From: Srinivas Kandagatla Date: Wed, 26 Oct 2022 11:02:06 +0000 (+0100) Subject: soundwire: qcom: check for outanding writes before doing a read X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=49a467310dc4fae591a3547860ee04d8730780f4;p=linux.git soundwire: qcom: check for outanding writes before doing a read Reading will increase the fifo count, so check for outstanding cmd wrt. write fifo depth to avoid overflow as read will also increase write fifo cnt. Fixes: a661308c34de ("soundwire: qcom: wait for fifo space to be available before read/write") Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20221026110210.6575-3-srinivas.kandagatla@linaro.org Signed-off-by: Vinod Koul --- diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c index 8f1a1eb017a2..cee2b2223141 100644 --- a/drivers/soundwire/qcom.c +++ b/drivers/soundwire/qcom.c @@ -380,6 +380,12 @@ static int qcom_swrm_cmd_fifo_rd_cmd(struct qcom_swrm_ctrl *swrm, val = swrm_get_packed_reg_val(&swrm->rcmd_id, len, dev_addr, reg_addr); + /* + * Check for outstanding cmd wrt. write fifo depth to avoid + * overflow as read will also increase write fifo cnt. + */ + swrm_wait_for_wr_fifo_avail(swrm); + /* wait for FIFO RD to complete to avoid overflow */ usleep_range(100, 105); swrm->reg_write(swrm, SWRM_CMD_FIFO_RD_CMD, val);