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soundwire: bus: check first if Slaves become UNATTACHED 

Before checking for the presence of Device0, we first need to clean-up
the internal state of Slaves that are no longer attached.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200110215731.30747-7-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-01-10 15:57:31 -06:00 committed by Vinod Koul
parent 7181b1d41d
commit 6106190158
1 changed files with 18 additions and 0 deletions
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18
drivers/soundwire/bus.c
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@ -979,6 +979,24 @@ int sdw_handle_slave_status(struct sdw_bus *bus,
struct sdw_slave *slave;
int i, ret = 0;
/* first check if any Slaves fell off the bus */
for (i = 1; i <= SDW_MAX_DEVICES; i++) {
mutex_lock(&bus->bus_lock);
if (test_bit(i, bus->assigned) == false) {
mutex_unlock(&bus->bus_lock);
continue;
}
mutex_unlock(&bus->bus_lock);
slave = sdw_get_slave(bus, i);
if (!slave)
continue;
if (status[i] == SDW_SLAVE_UNATTACHED &&
slave->status != SDW_SLAVE_UNATTACHED)
sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
}
if (status[0] == SDW_SLAVE_ATTACHED) {
dev_dbg(bus->dev, "Slave attached, programming device number\n");
ret = sdw_program_device_num(bus);