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 9440787e924b..adf025194a31 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -404,6 +404,32 @@ static int swrm_wait_for_wr_fifo_avail(struct qcom_swrm_ctrl *ctrl)
return 0;
}
+static bool swrm_wait_for_wr_fifo_done(struct qcom_swrm_ctrl *ctrl)
+{
+ u32 fifo_outstanding_cmds, value;
+ int fifo_retry_count = SWR_OVERFLOW_RETRY_COUNT;
+
+ /* Check for fifo overflow during write */
+ ctrl->reg_read(ctrl, ctrl->reg_layout[SWRM_REG_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);
+ ctrl->reg_read(ctrl, ctrl->reg_layout[SWRM_REG_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 *ctrl, u8 cmd_data,
u8 dev_addr, u16 reg_addr)
{
@@ -434,6 +460,7 @@ static int qcom_swrm_cmd_fifo_wr_cmd(struct qcom_swrm_ctrl *ctrl, u8 cmd_data,
usleep_range(150, 155);
if (cmd_id == SWR_BROADCAST_CMD_ID) {
+ swrm_wait_for_wr_fifo_done(ctrl);
/*
* sleep for 10ms for MSM soundwire variant to allow broadcast
* command to complete.
@@ -1230,6 +1257,7 @@ 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);
@@ -1688,6 +1716,7 @@ 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
