Commit 04b95d2f authored by Mike Frysinger's avatar Mike Frysinger Committed by Linus Torvalds
Browse files

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: default avatarMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
Acked-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ace32865
......@@ -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);
......
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