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Subject[v3 PATCH 09/12] spi/atmel_spi: correct 16 bits transfer with DMA
Date
From: Richard Genoud <richard.genoud@gmail.com>

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Cc: grant.likely@secretlab.ca
Cc: spi-devel-general@lists.sourceforge.net
---
drivers/spi/spi-atmel.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 5abb276..dd070cd 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -466,12 +466,18 @@ static inline int atmel_spi_xfer_can_be_chained(struct spi_transfer *xfer)
}

static int atmel_spi_dma_slave_config(struct atmel_spi *as,
- struct dma_slave_config *slave_config)
+ struct dma_slave_config *slave_config,
+ u8 bits_per_word)
{
int err = 0;

- slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
- slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ if (bits_per_word > 8) {
+ slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ } else {
+ slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+ }

slave_config->dst_addr = (dma_addr_t)as->phybase + SPI_TDR;
slave_config->src_addr = (dma_addr_t)as->phybase + SPI_RDR;
@@ -533,7 +539,7 @@ static int __devinit atmel_spi_configure_dma(struct atmel_spi *as)
goto error;
}

- err = atmel_spi_dma_slave_config(as, &slave_config);
+ err = atmel_spi_dma_slave_config(as, &slave_config, 8);
if (err)
goto error;

@@ -667,10 +673,9 @@ static int atmel_spi_next_xfer_dma_submit(struct spi_master *master,

*plen = len;

- if (atmel_spi_dma_slave_config(as, &slave_config))
+ if (atmel_spi_dma_slave_config(as, &slave_config, 8))
goto err_exit;

-
/* Send both scatterlists */
rxdesc = rxchan->device->device_prep_slave_sg(rxchan,
&as->dma.sgrx,
--
1.7.9.5


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