[v4,04/14] spi: qup: Add completion timeout

Commit Message

Varadarajan Narayanan June 27, 2017, 9:45 a.m. UTC

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

Signed-off-by: Andy Gross <[e-mail]>
Signed-off-by: Varadarajan Narayanan <[e-mail]>
---
 drivers/spi/spi-qup.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

Patch

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)