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spi: dw-mid: take care of FIFO overrun/underrun when do DMA 

In according to documentation SPI in DMA mode may encounter underrun/overrun
failures in rare cases. When such failure occurs, an error recovery protocol is
expected to be implemented in the device driver so that the failed transaction
can be restarted.

This patch enables FIFO overrun / underrun interrupts in DMA case and adds a
handler for that.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andy Shevchenko 2015-03-09 16:48:47 +02:00 committed by Mark Brown
parent 9f14538ecd
commit f051fc8f11
1 changed files with 21 additions and 0 deletions
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21
drivers/spi/spi-dw-mid.c
View File

@ -100,6 +100,22 @@ static void mid_spi_dma_exit(struct dw_spi *dws)
dma_release_channel(dws->rxchan);
}
static irqreturn_t dma_transfer(struct dw_spi *dws)
{
u16 irq_status = dw_readw(dws, DW_SPI_ISR);
if (!irq_status)
return IRQ_NONE;
dw_readw(dws, DW_SPI_ICR);
spi_reset_chip(dws);
dev_err(&dws->master->dev, "%s: FIFO overrun/underrun\n", __func__);
dws->master->cur_msg->status = -EIO;
spi_finalize_current_transfer(dws->master);
return IRQ_HANDLED;
}
static enum dma_slave_buswidth convert_dma_width(u32 dma_width) {
if (dma_width == 1)
return DMA_SLAVE_BUSWIDTH_1_BYTE;
@ -220,6 +236,11 @@ static int mid_spi_dma_setup(struct dw_spi *dws)
dma_ctrl |= SPI_DMA_RDMAE;
dw_writew(dws, DW_SPI_DMACR, dma_ctrl);
/* Set the interrupt mask */
spi_umask_intr(dws, SPI_INT_TXOI | SPI_INT_RXUI | SPI_INT_RXOI);
dws->transfer_handler = dma_transfer;
return 0;
}