[alsa-devel] [PATCH v3 0/5] Stripe control functionality

[Takashi Iwai]

On Mon, 14 Jan 2019 19:21:07 +0100,
Sameer Pujar wrote:
> 
> 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.
> 
> v2-->v3:
> -------- 
>   Patch 1: "ALSA: hda: add verbs for stripe control"
>     * no change
>   Patch 2: "ALSA: hda: Add api to program stripe control bits"
>     * added braces around stripe value calucation as per spec
>   Patch 3: "ALSA: hda: add register offset for stripe control"
>     * no change
>   Patch 4: "ALSA: hda: program stripe bits for controller"
>     * no change
>   Patch 5: "ALSA: hda: program stripe control for codec"
>     * no change
> 
> ===========
> 
> 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

Applied all five patches now.  Thanks.


Takashi