On 10/19/22 20:56, Bard Liao wrote:
From: Sjoerd Simons sjoerd@collabora.com
The bus->clk_stop_timeout member is only initialized to a non-zero value during the codec driver probe. This can lead to corner cases where this value remains pegged at zero when the bus suspends, which results in an endless loop in sdw_bus_wait_for_clk_prep_deprep().
Corner cases include configurations with no codecs described in the firmware, or delays in probing codec drivers.
Initializing the default timeout to the smallest non-zero value avoid this problem and allows for the existing logic to be preserved: the bus->clk_stop_timeout is set as the maximum required by all codecs connected on the bus.
Fixes: 1f2dcf3a154ac ("soundwire: intel: set dev_num_ida_min") Signed-off-by: Sjoerd Simons sjoerd@collabora.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Chao Song chao.song@intel.com Signed-off-by: Bard Liao yung-chuan.liao@linux.intel.com
this patch should be sent to GregKH/Linus as a 6.1-rcx fix, it does seem to make the life of Arch/Debian users less miserable - for some reason very large delays on driver probe seem to trigger this corner case and make things even worse.
see https://github.com/thesofproject/linux/issues/3777 for details.
Thanks Vinod.
drivers/soundwire/intel.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index 25ec9c272239..78d35bb4852c 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -1311,6 +1311,7 @@ static int intel_link_probe(struct auxiliary_device *auxdev, bus->link_id = auxdev->id; bus->dev_num_ida_min = INTEL_DEV_NUM_IDA_MIN;
- bus->clk_stop_timeout = 1;
sdw_cdns_probe(cdns);