From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
To: linux-renesas-soc@vger.kernel.org
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Subject: [PATCH RFC 4/4] mmc: host: renesas_sdhi_sys_dmac: Set dma_buswidth value to 32 byte
Date: Fri, 22 Nov 2019 15:13:51 +0900 [thread overview]
Message-ID: <1574403231-18512-5-git-send-email-yoshihiro.shimoda.uh@renesas.com> (raw)
In-Reply-To: <1574403231-18512-1-git-send-email-yoshihiro.shimoda.uh@renesas.com>
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@renesas.com>
---
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
next prev parent reply other threads:[~2019-11-22 6:16 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-22 6:13 [PATCH RFC 0/4] mmc: host: renesas_sdhi_sys_dmac: change dma_buswidth Yoshihiro Shimoda
2019-11-22 6:13 ` [PATCH RFC 1/4] mmc: host: renesas_sdhi_sys_dmac: Use dma_buswidth instead of hardcoded value Yoshihiro Shimoda
2019-11-26 10:45 ` Ulrich Hecht
2019-11-22 6:13 ` [PATCH RFC 2/4] mmc: host: renesas_sdhi_sys_dmac: Do not fall back to PIO Yoshihiro Shimoda
2019-11-26 10:45 ` Ulrich Hecht
2019-11-22 6:13 ` [PATCH RFC 3/4] mmc: host: renesas_sdhi_sys_dmac: add DMACR setting Yoshihiro Shimoda
2019-11-26 10:46 ` Ulrich Hecht
2019-12-02 8:19 ` Yoshihiro Shimoda
2019-11-22 6:13 ` Yoshihiro Shimoda [this message]
2019-11-26 10:46 ` [PATCH RFC 4/4] mmc: host: renesas_sdhi_sys_dmac: Set dma_buswidth value to 32 byte Ulrich Hecht
2019-11-28 21:07 ` Wolfram Sang
2019-12-02 8:38 ` Yoshihiro Shimoda
2019-12-02 8:54 ` Wolfram Sang
2019-11-26 10:45 ` [PATCH RFC 0/4] mmc: host: renesas_sdhi_sys_dmac: change dma_buswidth Ulrich Hecht
2019-12-02 8:09 ` Yoshihiro Shimoda
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