diff options
| author | Bard Liao <yung-chuan.liao@linux.intel.com> | 2020-05-31 23:18:06 +0800 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-06-22 17:07:32 +0530 |
| commit | 929cfee314d155e61ad84a590c4080885afdb214 (patch) | |
| tree | 50159c397288ed1f0403d3628287ca4a4315efd1 | |
| parent | 908442aa67197bce1d76a6c25165bc56e2f55534 (diff) | |
| download | lwn-929cfee314d155e61ad84a590c4080885afdb214.tar.gz lwn-929cfee314d155e61ad84a590c4080885afdb214.zip | |
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>
| -rw-r--r-- | drivers/soundwire/bus.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 24ba77226376..fcfba1c38267 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; |