soundwire: Add slave status handling
Add status handling API sdw_handle_slave_status() to handle Slave status changes. Signed-off-by: Hardik T Shah <hardik.t.shah@intel.com> Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Acked-By: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
d52d7a1be0
commit
b0a9c37b01
|
@ -616,3 +616,382 @@ static int sdw_initialize_slave(struct sdw_slave *slave)
|
|||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
|
||||
{
|
||||
u8 clear = 0, impl_int_mask;
|
||||
int status, status2, ret, count = 0;
|
||||
|
||||
status = sdw_read(slave, SDW_DP0_INT);
|
||||
if (status < 0) {
|
||||
dev_err(slave->bus->dev,
|
||||
"SDW_DP0_INT read failed:%d", status);
|
||||
return status;
|
||||
}
|
||||
|
||||
do {
|
||||
|
||||
if (status & SDW_DP0_INT_TEST_FAIL) {
|
||||
dev_err(&slave->dev, "Test fail for port 0");
|
||||
clear |= SDW_DP0_INT_TEST_FAIL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Assumption: PORT_READY interrupt will be received only for
|
||||
* ports implementing Channel Prepare state machine (CP_SM)
|
||||
*/
|
||||
|
||||
if (status & SDW_DP0_INT_PORT_READY) {
|
||||
complete(&slave->port_ready[0]);
|
||||
clear |= SDW_DP0_INT_PORT_READY;
|
||||
}
|
||||
|
||||
if (status & SDW_DP0_INT_BRA_FAILURE) {
|
||||
dev_err(&slave->dev, "BRA failed");
|
||||
clear |= SDW_DP0_INT_BRA_FAILURE;
|
||||
}
|
||||
|
||||
impl_int_mask = SDW_DP0_INT_IMPDEF1 |
|
||||
SDW_DP0_INT_IMPDEF2 | SDW_DP0_INT_IMPDEF3;
|
||||
|
||||
if (status & impl_int_mask) {
|
||||
clear |= impl_int_mask;
|
||||
*slave_status = clear;
|
||||
}
|
||||
|
||||
/* clear the interrupt */
|
||||
ret = sdw_write(slave, SDW_DP0_INT, clear);
|
||||
if (ret < 0) {
|
||||
dev_err(slave->bus->dev,
|
||||
"SDW_DP0_INT write failed:%d", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Read DP0 interrupt again */
|
||||
status2 = sdw_read(slave, SDW_DP0_INT);
|
||||
if (status2 < 0) {
|
||||
dev_err(slave->bus->dev,
|
||||
"SDW_DP0_INT read failed:%d", status);
|
||||
return status;
|
||||
}
|
||||
status &= status2;
|
||||
|
||||
count++;
|
||||
|
||||
/* we can get alerts while processing so keep retrying */
|
||||
} while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
|
||||
|
||||
if (count == SDW_READ_INTR_CLEAR_RETRY)
|
||||
dev_warn(slave->bus->dev, "Reached MAX_RETRY on DP0 read");
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int sdw_handle_port_interrupt(struct sdw_slave *slave,
|
||||
int port, u8 *slave_status)
|
||||
{
|
||||
u8 clear = 0, impl_int_mask;
|
||||
int status, status2, ret, count = 0;
|
||||
u32 addr;
|
||||
|
||||
if (port == 0)
|
||||
return sdw_handle_dp0_interrupt(slave, slave_status);
|
||||
|
||||
addr = SDW_DPN_INT(port);
|
||||
status = sdw_read(slave, addr);
|
||||
if (status < 0) {
|
||||
dev_err(slave->bus->dev,
|
||||
"SDW_DPN_INT read failed:%d", status);
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
do {
|
||||
|
||||
if (status & SDW_DPN_INT_TEST_FAIL) {
|
||||
dev_err(&slave->dev, "Test fail for port:%d", port);
|
||||
clear |= SDW_DPN_INT_TEST_FAIL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Assumption: PORT_READY interrupt will be received only
|
||||
* for ports implementing CP_SM.
