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spi: s3c64xx: Use dmaengine_prep_slave_single() to prepare DMA transfers 

Since the driver supports only contiguous buffers, there is no need to
manually construct a scatterlist with just a single entry, when there is
a dedicated helper for this purpose.

This patch modifies prepare_dma() function to use available helper instead
of manually creating a scatterlist.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Tomasz Figa 2013-08-11 02:33:30 +02:00 committed by Mark Brown
parent 0149871c42
commit 90438c4bf9
1 changed files with 2 additions and 9 deletions
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11
drivers/spi/spi-s3c64xx.c
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@ -389,7 +389,6 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
{
struct s3c64xx_spi_driver_data *sdd;
struct dma_slave_config config;
struct scatterlist sg;
struct dma_async_tx_descriptor *desc;
memset(&config, 0, sizeof(config));
@ -412,14 +411,8 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
dmaengine_slave_config(dma->ch, &config);
}
sg_init_table(&sg, 1);
sg_dma_len(&sg) = len;
sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf)),
len, offset_in_page(buf));
sg_dma_address(&sg) = buf;
desc = dmaengine_prep_slave_sg(dma->ch,
&sg, 1, dma->direction, DMA_PREP_INTERRUPT);
desc = dmaengine_prep_slave_single(dma->ch, buf, len,
dma->direction, DMA_PREP_INTERRUPT);
desc->callback = s3c64xx_spi_dmacb;
desc->callback_param = dma;