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:
Vinod Koul
Greg Kroah-Hartman
parent
d52d7a1be0
commit
b0a9c37b01
3 changed files with 401 additions and 0 deletions
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@ -616,3 +616,382 @@ static int sdw_initialize_slave(struct sdw_slave *slave)
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return 0;
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}
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static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
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{
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u8 clear = 0, impl_int_mask;
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int status, status2, ret, count = 0;
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status = sdw_read(slave, SDW_DP0_INT);
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if (status < 0) {
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dev_err(slave->bus->dev,
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"SDW_DP0_INT read failed:%d", status);
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return status;
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}
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do {
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if (status & SDW_DP0_INT_TEST_FAIL) {
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dev_err(&slave->dev, "Test fail for port 0");
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clear |= SDW_DP0_INT_TEST_FAIL;
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}
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/*
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* Assumption: PORT_READY interrupt will be received only for
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* ports implementing Channel Prepare state machine (CP_SM)
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*/
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if (status & SDW_DP0_INT_PORT_READY) {
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complete(&slave->port_ready[0]);
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clear |= SDW_DP0_INT_PORT_READY;
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}
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if (status & SDW_DP0_INT_BRA_FAILURE) {
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dev_err(&slave->dev, "BRA failed");
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clear |= SDW_DP0_INT_BRA_FAILURE;
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}
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impl_int_mask = SDW_DP0_INT_IMPDEF1 |
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SDW_DP0_INT_IMPDEF2 | SDW_DP0_INT_IMPDEF3;
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if (status & impl_int_mask) {
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clear |= impl_int_mask;
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*slave_status = clear;
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}
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/* clear the interrupt */
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ret = sdw_write(slave, SDW_DP0_INT, clear);
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if (ret < 0) {
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dev_err(slave->bus->dev,
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"SDW_DP0_INT write failed:%d", ret);
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return ret;
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}
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/* Read DP0 interrupt again */
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status2 = sdw_read(slave, SDW_DP0_INT);
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if (status2 < 0) {
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dev_err(slave->bus->dev,
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"SDW_DP0_INT read failed:%d", status);
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return status;
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}
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status &= status2;
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count++;
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/* we can get alerts while processing so keep retrying */
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} while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
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if (count == SDW_READ_INTR_CLEAR_RETRY)
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dev_warn(slave->bus->dev, "Reached MAX_RETRY on DP0 read");
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return ret;
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}
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static int sdw_handle_port_interrupt(struct sdw_slave *slave,
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int port, u8 *slave_status)
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{
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u8 clear = 0, impl_int_mask;
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int status, status2, ret, count = 0;
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u32 addr;
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if (port == 0)
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return sdw_handle_dp0_interrupt(slave, slave_status);
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addr = SDW_DPN_INT(port);
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status = sdw_read(slave, addr);
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if (status < 0) {
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dev_err(slave->bus->dev,
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"SDW_DPN_INT read failed:%d", status);
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return status;
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}
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do {
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if (status & SDW_DPN_INT_TEST_FAIL) {
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dev_err(&slave->dev, "Test fail for port:%d", port);
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clear |= SDW_DPN_INT_TEST_FAIL;
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}
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/*
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* Assumption: PORT_READY interrupt will be received only
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* for ports implementing CP_SM.
