[PATCH RFC 1/4] mmc: host: renesas_sdhi_sys_dmac: Use dma_buswidth instead of hardcoded value

[Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>]

This patch uses dma_buswidth instread of hardcoded value of
TMIO_MMC_MIN_DMA_LEN (8) for increasing the buswidth in the future.
Note that, since the dma_buswidth is 4 and the align is 2,
when the sg_tmp->length is 6, it cannot transfer correcly.
So, this patch changes the conditions.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
 drivers/mmc/host/renesas_sdhi_sys_dmac.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/renesas_sdhi_sys_dmac.c b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
index 13ff023..30f34a3 100644
--- a/drivers/mmc/host/renesas_sdhi_sys_dmac.c
+++ b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
@@ -23,8 +23,6 @@
 #include "renesas_sdhi.h"
 #include "tmio_mmc.h"
 
-#define TMIO_MMC_MIN_DMA_LEN 8
-
 static const struct renesas_sdhi_of_data of_default_cfg = {
 	.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
 };
@@ -159,11 +157,12 @@ static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host)
 	int ret, i;
 	bool aligned = true, multiple = true;
 	unsigned int align = (1 << host->pdata->alignment_shift) - 1;
+	unsigned int min_len = priv->dma_priv.dma_buswidth ? : align + 1;
 
 	for_each_sg(sg, sg_tmp, host->sg_len, i) {
 		if (sg_tmp->offset & align)
 			aligned = false;
-		if (sg_tmp->length & align) {
+		if (sg_tmp->length % min_len) {
 			multiple = false;
 			break;
 		}
@@ -175,7 +174,7 @@ static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host)
 		goto pio;
 	}
 
-	if (sg->length < TMIO_MMC_MIN_DMA_LEN)
+	if (sg->length < min_len)
 		return;
 
 	/* The only sg element can be unaligned, use our bounce buffer then */
@@ -231,11 +230,12 @@ static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host)
 	int ret, i;
 	bool aligned = true, multiple = true;
 	unsigned int align = (1 << host->pdata->alignment_shift) - 1;
+	unsigned int min_len = priv->dma_priv.dma_buswidth ? : align + 1;
 
 	for_each_sg(sg, sg_tmp, host->sg_len, i) {
 		if (sg_tmp->offset & align)
 			aligned = false;
-		if (sg_tmp->length & align) {
+		if (sg_tmp->length % min_len) {
 			multiple = false;
 			break;
 		}
@@ -247,7 +247,7 @@ static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host)
 		goto pio;
 	}
 
-	if (sg->length < TMIO_MMC_MIN_DMA_LEN)
+	if (sg->length < min_len)
 		return;
 
 	/* The only sg element can be unaligned, use our bounce buffer then */
-- 
2.7.4