We don't need to do anything for the slave if it is unattached during clock stop prepare and exit sequences.

Signed-off-by: Bard Liao yung-chuan.liao@linux.intel.com --- drivers/soundwire/bus.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 2289c2ac8c5a..405335fb790a 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -863,13 +863,13 @@ int sdw_bus_prep_clk_stop(struct sdw_bus *bus) if (!slave->dev_num) continue;

- /* Identify if Slave(s) are available on Bus */ - is_slave = true; - if (slave->status != SDW_SLAVE_ATTACHED && slave->status != SDW_SLAVE_ALERT) continue;

+ /* Identify if Slave(s) are available on Bus */ + is_slave = true; + slave_mode = sdw_get_clk_stop_mode(slave); slave->curr_clk_stop_mode = slave_mode;

@@ -900,6 +900,10 @@ int sdw_bus_prep_clk_stop(struct sdw_bus *bus) return ret; }

+ /* Don't need to inform slaves if there is no slave attached */ + if (!is_slave) + return ret; + /* Inform slaves that prep is done */ list_for_each_entry(slave, &bus->slaves, node) { if (!slave->dev_num) @@ -985,13 +989,13 @@ int sdw_bus_exit_clk_stop(struct sdw_bus *bus) if (!slave->dev_num) continue;

- /* Identify if Slave(s) are available on Bus */ - is_slave = true; - if (slave->status != SDW_SLAVE_ATTACHED && slave->status != SDW_SLAVE_ALERT) continue;

+ /* Identify if Slave(s) are available on Bus */ + is_slave = true; + mode = slave->curr_clk_stop_mode;

if (mode == SDW_CLK_STOP_MODE1) { @@ -1016,6 +1020,13 @@ int sdw_bus_exit_clk_stop(struct sdw_bus *bus) if (is_slave && !simple_clk_stop) sdw_bus_wait_for_clk_prep_deprep(bus, SDW_BROADCAST_DEV_NUM);

+ /* + * Don't need to call slave callback function if there is no slave + * attached + */ + if (!is_slave) + return 0; + list_for_each_entry(slave, &bus->slaves, node) { if (!slave->dev_num) continue;