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*/
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if (status & SDW_DPN_INT_PORT_READY) {
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complete(&slave->port_ready[port]);
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clear |= SDW_DPN_INT_PORT_READY;
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}
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impl_int_mask = SDW_DPN_INT_IMPDEF1 |
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SDW_DPN_INT_IMPDEF2 | SDW_DPN_INT_IMPDEF3;
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if (status & impl_int_mask) {
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clear |= impl_int_mask;
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*slave_status = clear;
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}
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/* clear the interrupt */
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ret = sdw_write(slave, addr, clear);
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if (ret < 0) {
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dev_err(slave->bus->dev,
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"SDW_DPN_INT write failed:%d", ret);
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return ret;
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}
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/* Read DPN interrupt again */
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status2 = sdw_read(slave, addr);
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if (status < 0) {
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dev_err(slave->bus->dev,
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"SDW_DPN_INT read failed:%d", status);
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return status;
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}
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status &= status2;
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count++;
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/* we can get alerts while processing so keep retrying */
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} while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
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if (count == SDW_READ_INTR_CLEAR_RETRY)
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dev_warn(slave->bus->dev, "Reached MAX_RETRY on port read");
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return ret;
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}
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static int sdw_handle_slave_alerts(struct sdw_slave *slave)
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{
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struct sdw_slave_intr_status slave_intr;
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u8 clear = 0, bit, port_status[15];
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int port_num, stat, ret, count = 0;
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unsigned long port;
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bool slave_notify = false;
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u8 buf, buf2[2], _buf, _buf2[2];
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sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
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/* Read Instat 1, Instat 2 and Instat 3 registers */
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ret = buf = sdw_read(slave, SDW_SCP_INT1);
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if (ret < 0) {
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dev_err(slave->bus->dev,
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"SDW_SCP_INT1 read failed:%d", ret);
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return ret;
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}
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ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, buf2);
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if (ret < 0) {
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dev_err(slave->bus->dev,
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"SDW_SCP_INT2/3 read failed:%d", ret);
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return ret;
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}
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do {
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/*
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* Check parity, bus clash and Slave (impl defined)
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* interrupt
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*/
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if (buf & SDW_SCP_INT1_PARITY) {
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dev_err(&slave->dev, "Parity error detected");
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clear |= SDW_SCP_INT1_PARITY;
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}
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if (buf & SDW_SCP_INT1_BUS_CLASH) {
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dev_err(&slave->dev, "Bus clash error detected");
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clear |= SDW_SCP_INT1_BUS_CLASH;
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}
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/*
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* When bus clash or parity errors are detected, such errors
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* are unlikely to be recoverable errors.
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* TODO: In such scenario, reset bus. Make this configurable
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* via sysfs property with bus reset being the default.
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*/
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if (buf & SDW_SCP_INT1_IMPL_DEF) {
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dev_dbg(&slave->dev, "Slave impl defined interrupt\n");
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clear |= SDW_SCP_INT1_IMPL_DEF;
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slave_notify = true;
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}
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/* Check port 0 - 3 interrupts */
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port = buf & SDW_SCP_INT1_PORT0_3;
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/* To get port number corresponding to bits, shift it */
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port = port >> SDW_REG_SHIFT(SDW_SCP_INT1_PORT0_3);
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for_each_set_bit(bit, &port, 8) {
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sdw_handle_port_interrupt(slave, bit,
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&port_status[bit]);
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}
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/* Check if cascade 2 interrupt is present */
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if (buf & SDW_SCP_INT1_SCP2_CASCADE) {
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port = buf2[0] & SDW_SCP_INTSTAT2_PORT4_10;
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for_each_set_bit(bit, &port, 8) {
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/* scp2 ports start from 4 */
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port_num = bit + 3;
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sdw_handle_port_interrupt(slave,
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port_num,
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&port_status[port_num]);
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}
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}
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/* now check last cascade */
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if (buf2[0] & SDW_SCP_INTSTAT2_SCP3_CASCADE) {
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port = buf2[1] & SDW_SCP_INTSTAT3_PORT11_14;
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for_each_set_bit(bit, &port, 8) {
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/* scp3 ports start from 11 */
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port_num = bit + 10;
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sdw_handle_port_interrupt(slave,
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port_num,
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&port_status[port_num]);
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}
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}
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/* Update the Slave driver */
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if (slave_notify && (slave->ops) &&
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(slave->ops->interrupt_callback)) {
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slave_intr.control_port = clear;
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memcpy(slave_intr.port, &port_status,
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sizeof(slave_intr.port));
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slave->ops->interrupt_callback(slave, &slave_intr);
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}
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/* Ack interrupt */
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ret = sdw_write(slave, SDW_SCP_INT1, clear);
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if (ret < 0) {
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dev_err(slave->bus->dev,
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"SDW_SCP_INT1 write failed:%d", ret);
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return ret;
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}
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/*
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* Read status again to ensure no new interrupts arrived
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* while servicing interrupts.
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*/
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ret = _buf = sdw_read(slave, SDW_SCP_INT1);
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if (ret < 0) {
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dev_err(slave->bus->dev,
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"SDW_SCP_INT1 read failed:%d", ret);
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return ret;
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}
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ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, _buf2);
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if (ret < 0) {
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dev_err(slave->bus->dev,
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"SDW_SCP_INT2/3 read failed:%d", ret);
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return ret;
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}
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/* Make sure no interrupts are pending */
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buf &= _buf;
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buf2[0] &= _buf2[0];
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buf2[1] &= _buf2[1];
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stat = buf || buf2[0] || buf2[1];
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/*
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* Exit loop if Slave is continuously in ALERT state even
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* after servicing the interrupt multiple times.
