From: Łukasz Majewski <l.majewski@samsung.com>
Date: Mon, 12 Mar 2012 22:07:18 +0000 (+0000)
Subject: mmc:fix: Set mmc width according to MMC host capabilities
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=62722036410b7887a04cf6705effb3122fb9b549;p=u-boot.git

mmc:fix: Set mmc width according to MMC host capabilities

This patch sets the MMC width according to the MMC host capabilities.
It turned out, that there are some targets (e.g. GONI), which are able
to read data from SPI only at 4 bit mode.
This patch restricts the width number according to the MMC host.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Andy Fleming <afleming@gmail.com>
---

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 596732e80e..aebe578ff6 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1199,7 +1199,9 @@ int mmc_startup(struct mmc *mmc)
 		else
 			mmc_set_clock(mmc, 25000000);
 	} else {
-		for (width = EXT_CSD_BUS_WIDTH_8; width >= 0; width--) {
+		width = ((mmc->host_caps & MMC_MODE_MASK_WIDTH_BITS) >>
+			 MMC_MODE_WIDTH_BITS_SHIFT);
+		for (; width >= 0; width--) {
 			/* Set the card to use 4 bit*/
 			err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
 					EXT_CSD_BUS_WIDTH, width);
diff --git a/include/mmc.h b/include/mmc.h
index f52df70ad4..ee16349f83 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -47,6 +47,9 @@
 #define MMC_MODE_SPI		0x400
 #define MMC_MODE_HC		0x800
 
+#define MMC_MODE_MASK_WIDTH_BITS (MMC_MODE_4BIT | MMC_MODE_8BIT)
+#define MMC_MODE_WIDTH_BITS_SHIFT 8
+
 #define SD_DATA_4BIT	0x00040000
 
 #define IS_SD(x) (x->version & SD_VERSION_SD)