On Tue, Nov 08, 2016 at 02:28:40AM +0800, Hao Zhang wrote:
> According to the datasheet, the dma of A64 support 8/16/32/64 bits
> so, we can add the condition of device compatible in convert_buswidth
> function and other place to determine the device whether is for A64,
> and then accept the 8 bytes bus width to it.
>
> Signed-off-by: Hao Zhang <hao5781286@xxxxxxxxx>
> ---
> drivers/dma/sun6i-dma.c | 43 +++++++++++++++++++++++++++++++++----------
> 1 file changed, 33 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
> index 8346199..8a95a1a 100644
> --- a/drivers/dma/sun6i-dma.c
> +++ b/drivers/dma/sun6i-dma.c
> @@ -247,13 +247,17 @@ static inline s8 convert_burst(u32 maxburst)
> }
> }
>
> -static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width)
> +static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width,
> + struct sun6i_dma_dev *sdev)
> {
> - if ((addr_width < DMA_SLAVE_BUSWIDTH_1_BYTE) ||
> - (addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES))
> + if (((addr_width >= DMA_SLAVE_BUSWIDTH_1_BYTE) &&
> + (addr_width <= DMA_SLAVE_BUSWIDTH_4_BYTES)) ||
> + ((addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) &&
> + (of_device_is_compatible(sdev->slave.dev->of_node,
> + "allwinner,sun50i-a64-dma"))))
> + return addr_width >> 1;
> + else
Just like for the burst (https://lkml.org/lkml/2016/10/4/367) I think
this should be taken care of in the the framework's
dmaengine_slave_config function.
This is quite easy to do in the width case, since you just have to
test whether what has been set in the dma_device has support for the
burst give in the configuration.
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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