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| author | Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2024-06-03 14:58:41 +0800 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2024-06-03 17:40:23 +0530 |
| commit | a5b7365f28c191df6b93f60942d2b9a9fe71746c (patch) | |
| tree | f98ba5554c126c0dca9daf37ccc13aaf2b4de57f /include/linux/soundwire | |
| parent | fe46d2a4301de1299fb32c0317ec316706ceaad6 (diff) | |
| download | linux-a5b7365f28c191df6b93f60942d2b9a9fe71746c.tar.gz linux-a5b7365f28c191df6b93f60942d2b9a9fe71746c.tar.bz2 linux-a5b7365f28c191df6b93f60942d2b9a9fe71746c.zip | |
soundwire: bus: add stream refcount
The notion of stream is by construction based on a multi-bus
capability, to allow for aggregation of Peripheral devices or
functions located on different segments. We currently count how many
master_rt contexts are used by a stream, but we don't have the dual
refcount of how many streams are allocated on a given bus. This
refcount will be useful to check if BTP/BRA streams can be allocated.
Note that the stream_refcount is modified in sdw_master_rt_alloc() and
sdw_master_rt_free() which are both called with the bus_lock mutex
held, so there's no need for refcount_ primitives for additional
protection.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20240603065841.4860-2-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'include/linux/soundwire')
| -rw-r--r-- | include/linux/soundwire/sdw.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index 13e96d8b7423..94fc1b57c57b 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -903,6 +903,7 @@ struct sdw_master_ops { * meaningful if multi_link is set. If set to 1, hardware-based * synchronization will be used even if a stream only uses a single * SoundWire segment. + * @stream_refcount: number of streams currently using this bus */ struct sdw_bus { struct device *dev; @@ -933,6 +934,7 @@ struct sdw_bus { u32 bank_switch_timeout; bool multi_link; int hw_sync_min_links; + int stream_refcount; }; int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent, |