diff options
| author | Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2022-07-14 09:10:42 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-08-17 13:00:54 +0100 |
| commit | 79fe02cb7547fcc09e83b850cfd32896d7dc6289 (patch) | |
| tree | b29795652fe551ed99807e31d0f5904d4d605f2a | |
| parent | 133547a1ef16cbdadb5c0023e5917924ae326dcc (diff) | |
| download | linux-79fe02cb7547fcc09e83b850cfd32896d7dc6289.tar.bz2 | |
soundwire: add sdw_show_ping_status() helper
This helper provides an optional delay parameter to wait for devices
to resync in case of errors, and checks that devices are indeed
attached on the bus.
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>
Acked-By: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20220714011043.46059-4-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/soundwire/bus.c | 32 | ||||
| -rw-r--r-- | include/linux/soundwire/sdw.h | 2 |
2 files changed, 34 insertions, 0 deletions
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 8d4000664fa3..d95b07896a3e 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -298,6 +298,38 @@ int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg) } /** + * sdw_show_ping_status() - Direct report of PING status, to be used by Peripheral drivers + * @bus: SDW bus + * @sync_delay: Delay before reading status + */ +void sdw_show_ping_status(struct sdw_bus *bus, bool sync_delay) +{ + u32 status; + + if (!bus->ops->read_ping_status) + return; + + /* + * wait for peripheral to sync if desired. 10-15ms should be more than + * enough in most cases. + */ + if (sync_delay) + usleep_range(10000, 15000); + + mutex_lock(&bus->msg_lock); + + status = bus->ops->read_ping_status(bus); + + mutex_unlock(&bus->msg_lock); + + if (!status) + dev_warn(bus->dev, "%s: no peripherals attached\n", __func__); + else + dev_dbg(bus->dev, "PING status: %#x\n", status); +} +EXPORT_SYMBOL(sdw_show_ping_status); + +/** * sdw_transfer_defer() - Asynchronously transfer message to a SDW Slave device * @bus: SDW bus * @msg: SDW message to be xfered diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index eb840a07c25c..822599957b35 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -922,6 +922,8 @@ int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent, struct fwnode_handle *fwnode); void sdw_bus_master_delete(struct sdw_bus *bus); +void sdw_show_ping_status(struct sdw_bus *bus, bool sync_delay); + /** * sdw_port_config: Master or Slave Port configuration * |