Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-23 20:51:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

soundwire: bus: fix confusion on device used by pm_runtime

Browse Source 
Intel stress-tests routinely report IO timeouts and invalid power
management transitions. Upon further analysis, we seem to be using the
wrong devices in pm_runtime calls.

Before reading and writing registers, we first need to make sure the
Slave is fully resumed. The existing code attempts to do such that,
however because of a confusion dating from 2017 and copy/paste, we
end-up resuming the parent only instead of resuming the codec device.

This can lead to accesses to the Slave registers while the bus is
still being configured and the Slave not enumerated, and as a result
IO errors occur.

This is a classic problem, similar confusions happened for HDaudio
between bus and codec device, leading to power management issues.

Fix by using the relevant device for all uses of pm_runtime functions.

Fixes: 60ee9be255 ('soundwire: bus: add PM/no-PM versions of read/write functions')
Fixes: aa79293517 ('soundwire: bus: fix io error when processing alert event')
Fixes: 9d715fa005 ('soundwire: Add IO transfer')
Reported-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210122070634.12825-9-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2021-01-22 15:06:33 +08:00 committed by Vinod Koul
parent 167790abb9
commit 973794e856
1 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/soundwire/bus.c
View File

@ -515,16 +515,16 @@ int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
{
int ret;
ret = pm_runtime_get_sync(slave->bus->dev);
ret = pm_runtime_get_sync(&slave->dev);
if (ret < 0 && ret != -EACCES) {
pm_runtime_put_noidle(slave->bus->dev);
pm_runtime_put_noidle(&slave->dev);
return ret;
}
ret = sdw_nread_no_pm(slave, addr, count, val);
pm_runtime_mark_last_busy(slave->bus->dev);
pm_runtime_put(slave->bus->dev);
pm_runtime_mark_last_busy(&slave->dev);
pm_runtime_put(&slave->dev);
return ret;
}
@ -541,16 +541,16 @@ int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
{
int ret;
ret = pm_runtime_get_sync(slave->bus->dev);
ret = pm_runtime_get_sync(&slave->dev);
if (ret < 0 && ret != -EACCES) {
pm_runtime_put_noidle(slave->bus->dev);
pm_runtime_put_noidle(&slave->dev);
return ret;
}
ret = sdw_nwrite_no_pm(slave, addr, count, val);
pm_runtime_mark_last_busy(slave->bus->dev);
pm_runtime_put(slave->bus->dev);
pm_runtime_mark_last_busy(&slave->dev);
pm_runtime_put(&slave->dev);
return ret;
}
@ -1451,7 +1451,7 @@ static int sdw_handle_slave_alerts(struct sdw_slave *slave)
ret = pm_runtime_get_sync(&slave->dev);
if (ret < 0 && ret != -EACCES) {
dev_err(&slave->dev, "Failed to resume device: %d\n", ret);
pm_runtime_put_noidle(slave->bus->dev);
pm_runtime_put_noidle(&slave->dev);
return ret;
}