diff mbox

[4/7,v2] mmc: sh_mobile_sdhi: use blk_size_workaround

Message ID 87fvgakcei.wl%kuninori.morimoto.gx@gmail.com (mailing list archive)
State Changes Requested
Headers show

Commit Message

Kuninori Morimoto Sept. 2, 2014, 2:02 a.m. UTC 
From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

Now, sh_mobile_sdhi can use blk_size_workaround instead of
MMC_CAP2_NO_MULTI_READ. let's use it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
---
v1 -> v2

- no change

 drivers/mmc/host/sh_mobile_sdhi.c |   20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c
index f2585b6..474cd8e 100644
--- a/drivers/mmc/host/sh_mobile_sdhi.c
+++ b/drivers/mmc/host/sh_mobile_sdhi.c
@@ -58,7 +58,6 @@  static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = {
 	.tmio_flags	= TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
 			  TMIO_MMC_CLK_ACTUAL,
 	.capabilities	= MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
-	.capabilities2	= MMC_CAP2_NO_MULTI_READ,
 	.dma_rx_offset	= 0x2000,
 };
 
@@ -139,6 +138,24 @@  static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
 	return 0;
 }
 
+static int sh_mobile_blk_size_workaround(struct mmc_card *card,
+					 struct request *req, int blk_size)
+{
+	/*
+	 * In Renesas controllers, when performing a
+	 * multiple block read of one or two blocks,
+	 * depending on the timing with which the
+	 * response register is read, the response
+	 * value may not be read properly.
+	 * Use single block read for this HW bug
+	 */
+	if ((rq_data_dir(req) == READ) &&
+	    blk_size == 2)
+		return 1;
+
+	return blk_size;
+}
+
 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
 {
 	mmc_detect_change(platform_get_drvdata(pdev), msecs_to_jiffies(100));
@@ -194,6 +211,7 @@  static int sh_mobile_sdhi_probe(struct platform_device *pdev)
 	mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
 	mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 	mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
+	mmc_data->blk_size_workaround = sh_mobile_blk_size_workaround;
 	if (p) {
 		mmc_data->flags = p->tmio_flags;
 		mmc_data->ocr_mask = p->tmio_ocr_mask;