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soundwire: add sdw_show_ping_status() helper

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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>
This commit is contained in:
Pierre-Louis Bossart 2022-07-14 09:10:42 +08:00 committed by Mark Brown
parent 133547a1ef
commit 79fe02cb75
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GPG key ID: 24D68B725D5487D0
2 changed files with 34 additions and 0 deletions
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32
drivers/soundwire/bus.c
View file

@ -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

2
include/linux/soundwire/sdw.h
View file

@ -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
*