Arnd Bergmann wrote:
>
> There is a subtle difference between dma_transfer_direction and
> dma_data_direction: the former is used by the dmaengine framework,
> while the latter is used by the dma-mapping API. Although the
> purpose is comparable, the actual values are different and must
> not be mixed. In this case, the driver just wants to use
> dma_transfer_direction.
>
> Without this patch, building s3c6400_defconfig results in:
>
> drivers/spi/spi-s3c64xx.c: In function 's3c64xx_spi_dmacb':
> drivers/spi/spi-s3c64xx.c:239:21: warning: comparison between
> 'enum dma_data_direction' and 'enum dma_transfer_direction' [-
> Wenum-compare]
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> Cc: Ben Dooks <ben-linux@xxxxxxxxx>
> Cc: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
Acked-by: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
BTW, don't we need following accordingly?
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 1a81c90..a0bb55e 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -1067,11 +1067,11 @@ static int __devinit s3c64xx_spi_get_dmares(
if (tx) {
dma_data = &sdd->tx_dma;
- dma_data->direction = DMA_TO_DEVICE;
+ dma_data->direction = DMA_MEM_TO_DEV;
chan_str = "tx";
} else {
dma_data = &sdd->rx_dma;
- dma_data->direction = DMA_FROM_DEVICE;
+ dma_data->direction = DMA_DEV_TO_MEM;
chan_str = "rx";
}
Thanks.
Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@xxxxxxxxxxx>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.
> Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-samsung-soc@xxxxxxxxxxxxxxx
> Cc: spi-devel-general@xxxxxxxxxxxxxxxxxxxxx
> ---
> drivers/spi/spi-s3c64xx.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
> index d1c8441f..2e44dd6 100644
> --- a/drivers/spi/spi-s3c64xx.c
> +++ b/drivers/spi/spi-s3c64xx.c
> @@ -132,7 +132,7 @@
>
> struct s3c64xx_spi_dma_data {
> unsigned ch;
> - enum dma_data_direction direction;
> + enum dma_transfer_direction direction;
> enum dma_ch dmach;
> struct property *dma_prop;
> };
> --
> 1.7.10
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