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soundwire: bus: clock_stop: don't deal with UNATTACHED Slave devices 

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>
Link: https://lore.kernel.org/r/20200531151806.25951-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Bard Liao 2020-05-31 23:18:06 +08:00 committed by Vinod Koul
parent 908442aa67
commit 929cfee314
1 changed files with 17 additions and 6 deletions
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23
drivers/soundwire/bus.c
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@ -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;