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
