[RFC PATCH 40/40] soundwire: intel: add delay on restart for enumeration

Pierre-Louis Bossart
2019-07-25T23:42:13Z

We have a conceptual issue on restart: the interaction with the slaves
can start before (re) enumeration is complete. Add a delay for now but
we will need to have an async notification that all devices are back
on the bus.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
drivers/soundwire/intel.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 1394a2322553..e4ea430b5a8e 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1242,6 +1242,11 @@ static int intel_resume(struct device *dev)

ret = sdw_cdns_exit_reset(&sdw->cdns);

+ /* add delay to let Slaves re-enumerate */
+ usleep_range(20000, 30000);
+
+ dev_dbg(dev, "%s done\n", __func__);
+
return ret;
}

--
2.20.1