From: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com
Some Slaves report incorrect information in their interrupt status registers after a master/bus reset, track the initial interrupt handling so that quirks can be introduced to filter out incorrect information while keeping interrupts enabled in steady state.
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Kai Vehmanen kai.vehmanen@linux.intel.com Reviewed-by: Guennadi Liakhovetski guennadi.liakhovetski@linux.intel.com Signed-off-by: Bard Liao yung-chuan.liao@linux.intel.com --- drivers/soundwire/bus.c | 7 ++++++- drivers/soundwire/slave.c | 1 + include/linux/soundwire/sdw.h | 3 +++ 3 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 029818b1f568..30b0bed16630 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -1472,6 +1472,9 @@ static int sdw_handle_slave_alerts(struct sdw_slave *slave) goto io_err; }
+ /* at this point all initial interrupt sources were handled */ + slave->first_interrupt_done = true; + /* * Read status again to ensure no new interrupts arrived * while servicing interrupts. @@ -1674,8 +1677,10 @@ void sdw_clear_slave_status(struct sdw_bus *bus, u32 request) if (!slave) continue;
- if (slave->status != SDW_SLAVE_UNATTACHED) + if (slave->status != SDW_SLAVE_UNATTACHED) { sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED); + slave->first_interrupt_done = false; + }
/* keep track of request, used in pm_runtime resume */ slave->unattach_request = request; diff --git a/drivers/soundwire/slave.c b/drivers/soundwire/slave.c index 2191dd6e7aa4..4a250d33de5d 100644 --- a/drivers/soundwire/slave.c +++ b/drivers/soundwire/slave.c @@ -58,6 +58,7 @@ static int sdw_slave_add(struct sdw_bus *bus, slave->dev_num = 0; init_completion(&slave->probe_complete); slave->probed = false; + slave->first_interrupt_done = false;
for (i = 0; i < SDW_MAX_PORTS; i++) init_completion(&slave->port_ready[i]); diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index 9d94cdf6346f..2b93a8ef7fad 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -616,6 +616,8 @@ struct sdw_slave_ops { * between the Master suspending and the codec resuming, and make sure that * when the Master triggered a reset the Slave is properly enumerated and * initialized + * @first_interrupt_done: status flag tracking if the interrupt handling + * for a Slave happens for the first time after enumeration */ struct sdw_slave { struct sdw_slave_id id; @@ -637,6 +639,7 @@ struct sdw_slave { struct completion enumeration_complete; struct completion initialization_complete; u32 unattach_request; + bool first_interrupt_done; };
#define dev_to_sdw_dev(_dev) container_of(_dev, struct sdw_slave, dev)