> On November 22, 2019 at 7:13 AM Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote:
>
>
> To improve performance, this patch sets dma_buswidth value to 32
> when transfer size is multiples of 32. In other words, a sd card
> transfer's size if not multiples of 32, this driver uses PIO
> and then the performance will be down.
>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> ---
> drivers/mmc/host/renesas_sdhi_sys_dmac.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/renesas_sdhi_sys_dmac.c b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
> index 09137cc..65e71b6 100644
> --- a/drivers/mmc/host/renesas_sdhi_sys_dmac.c
> +++ b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
> @@ -58,7 +58,7 @@ static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = {
> .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
> MMC_CAP_CMD23,
> .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
> - .dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES,
> + .dma_buswidth = DMA_SLAVE_BUSWIDTH_32_BYTES,
> .dma_rx_offset = 0x2000,
> .scc_offset = 0x0300,
> .taps = rcar_gen2_scc_taps,
> --
> 2.7.4
>
Reviewed-by: Ulrich Hecht <uli+renesas@xxxxxxxx>
CU
Uli
