On 4/5/23 09:29, Krzysztof Kozlowski wrote:

Some Soundwire buses (like &swr0 on Qualcomm HDK8450) have two devices, which can be brought from powerdown state one after another. We need to keep enumerating them on each slave attached interrupt, otherwise only first will appear.

Cc: stable@vger.kernel.org Fixes: a6e6581942ca ("soundwire: qcom: add auto enumeration support") Signed-off-by: Krzysztof Kozlowski krzysztof.kozlowski@linaro.org

---

Cc: Patrick Lai quic_plai@quicinc.com

drivers/soundwire/qcom.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c index c296e0bf897b..1e5077d91f59 100644 --- a/drivers/soundwire/qcom.c +++ b/drivers/soundwire/qcom.c @@ -587,14 +587,9 @@ static irqreturn_t qcom_swrm_irq_handler(int irq, void *dev_id) case SWRM_INTERRUPT_STATUS_CHANGE_ENUM_SLAVE_STATUS: dev_dbg_ratelimited(swrm->dev, "SWR new slave attached\n"); swrm->reg_read(swrm, SWRM_MCP_SLV_STATUS, &slave_status);

• 		if (swrm->slave_status == slave_status) {
  

• 			dev_dbg(swrm->dev, "Slave status not changed %x\n",
  

• 				slave_status);
  

it's not clear to me how removing this test helps with the two-device configuration?

Or is this a case where the status for both devices changes at the same time but the interrupt status remains set, so the next iteration of the loop is ignored?

• 		} else {
  

• 			qcom_swrm_get_device_status(swrm);
  

• 			qcom_swrm_enumerate(&swrm->bus);
  

• 			sdw_handle_slave_status(&swrm->bus, swrm->status);
  

• 		}
  

• 		qcom_swrm_get_device_status(swrm);
  

• 		qcom_swrm_enumerate(&swrm->bus);
  

• 		sdw_handle_slave_status(&swrm->bus, swrm->status);
  	break;
  case SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET:
  	dev_err_ratelimited(swrm->dev,