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Commit bf83fd64 authored by Qipan Li's avatar Qipan Li Committed by Mark Brown
Browse files

spi: sirf: fix spi full-duplex DMA transferring issue 



sometimes t->tx can be equal with t->rx. for example, spidev will make
tx and rx point to spidev->buffer at the same time. currently, for this
case, we map the buffer BIDIRECTION to fix the cache consistency.

Signed-off-by: default avatarQipan Li <Qipan.Li@csr.com>
Signed-off-by: default avatarBarry Song <Baohua.Song@csr.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent d77ec5df

drivers/spi/spi-sirf.c

+5 −2
Original line number Diff line number Diff line
@@ -383,7 +383,8 @@ static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t) 
		struct dma_async_tx_descriptor *rx_desc, *tx_desc;



		sspi->dst_start = dma_map_single(&spi->dev,

				sspi->rx, t->len, DMA_FROM_DEVICE);

				sspi->rx, t->len, (t->tx_buf != t->rx_buf) ?

				DMA_FROM_DEVICE : DMA_BIDIRECTIONAL);

		rx_desc = dmaengine_prep_slave_single(sspi->rx_chan,

			sspi->dst_start, t->len, DMA_DEV_TO_MEM,

			DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
@@ -391,7 +392,9 @@ static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t) 
		rx_desc->callback_param = &sspi->rx_done;



		sspi->src_start = dma_map_single(&spi->dev,

				(void *)sspi->tx, t->len, DMA_TO_DEVICE);

				(void *)sspi->tx, t->len,

				(t->tx_buf != t->rx_buf) ?

				DMA_TO_DEVICE : DMA_BIDIRECTIONAL);

		tx_desc = dmaengine_prep_slave_single(sspi->tx_chan,

			sspi->src_start, t->len, DMA_MEM_TO_DEV,

			DMA_PREP_INTERRUPT | DMA_CTRL_ACK);