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 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
