From 04b95d2f7453d64f89ca1d8c3e70bcc7cc38320f Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Mon, 6 Apr 2009 19:00:35 -0700 Subject: [PATCH] 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 Signed-off-by: Bryan Wu Acked-by: David Brownell Cc: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/spi/spi_bfin5xx.c | 16 +++++++++++----- 1 file 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); -- 2.20.1