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| author | Magnus Templing <magnus.templing@stericsson.com> | 2011-05-19 18:05:34 +0200 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2011-05-20 00:43:07 -0600 |
| commit | a18c266f8e43004c85c56b4077f6158fcadb7707 (patch) | |
| tree | 9a1114717a81abc23a17449fd682ae24020dd1ba /drivers/spi | |
| parent | 78fab4c04c76b8c9327541bd270f82b85b42bbf7 (diff) | |
| download | kernel_samsung_smdk4412-a18c266f8e43004c85c56b4077f6158fcadb7707.zip kernel_samsung_smdk4412-a18c266f8e43004c85c56b4077f6158fcadb7707.tar.gz kernel_samsung_smdk4412-a18c266f8e43004c85c56b4077f6158fcadb7707.tar.bz2 | |
spi/pl022: timeout on polled transfer v2
This adds the missing handling of polling timeouts and deletes
our last todo.
Signed-off-by: Magnus Templing <magnus.templing@stericsson.com>
Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
[Fixups from review by Wolfram Sang]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/amba-pl022.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/drivers/spi/amba-pl022.c b/drivers/spi/amba-pl022.c index 08de58e..18667de 100644 --- a/drivers/spi/amba-pl022.c +++ b/drivers/spi/amba-pl022.c @@ -24,11 +24,6 @@ * GNU General Public License for more details. */ -/* - * TODO: - * - add timeout on polled transfers - */ - #include <linux/init.h> #include <linux/module.h> #include <linux/device.h> @@ -287,6 +282,8 @@ #define CLEAR_ALL_INTERRUPTS 0x3 +#define SPI_POLLING_TIMEOUT 1000 + /* * The type of reading going on on this chip @@ -1378,6 +1375,7 @@ static void do_polling_transfer(struct pl022 *pl022) struct spi_transfer *transfer = NULL; struct spi_transfer *previous = NULL; struct chip_data *chip; + unsigned long time, timeout; chip = pl022->cur_chip; message = pl022->cur_msg; @@ -1415,9 +1413,18 @@ static void do_polling_transfer(struct pl022 *pl022) SSP_CR1(pl022->virtbase)); dev_dbg(&pl022->adev->dev, "polling transfer ongoing ...\n"); - /* FIXME: insert a timeout so we don't hang here indefinitely */ - while (pl022->tx < pl022->tx_end || pl022->rx < pl022->rx_end) + + timeout = jiffies + msecs_to_jiffies(SPI_POLLING_TIMEOUT); + while (pl022->tx < pl022->tx_end || pl022->rx < pl022->rx_end) { + time = jiffies; readwriter(pl022); + if (time_after(time, timeout)) { + dev_warn(&pl022->adev->dev, + "%s: timeout!\n", __func__); + message->state = STATE_ERROR; + goto out; + } + } /* Update total byte transferred */ message->actual_length += pl022->cur_transfer->len; @@ -1426,7 +1433,7 @@ static void do_polling_transfer(struct pl022 *pl022) /* Move to next transfer */ message->state = next_transfer(pl022); } - +out: /* Handle end of message */ if (message->state == STATE_DONE) message->status = 0; |