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>
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 2330dce..a7a739c 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -389,7 +389,6 @@
{
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 @@
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;