From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
To avoid complicate code in own dma code for gen3, this patch
adds set max_segs to 1. Then, the tmio driver will get requests
as sg_len = 1 only.
In the performance point of view, the CONFIG_MMC_BLOCK_BOUNCE should
be set. Otherwise, mmc block layer will set 4-kbyte each as a request.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: Ai Kyuse <ai.kyuse.uw@xxxxxxxxxxx>
Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
---
v2
* First post
---
drivers/mmc/host/sh_mobile_sdhi.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c
index 394e018e6f39..83ca6cb78484 100644
--- a/drivers/mmc/host/sh_mobile_sdhi.c
+++ b/drivers/mmc/host/sh_mobile_sdhi.c
@@ -54,6 +54,8 @@ struct sh_mobile_sdhi_of_data {
enum dma_slave_buswidth dma_buswidth;
dma_addr_t dma_rx_offset;
unsigned bus_shift;
+ unsigned int max_blk_count;
+ unsigned short max_segs;
};
static const struct sh_mobile_sdhi_of_data of_default_cfg = {
@@ -79,6 +81,9 @@ static const struct sh_mobile_sdhi_of_data of_rcar_gen3_compatible = {
TMIO_MMC_CLK_ACTUAL | TMIO_MMC_MIN_RCAR2,
.capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
.bus_shift = 2,
+ /* Gen3 SDHI DMAC can handle 0xffffffff blk count, but seg = 1 */
+ .max_blk_count = 0xffffffff,
+ .max_segs = 1,
};
static const struct of_device_id sh_mobile_sdhi_of_match[] = {
@@ -365,6 +370,8 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
mmc_data->capabilities |= of_data->capabilities;
mmc_data->capabilities2 |= of_data->capabilities2;
mmc_data->dma_rx_offset = of_data->dma_rx_offset;
+ mmc_data->max_blk_count = of_data->max_blk_count;
+ mmc_data->max_segs = of_data->max_segs;
dma_priv->dma_buswidth = of_data->dma_buswidth;
host->bus_shift = of_data->bus_shift;
}
--
2.7.0.rc3.207.g0ac5344
