Wait for Fifo to be empty before going to suspend or before bank switch happens. Just to make sure that all the reads/writes are done. Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx> --- drivers/soundwire/qcom.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c index b2363839624c..465b2a2ef0d5 100644 --- a/drivers/soundwire/qcom.c +++ b/drivers/soundwire/qcom.c @@ -325,6 +325,32 @@ static int swrm_wait_for_wr_fifo_avail(struct qcom_swrm_ctrl *swrm) return 0; } +static bool swrm_wait_for_wr_fifo_done(struct qcom_swrm_ctrl *swrm) +{ + u32 fifo_outstanding_cmds, value; + int fifo_retry_count = SWR_OVERFLOW_RETRY_COUNT; + + /* Check for fifo overflow during write */ + swrm->reg_read(swrm, SWRM_CMD_FIFO_STATUS, &value); + fifo_outstanding_cmds = FIELD_GET(SWRM_WR_CMD_FIFO_CNT_MASK, value); + + if (fifo_outstanding_cmds) { + while (fifo_retry_count) { + usleep_range(500, 510); + swrm->reg_read(swrm, SWRM_CMD_FIFO_STATUS, &value); + fifo_outstanding_cmds = FIELD_GET(SWRM_WR_CMD_FIFO_CNT_MASK, value); + fifo_retry_count--; + if (fifo_outstanding_cmds == 0) + return true; + } + } else { + return true; + } + + + return false; +} + static int qcom_swrm_cmd_fifo_wr_cmd(struct qcom_swrm_ctrl *swrm, u8 cmd_data, u8 dev_addr, u16 reg_addr) { @@ -356,6 +382,7 @@ static int qcom_swrm_cmd_fifo_wr_cmd(struct qcom_swrm_ctrl *swrm, u8 cmd_data, usleep_range(150, 155); if (cmd_id == SWR_BROADCAST_CMD_ID) { + swrm_wait_for_wr_fifo_done(swrm); /* * sleep for 10ms for MSM soundwire variant to allow broadcast * command to complete. @@ -1122,6 +1149,7 @@ static void qcom_swrm_shutdown(struct snd_pcm_substream *substream, { struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dai->dev); + swrm_wait_for_wr_fifo_done(ctrl); sdw_release_stream(ctrl->sruntime[dai->id]); ctrl->sruntime[dai->id] = NULL; pm_runtime_mark_last_busy(ctrl->dev); @@ -1558,6 +1586,7 @@ static int __maybe_unused swrm_runtime_suspend(struct device *dev) struct qcom_swrm_ctrl *ctrl = dev_get_drvdata(dev); int ret; + swrm_wait_for_wr_fifo_done(ctrl); if (!ctrl->clock_stop_not_supported) { /* Mask bus clash interrupt */ ctrl->intr_mask &= ~SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET; -- 2.21.0