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authorSanyog Kale <sanyog.r.kale@intel.com>2018-07-27 11:14:13 +0200
committerVinod Koul <vkoul@kernel.org>2018-08-27 06:19:48 +0200
commit0c4a1049cf298721eaec4553d3d5039798086e12 (patch)
treedba58261d1daf9e002055aa6388b09cd1fdec9e1 /drivers/soundwire/bus.h
parentsoundwire: Initialize completion for defer messages (diff)
downloadlinux-0c4a1049cf298721eaec4553d3d5039798086e12.tar.xz
linux-0c4a1049cf298721eaec4553d3d5039798086e12.zip
soundwire: Add support to lock across bus instances
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 <sanyog.r.kale@intel.com> Signed-off-by: Shreyas NC <shreyas.nc@intel.com> Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/soundwire/bus.h')
-rw-r--r--drivers/soundwire/bus.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h
index 3b15c4e25a3a..b6cfbdfc47d5 100644
--- a/drivers/soundwire/bus.h
+++ b/drivers/soundwire/bus.h
@@ -99,6 +99,7 @@ struct sdw_slave_runtime {
* this stream, can be zero.
* @slave_rt_list: Slave runtime list
* @port_list: List of Master Ports configured for this stream, can be zero.
+ * @stream_node: sdw_stream_runtime master_list node
* @bus_node: sdw_bus m_rt_list node
*/
struct sdw_master_runtime {
@@ -108,6 +109,7 @@ struct sdw_master_runtime {
unsigned int ch_count;
struct list_head slave_rt_list;
struct list_head port_list;
+ struct list_head stream_node;
struct list_head bus_node;
};