|
||||
*/
|
||||
if (status & SDW_DPN_INT_PORT_READY) {
|
||||
complete(&slave->port_ready[port]);
|
||||
clear |= SDW_DPN_INT_PORT_READY;
|
||||
}
|
||||
|
||||
impl_int_mask = SDW_DPN_INT_IMPDEF1 |
|
||||
SDW_DPN_INT_IMPDEF2 | SDW_DPN_INT_IMPDEF3;
|
||||
|
||||
|
||||
if (status & impl_int_mask) {
|
||||
clear |= impl_int_mask;
|
||||
*slave_status = clear;
|
||||
}
|
||||
|
||||
/* clear the interrupt */
|
||||
ret = sdw_write(slave, addr, clear);
|
||||
if (ret < 0) {
|
||||
dev_err(slave->bus->dev,
|
||||
"SDW_DPN_INT write failed:%d", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Read DPN interrupt again */
|
||||
status2 = sdw_read(slave, addr);
|
||||
if (status < 0) {
|
||||
dev_err(slave->bus->dev,
|
||||
"SDW_DPN_INT read failed:%d", status);
|
||||
return status;
|
||||
}
|
||||
status &= status2;
|
||||
|
||||
count++;
|
||||
|
||||
/* we can get alerts while processing so keep retrying */
|
||||
} while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
|
||||
|
||||
if (count == SDW_READ_INTR_CLEAR_RETRY)
|
||||
dev_warn(slave->bus->dev, "Reached MAX_RETRY on port read");
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int sdw_handle_slave_alerts(struct sdw_slave *slave)
|
||||
{
|
||||
struct sdw_slave_intr_status slave_intr;
|
||||
u8 clear = 0, bit, port_status[15];
|
||||
int port_num, stat, ret, count = 0;
|
||||
unsigned long port;
|
||||
bool slave_notify = false;
|
||||
u8 buf, buf2[2], _buf, _buf2[2];
|
||||
|
||||
sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
|
||||
|
||||
/* Read Instat 1, Instat 2 and Instat 3 registers */
|
||||
ret = buf = sdw_read(slave, SDW_SCP_INT1);
|
||||
if (ret < 0) {
|
||||
dev_err(slave->bus->dev,
|
||||
"SDW_SCP_INT1 read failed:%d", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, buf2);
|
||||
if (ret < 0) {
|
||||
dev_err(slave->bus->dev,
|
||||
"SDW_SCP_INT2/3 read failed:%d", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
do {
|
||||
/*
|
||||
* Check parity, bus clash and Slave (impl defined)
|
||||
* interrupt
|
||||
*/
|
||||
if (buf & SDW_SCP_INT1_PARITY) {
|
||||
dev_err(&slave->dev, "Parity error detected");
|
||||
clear |= SDW_SCP_INT1_PARITY;
|
||||
}
|
||||
|
||||
if (buf & SDW_SCP_INT1_BUS_CLASH) {
|
||||
dev_err(&slave->dev, "Bus clash error detected");
|
||||
clear |= SDW_SCP_INT1_BUS_CLASH;
|
||||
}
|
||||
|
||||
/*
|
||||
* When bus clash or parity errors are detected, such errors
|
||||
* are unlikely to be recoverable errors.
|
||||
* TODO: In such scenario, reset bus. Make this configurable
|
||||
* via sysfs property with bus reset being the default.
