By default autoenumeration is enabled on QCom SoundWire controller which means the core should not be dealing with device 0 w.r.t enumeration.
During Enumeration if SoundWire core sees status[0] as SDW_SLAVE_ATTACHED and start programming the device id, however reading DEVID registers return zeros which does not match to any of the slaves in the list and the core attempts to park this device to Group 13. This results in adding SoundWire device with enumeration address 0:0:0:0
Fix this by not passing device 0 status to SoundWire core.
Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org --- Changes since v1: - updated change log and split patch in to two as suggested by Pierre
drivers/soundwire/qcom.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c index e7f95c41eb70..d3ce580cdeaf 100644 --- a/drivers/soundwire/qcom.c +++ b/drivers/soundwire/qcom.c @@ -448,7 +448,7 @@ static void qcom_swrm_get_device_status(struct qcom_swrm_ctrl *ctrl) ctrl->reg_read(ctrl, SWRM_MCP_SLV_STATUS, &val); ctrl->slave_status = val;
- for (i = 0; i <= SDW_MAX_DEVICES; i++) { + for (i = 1; i <= SDW_MAX_DEVICES; i++) { u32 s;
s = (val >> (i * 2));