[PATCH v3 11/22] soundwire: bus: check first if Slaves become UNATTACHED

From: Pierre-Louis Bossart
Date: Thu Nov 14 2019 - 13:17:53 EST


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@xxxxxxxxxxxxxxx>
---
drivers/soundwire/bus.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index b050a45d1745..9f03a915a09a 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -1034,6 +1034,24 @@ 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);
--
2.20.1