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*/
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count++;
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/* we can get alerts while processing so keep retrying */
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} while (stat != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
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if (count == SDW_READ_INTR_CLEAR_RETRY)
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dev_warn(slave->bus->dev, "Reached MAX_RETRY on alert read");
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return ret;
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}
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static int sdw_update_slave_status(struct sdw_slave *slave,
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enum sdw_slave_status status)
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{
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if ((slave->ops) && (slave->ops->update_status))
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return slave->ops->update_status(slave, status);
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return 0;
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}
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/**
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* sdw_handle_slave_status() - Handle Slave status
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* @bus: SDW bus instance
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* @status: Status for all Slave(s)
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*/
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int sdw_handle_slave_status(struct sdw_bus *bus,
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enum sdw_slave_status status[])
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{
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enum sdw_slave_status prev_status;
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struct sdw_slave *slave;
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int i, ret = 0;
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if (status[0] == SDW_SLAVE_ATTACHED) {
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ret = sdw_program_device_num(bus);
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if (ret)
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dev_err(bus->dev, "Slave attach failed: %d", ret);
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}
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/* Continue to check other slave statuses */
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for (i = 1; i <= SDW_MAX_DEVICES; i++) {
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mutex_lock(&bus->bus_lock);
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if (test_bit(i, bus->assigned) == false) {
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mutex_unlock(&bus->bus_lock);
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continue;
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}
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mutex_unlock(&bus->bus_lock);
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slave = sdw_get_slave(bus, i);
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if (!slave)
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continue;
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switch (status[i]) {
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case SDW_SLAVE_UNATTACHED:
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if (slave->status == SDW_SLAVE_UNATTACHED)
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break;
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sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
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break;
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case SDW_SLAVE_ALERT:
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ret = sdw_handle_slave_alerts(slave);
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if (ret)
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dev_err(bus->dev,
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"Slave %d alert handling failed: %d",
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i, ret);
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break;
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case SDW_SLAVE_ATTACHED:
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if (slave->status == SDW_SLAVE_ATTACHED)
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break;
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prev_status = slave->status;
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sdw_modify_slave_status(slave, SDW_SLAVE_ATTACHED);
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if (prev_status == SDW_SLAVE_ALERT)
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break;
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ret = sdw_initialize_slave(slave);
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if (ret)
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dev_err(bus->dev,
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"Slave %d initialization failed: %d",
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i, ret);
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break;
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default:
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dev_err(bus->dev, "Invalid slave %d status:%d",
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i, status[i]);
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break;
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}
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ret = sdw_update_slave_status(slave, status[i]);
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if (ret)
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dev_err(slave->bus->dev,
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"Update Slave status failed:%d", ret);
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}
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return ret;
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}
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EXPORT_SYMBOL(sdw_handle_slave_status);
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@ -49,6 +49,8 @@ int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg);
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int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
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struct sdw_defer *defer);
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#define SDW_READ_INTR_CLEAR_RETRY 10
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int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
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u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf);
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@ -330,12 +330,29 @@ struct sdw_slave_id {
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__u8 sdw_version:4;
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};
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/**
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* struct sdw_slave_intr_status - Slave interrupt status
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* @control_port: control port status
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* @port: data port status
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*/
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struct sdw_slave_intr_status {
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u8 control_port;
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u8 port[15];
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};
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/**
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* struct sdw_slave_ops - Slave driver callback ops
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* @read_prop: Read Slave properties
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* @interrupt_callback: Device interrupt notification (invoked in thread
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* context)
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* @update_status: Update Slave status
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*/
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struct sdw_slave_ops {
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int (*read_prop)(struct sdw_slave *sdw);
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int (*interrupt_callback)(struct sdw_slave *slave,
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struct sdw_slave_intr_status *status);
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int (*update_status)(struct sdw_slave *slave,
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enum sdw_slave_status status);
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};
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/**
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@ -382,6 +399,9 @@ struct sdw_driver {
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{ .mfg_id = (_mfg_id), .part_id = (_part_id), \
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.driver_data = (unsigned long)(_drv_data) }
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int sdw_handle_slave_status(struct sdw_bus *bus,
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enum sdw_slave_status status[]);
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/*
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* SDW master structures and APIs
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*/
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