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soundwire: stream: add helper to startup/shutdown streams

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To handle streams at the dailink level, expose two helpers that will
be called from machine drivers.

Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200630184356.24939-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart
2020-07-01 02:43:53 +08:00
committed by Vinod Koul
parent 09553140c8
commit 4550569bd7
3 changed files with 110 additions and 1 deletions
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11
Documentation/driver-api/soundwire/stream.rst
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@@ -293,6 +293,10 @@ per stream. From ASoC DPCM framework, this stream state maybe linked to
int sdw_alloc_stream(char * stream_name);
The SoundWire core provides a sdw_startup_stream() helper function,
typically called during a dailink .startup() callback, which performs
stream allocation and sets the stream pointer for all DAIs
connected to a stream.
SDW_STREAM_CONFIGURED
~~~~~~~~~~~~~~~~~~~~~
@@ -509,7 +513,12 @@ In .shutdown() the data structure maintaining stream state are freed up.
void sdw_release_stream(struct sdw_stream_runtime * stream);
Not Supported
The SoundWire core provides a sdw_shutdown_stream() helper function,
typically called during a dailink .shutdown() callback, which clears
the stream pointer for all DAIS connected to a stream and releases the
memory allocated for the stream.
Not Supported
=============
1. A single port with multiple channels supported cannot be used between two