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Subject[PATCH v6 04/14] spi: qup: Place the QUP in run mode before DMA
Date
Signed-off-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Varadarajan Narayanan <varada@codeaurora.org>
---
drivers/spi/spi-qup.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index fdd34c3..f1aa5c1 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -343,6 +343,14 @@ static int spi_qup_do_dma(struct spi_master *master, struct spi_transfer *xfer,
else if (xfer->tx_buf)
tx_done = spi_qup_dma_done;

+ /* before issuing the descriptors, set the QUP to run */
+ ret = spi_qup_set_state(qup, QUP_STATE_RUN);
+ if (ret) {
+ dev_warn(qup->dev, "%s(%d): cannot set RUN state\n",
+ __func__, __LINE__);
+ return ret;
+ }
+
if (xfer->rx_buf) {
ret = spi_qup_prep_sg(master, xfer, DMA_DEV_TO_MEM, rx_done);
if (ret)
@@ -385,6 +393,13 @@ static int spi_qup_do_pio(struct spi_master *master, struct spi_transfer *xfer,

spi_qup_fifo_write(qup, xfer);

+ ret = spi_qup_set_state(qup, QUP_STATE_RUN);
+ if (ret) {
+ dev_warn(qup->dev, "%s(%d): cannot set RUN state\n",
+ __func__, __LINE__);
+ return ret;
+ }
+
if (!wait_for_completion_timeout(&qup->done, timeout))
return -ETIMEDOUT;

--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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