kernel/linux.git/drivers/soundwire/stream.c, branch linux-4.20.y

soundwire: keep track of Masters in a stream

2018-08-27T04:19:48+00:00

A multi link bankswitch can be done if the hardware supports and the stream is handled by multiple Master(s). This preparatory patch adds support to track m_rt in a stream. Modifying m_rt_count and usage is added as part of the next patch. Signed-off-by: Shreyas NC Acked-by: Pierre-Louis Bossart Signed-off-by: Vinod Koul

soundwire: Add support for multi link bank switch

2018-08-27T04:19:48+00:00

In cases of multiple Masters in a stream, synchronization between multiple Master(s) is achieved by performing bank switch together and using Master methods. Add sdw_ml_bank_switch() to wait for completion of bank switch. Signed-off-by: Sanyog Kale Signed-off-by: Shreyas NC Acked-by: Pierre-Louis Bossart Signed-off-by: Vinod Koul

soundwire: Handle multiple master instances in a stream

2018-08-27T04:19:48+00:00

For each SoundWire stream operation, we need to parse master list and operate upon all master runtime. This is a preparatory patch to do the boilerplate conversion of stream handling from single master runtime to handle a list of master runtime. The code to support bank switch for multiple master instances is added in the next patch. Signed-off-by: Sanyog Kale Signed-off-by: Shreyas NC Acked-by: Pierre-Louis Bossart Signed-off-by: Vinod Koul

soundwire: Add support to lock across bus instances

2018-08-27T04:19:48+00:00

Currently, the stream concept is limited to single Master and one or more Codecs. This patch extends the concept to support multiple Master(s) sharing the same reference clock and synchronized in the hardware. Modify sdw_stream_runtime to support a list of sdw_master_runtime for the same. The existing reference to a single m_rt is removed in the next patch. Typically to lock, one would acquire a global lock and then lock bus instances. In this case, the caller framework(ASoC DPCM) guarantees that stream operations on a card are always serialized. So, there is no race condition and hence no need for global lock. Bus lock(s) are acquired to reconfigure the bus while the stream is set-up. So, we add sdw_acquire_bus_lock()/sdw_release_bus_lock() APIs which are used only to reconfigure the bus. Signed-off-by: Sanyog Kale Signed-off-by: Shreyas NC Acked-by: Pierre-Louis Bossart Signed-off-by: Vinod Koul

soundwire: Fix acquiring bus lock twice during master release

2018-08-27T04:19:48+00:00

As part of sdw_stream_remove_master(), sdw_stream_remove_slave() is called which results in bus lock being acquired twice. So, fix it by performing specific Slave remove operations in sdw_release_master_stream() instead of calling sdw_stream_remove_slave(). Signed-off-by: Sanyog Kale Signed-off-by: Shreyas NC Acked-by: Pierre-Louis Bossart Signed-off-by: Vinod Koul

soundwire: Fix incorrect exit after configuring stream

2018-08-27T04:19:48+00:00

In sdw_stream_add_master() after the Master ports are configured, the stream is released incorrectly. So, fix it by avoiding stream release after configuring the Master for the stream. While at it, rename the label appropriately. Signed-off-by: Shreyas NC Acked-by: Pierre-Louis Bossart Signed-off-by: Vinod Koul

soundwire: Fix duplicate stream state assignment

2018-08-27T04:19:48+00:00

For a SoundWire stream it is expected that a Slave is added to the stream before Master is added. So, move the stream state to CONFIGURED after the first Slave is added and remove the stream state assignment for Master add. Along with these changes, add additional comments to explain the same. Signed-off-by: Shreyas NC Acked-by: Pierre-Louis Bossart Signed-off-by: Vinod Koul

docs: Fix more broken references

2018-06-15T21:11:26+00:00

As we move stuff around, some doc references are broken. Fix some of them via this script: ./scripts/documentation-file-ref-check --fix Manually checked that produced results are valid. Acked-by: Matthias Brugger Acked-by: Takashi Iwai Acked-by: Jeff Kirsher Acked-by: Guenter Roeck Acked-by: Miguel Ojeda Signed-off-by: Mauro Carvalho Chehab Acked-by: Jonathan Corbet

soundwire: Add stream configuration APIs

2018-05-11T16:17:06+00:00

Add APIs for prepare, enable, disable and de-prepare stream. Signed-off-by: Sanyog Kale Signed-off-by: Shreyas NC Signed-off-by: Vinod Koul

soundwire: Add bank switch routine

2018-05-11T16:17:05+00:00

SoundWire supports two registers banks. So, program the alternate bank with new configuration and then performs bank switch. Signed-off-by: Sanyog Kale Signed-off-by: Shreyas NC Signed-off-by: Vinod Koul