|
||||
*/
|
||||
|
||||
if (buf & SDW_SCP_INT1_IMPL_DEF) {
|
||||
dev_dbg(&slave->dev, "Slave impl defined interrupt\n");
|
||||
clear |= SDW_SCP_INT1_IMPL_DEF;
|
||||
slave_notify = true;
|
||||
}
|
||||
|
||||
/* Check port 0 - 3 interrupts */
|
||||
port = buf & SDW_SCP_INT1_PORT0_3;
|
||||
|
||||
/* To get port number corresponding to bits, shift it */
|
||||
port = port >> SDW_REG_SHIFT(SDW_SCP_INT1_PORT0_3);
|
||||
for_each_set_bit(bit, &port, 8) {
|
||||
sdw_handle_port_interrupt(slave, bit,
|
||||
&port_status[bit]);
|
||||
|
||||
}
|
||||
|
||||
/* Check if cascade 2 interrupt is present */
|
||||
if (buf & SDW_SCP_INT1_SCP2_CASCADE) {
|
||||
port = buf2[0] & SDW_SCP_INTSTAT2_PORT4_10;
|
||||
for_each_set_bit(bit, &port, 8) {
|
||||
/* scp2 ports start from 4 */
|
||||
port_num = bit + 3;
|
||||
sdw_handle_port_interrupt(slave,
|
||||
port_num,
|
||||
&port_status[port_num]);
|
||||
}
|
||||
}
|
||||
|
||||
/* now check last cascade */
|
||||
if (buf2[0] & SDW_SCP_INTSTAT2_SCP3_CASCADE) {
|
||||
port = buf2[1] & SDW_SCP_INTSTAT3_PORT11_14;
|
||||
for_each_set_bit(bit, &port, 8) {
|
||||
/* scp3 ports start from 11 */
|
||||
port_num = bit + 10;
|
||||
sdw_handle_port_interrupt(slave,
|
||||
port_num,
|
||||
&port_status[port_num]);
|
||||
}
|
||||
}
|
||||
|
||||
/* Update the Slave driver */
|
||||
if (slave_notify && (slave->ops) &&
|
||||
(slave->ops->interrupt_callback)) {
|
||||
slave_intr.control_port = clear;
|
||||
memcpy(slave_intr.port, &port_status,
|
||||
sizeof(slave_intr.port));
|
||||
|
||||
slave->ops->interrupt_callback(slave, &slave_intr);
|
||||
}
|
||||
|
||||
/* Ack interrupt */
|
||||
ret = sdw_write(slave, SDW_SCP_INT1, clear);
|
||||
if (ret < 0) {
|
||||
dev_err(slave->bus->dev,
|
||||
"SDW_SCP_INT1 write failed:%d", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Read status again to ensure no new interrupts arrived
|
||||
* while servicing interrupts.
|
||||
*/
|
||||
ret = _buf = sdw_read(slave, SDW_SCP_INT1);
|
||||
if (ret < 0) {
|
||||
dev_err(slave->bus->dev,
|
||||
"SDW_SCP_INT1 read failed:%d", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, _buf2);
|
||||
if (ret < 0) {
|
||||
dev_err(slave->bus->dev,
|
||||
"SDW_SCP_INT2/3 read failed:%d", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Make sure no interrupts are pending */
|
||||
buf &= _buf;
|
||||
buf2[0] &= _buf2[0];
|
||||
buf2[1] &= _buf2[1];
|
||||
stat = buf || buf2[0] || buf2[1];
|
||||
|
||||
/*
|
||||
* Exit loop if Slave is continuously in ALERT state even
|
||||
* after servicing the interrupt multiple times.
|
||||
*/
|
||||
count++;
|
||||
|
||||
/* we can get alerts while processing so keep retrying */
|
||||
} while (stat != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
|
||||
|
||||
if (count == SDW_READ_INTR_CLEAR_RETRY)
|
||||
dev_warn(slave->bus->dev, "Reached MAX_RETRY on alert read");
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int sdw_update_slave_status(struct sdw_slave *slave,
|
||||
enum sdw_slave_status status)
|
||||
{
|
||||
if ((slave->ops) && (slave->ops->update_status))
|
||||
return slave->ops->update_status(slave, status);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* sdw_handle_slave_status() - Handle Slave status
|
||||
* @bus: SDW bus instance
|
||||
* @status: Status for all Slave(s)
|
||||
*/
|
||||
int sdw_handle_slave_status(struct sdw_bus *bus,
|
||||
enum sdw_slave_status status[])
|
||||
{
|
||||
enum sdw_slave_status prev_status;
|
||||
struct sdw_slave *slave;
