There is atleast one SDO line present, but
there can be multiple SDO lines supported for extended bandwidth. This
is essential when a platform supports multiple hdmi/dp sinks and there
is a requirement for higher resolution audio playback. In such cases
simultaneous audio playback data can be striped across multiple SDOs.
Global Capabilities(GCAP) Register indicates the capabilities of the
controller. Bits 2:1 of GCAP can be read to know the number of supported
SDO lines (below is from HD audio spec)
00: 1 SDO
01: 2 SDO
10: 4 SDO
11: Reserved
Stripe control verb reports and controls the stripe capability of an
Audio Output Converter. This verb needs to be implemented only for an
audio output converter and only if the stripe bit of the Audio Widget
Capabilities parameter is 1.
Stripe control: get code(0xf24) and set code(0x724)
Change log
==========
v1-->v2:
--------
Patch 1: "ALSA: hda: add verbs for stripe control"
* no change
Patch 2: "ALSA: hda: Add api to program stripe control bits"
* no change
Patch 3: "ALSA: hda: add register offset for stripe control"
* added mask for stripe control programming
Patch 4: "ALSA: hda: program stripe bits for controller"
* used stripe control mask instead of hard coded value
Patch 5: "ALSA: hda: program stripe control for codec"
* added conditional check to know if striping is supported.
If supported, then only stripe verb is implemented.
===========
Sameer Pujar (5):
ALSA: hda: add verbs for stripe control
ALSA: hda: Add api to program stripe control bits
ALSA: hda: add register offset for stripe control
ALSA: hda: program stripe bits for controller
ALSA: hda: program stripe control for codec
include/sound/hda_register.h | 2 ++
include/sound/hda_verbs.h | 2 ++
include/sound/hdaudio.h | 3 +++
sound/hda/hdac_stream.c | 40 ++++++++++++++++++++++++++++++++++++++++
sound/pci/hda/patch_hdmi.c | 10 +++++++++-
5 files changed, 56 insertions(+), 1 deletion(-)
--
2.7.4
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