Unverified Commit 79fe02cb authored by Pierre-Louis Bossart's avatar Pierre-Louis Bossart Committed by Mark Brown
Browse files

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: default avatarPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: default avatarRander Wang <rander.wang@intel.com>
Signed-off-by: default avatarBard Liao <yung-chuan.liao@linux.intel.com>
Acked-By: default avatarVinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20220714011043.46059-4-yung-chuan.liao@linux.intel.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 133547a1

drivers/soundwire/bus.c

+32 −0
Original line number Diff line number Diff line
@@ -297,6 +297,38 @@ int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg) 
	return ret;

}



/**

 * 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

include/linux/soundwire/sdw.h

+2 −0
Original line number Diff line number Diff line
@@ -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

 *