|
||||
int i, ret = 0;
|
||||
|
||||
if (status[0] == SDW_SLAVE_ATTACHED) {
|
||||
ret = sdw_program_device_num(bus);
|
||||
if (ret)
|
||||
dev_err(bus->dev, "Slave attach failed: %d", ret);
|
||||
}
|
||||
|
||||
/* Continue to check other slave statuses */
|
||||
for (i = 1; i <= SDW_MAX_DEVICES; i++) {
|
||||
mutex_lock(&bus->bus_lock);
|
||||
if (test_bit(i, bus->assigned) == false) {
|
||||
mutex_unlock(&bus->bus_lock);
|
||||
continue;
|
||||
}
|
||||
mutex_unlock(&bus->bus_lock);
|
||||
|
||||
slave = sdw_get_slave(bus, i);
|
||||
if (!slave)
|
||||
continue;
|
||||
|
||||
switch (status[i]) {
|
||||
case SDW_SLAVE_UNATTACHED:
|
||||
if (slave->status == SDW_SLAVE_UNATTACHED)
|
||||
break;
|
||||
|
||||
sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
|
||||
break;
|
||||
|
||||
case SDW_SLAVE_ALERT:
|
||||
ret = sdw_handle_slave_alerts(slave);
|
||||
if (ret)
|
||||
dev_err(bus->dev,
|
||||
"Slave %d alert handling failed: %d",
|
||||
i, ret);
|
||||
break;
|
||||
|
||||
case SDW_SLAVE_ATTACHED:
|
||||
if (slave->status == SDW_SLAVE_ATTACHED)
|
||||
break;
|
||||
|
||||
prev_status = slave->status;
|
||||
sdw_modify_slave_status(slave, SDW_SLAVE_ATTACHED);
|
||||
|
||||
if (prev_status == SDW_SLAVE_ALERT)
|
||||
break;
|
||||
|
||||
ret = sdw_initialize_slave(slave);
|
||||
if (ret)
|
||||
dev_err(bus->dev,
|
||||
"Slave %d initialization failed: %d",
|
||||
i, ret);
|
||||
|
||||
break;
|
||||
|
||||
default:
|
||||
dev_err(bus->dev, "Invalid slave %d status:%d",
|
||||
i, status[i]);
|
||||
break;
|
||||
}
|
||||
|
||||
ret = sdw_update_slave_status(slave, status[i]);
|
||||
if (ret)
|
||||
dev_err(slave->bus->dev,
|
||||
"Update Slave status failed:%d", ret);
|
||||
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(sdw_handle_slave_status);
|
||||
|
|
|
@ -49,6 +49,8 @@ int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg);
|
|||
int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
|
||||
struct sdw_defer *defer);
|
||||
|
||||
#define SDW_READ_INTR_CLEAR_RETRY 10
|
||||
|
||||
int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
|
||||
u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf);
|
||||
|
||||
|
|
|
@ -330,12 +330,29 @@ struct sdw_slave_id {
|
|||
__u8 sdw_version:4;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct sdw_slave_intr_status - Slave interrupt status
|
||||
* @control_port: control port status
|
||||
* @port: data port status
|
||||
*/
|
||||
struct sdw_slave_intr_status {
|
||||
u8 control_port;
|
||||
u8 port[15];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct sdw_slave_ops - Slave driver callback ops
|
||||
* @read_prop: Read Slave properties
|
||||
* @interrupt_callback: Device interrupt notification (invoked in thread
|
||||
* context)
|
||||
* @update_status: Update Slave status
|
||||
*/
|
||||
struct sdw_slave_ops {
|
||||
int (*read_prop)(struct sdw_slave *sdw);
|
||||
int (*interrupt_callback)(struct sdw_slave *slave,
|
||||
struct sdw_slave_intr_status *status);
|
||||
int (*update_status)(struct sdw_slave *slave,
|
||||
enum sdw_slave_status status);
|
||||
};
|
||||
|
||||
/**
|
||||
|
@ -382,6 +399,9 @@ struct sdw_driver {
|
|||
{ .mfg_id = (_mfg_id), .part_id = (_part_id), \
|
||||
.driver_data = (unsigned long)(_drv_data) }
|
||||
|
||||
int sdw_handle_slave_status(struct sdw_bus *bus,
|
||||
enum sdw_slave_status status[]);
|
||||
|
||||
/*
|
||||
* SDW master structures and APIs
|
||||
*/
|
||||
|
|
Loading…
Reference in a new issue