[PATCH v3 04/15] spi: qup: Add completion timeout

Varadarajan Narayanan
2017-06-20T09:10:46Z

Add i/o completion timeout for DMA and PIO modes.

Signed-off-by: Andy Gross <andy.gross-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Signed-off-by: Varadarajan Narayanan <varada-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
drivers/spi/spi-qup.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 59e799f..d3ccf53 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -330,7 +330,8 @@ static void spi_qup_dma_terminate(struct spi_master *master,
dmaengine_terminate_all(master->dma_rx);
}

-static int spi_qup_do_dma(struct spi_master *master, struct spi_transfer *xfer)
+static int spi_qup_do_dma(struct spi_master *master, struct spi_transfer *xfer,
+ unsigned long timeout)
{
struct spi_qup *qup = spi_master_get_devdata(master);
int ret;
@@ -353,10 +354,17 @@ static int spi_qup_do_dma(struct spi_master *master, struct spi_transfer *xfer)
dma_async_issue_pending(master->dma_tx);
}

+ if (xfer->rx_buf && !wait_for_completion_timeout(&qup->rxc, timeout))
+ return -ETIMEDOUT;
+
+ if (xfer->tx_buf && !wait_for_completion_timeout(&qup->txc, timeout))
+ return -ETIMEDOUT;
+
return 0;
}

-static int spi_qup_do_pio(struct spi_master *master, struct spi_transfer *xfer)
+static int spi_qup_do_pio(struct spi_master *master, struct spi_transfer *xfer,
+ unsigned long timeout)
{
struct spi_qup *qup = spi_master_get_devdata(master);
int ret;
@@ -375,6 +383,9 @@ static int spi_qup_do_pio(struct spi_master *master, struct spi_transfer *xfer)

spi_qup_fifo_write(qup, xfer);

+ if (!wait_for_completion_timeout(&qup->done, timeout))
+ return -ETIMEDOUT;
+
return 0;
}

@@ -618,7 +629,6 @@ static int spi_qup_transfer_one(struct spi_master *master,
timeout = DIV_ROUND_UP(xfer->len * 8, timeout);
timeout = 100 * msecs_to_jiffies(timeout);

-
spin_lock_irqsave(&controller->lock, flags);
controller->xfer = xfer;
controller->error = 0;
@@ -629,10 +639,10 @@ static int spi_qup_transfer_one(struct spi_master *master,
if (spi_qup_is_dma_xfer(controller->mode)) {
reinit_completion(&controller->rxc);
reinit_completion(&controller->txc);
- ret = spi_qup_do_dma(master, xfer);
+ ret = spi_qup_do_dma(master, xfer, timeout);
} else {
reinit_completion(&controller->done);
- ret = spi_qup_do_pio(master, xfer);
+ ret = spi_qup_do_pio(master, xfer, timeout);
}

if (ret)
--
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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