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soundwire: slave: add first_interrupt_done status

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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>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20200908134521.6781-4-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-09-08 21:45:17 +08:00 committed by Vinod Koul
parent 310f6dc6dc
commit c2819e196b
3 changed files with 10 additions and 1 deletions
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7
drivers/soundwire/bus.c
View File

@ -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;

1
drivers/soundwire/slave.c
View File

@ -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]);

3
include/linux/soundwire/sdw.h
View File

@ -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)