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authorMike Frysinger <vapier.adi@gmail.com>2009-04-06 19:00:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 08:31:04 -0700
commit04b95d2f7453d64f89ca1d8c3e70bcc7cc38320f (patch)
tree6a49d81d049445071f077f84be69a1a598864012
parentace32865a3767e4e385b883868c228a2a6db225a (diff)
Blackfin SPI Driver: pass DMA overflow error to the higher level
If the SPI bus registers a receive overflow error, pass the result back up to the higher levels. Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/spi/spi_bfin5xx.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 6d3f6064871..2e0c024bbde 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -559,6 +559,7 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
struct driver_data *drv_data = dev_id;
struct chip_data *chip = drv_data->cur_chip;
struct spi_message *msg = drv_data->cur_msg;
+ u16 spistat = read_STAT(drv_data);
dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler\n");
clear_dma_irqstat(drv_data->dma_channel);
@@ -582,13 +583,18 @@ static irqreturn_t dma_irq_handler(int irq, void *dev_id)
while (!(read_STAT(drv_data) & SPIF))
cpu_relax();
- msg->actual_length += drv_data->len_in_bytes;
+ if (spistat & RBSY) {
+ msg->state = ERROR_STATE;
+ dev_err(&drv_data->pdev->dev, "dma receive: fifo/buffer overflow\n");
+ } else {
+ msg->actual_length += drv_data->len_in_bytes;
- if (drv_data->cs_change)
- cs_deactive(drv_data, chip);
+ if (drv_data->cs_change)
+ cs_deactive(drv_data, chip);
- /* Move to next transfer */
- msg->state = next_transfer(drv_data);
+ /* Move to next transfer */
+ msg->state = next_transfer(drv_data);
+ }
/* Schedule transfer tasklet */
tasklet_schedule(&drv_data->pump_transfers);