commit d8262f69ae3f25fd2fc9b8c2f474fcba2295b271
author Pratibhasagar V <pratibha@codeaurora.org> Tue Sep 17 14:25:35 2013 +0530
committer Pratibhasagar V <pratibha@codeaurora.org> Mon Sep 23 15:45:14 2013 +0530
tree ad4abeae68b5976e68f43414e1bb485c59ba739f
parent 0abbea9088592e2afa836a91a883499aa50d1861

ARM: dts: msm: Reduce the clocks for SD card slot for MSM8226

The SD cards functionality on QRD devices are failing
with CRC errors when used with higher clock / bus modes.

So reduce the clock speed for SD card slot.

CRs-Fixed:  491789
Change-Id: I24b8bfe44cee4367c22846747f439365d8795d2e
Signed-off-by: Pratibhasagar V <pratibha@codeaurora.org>

drivers/mmc/core/sd.c

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index a4498d2..3648d88 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -26,6 +26,12 @@
 #include "sd.h"
 #include "sd_ops.h"
 
+#define UHS_SDR104_MIN_DTR	(100 * 1000 * 1000)
+#define UHS_DDR50_MIN_DTR	(50 * 1000 * 1000)
+#define UHS_SDR50_MIN_DTR	(50 * 1000 * 1000)
+#define UHS_SDR25_MIN_DTR	(25 * 1000 * 1000)
+#define UHS_SDR12_MIN_DTR	(12.5 * 1000 * 1000)
+
 static const unsigned int tran_exp[] = {
 	10000,		100000,		1000000,	10000000,
 	0,		0,		0,		0
@@ -486,18 +492,22 @@
 	}
 
 	if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
-	    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
+	    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104) &&
+	    (card->host->f_max > UHS_SDR104_MIN_DTR)) {
 			card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
 	} else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
-		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
+		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50) &&
+		    (card->host->f_max > UHS_DDR50_MIN_DTR)) {
 			card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
 	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 		    MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
-		    SD_MODE_UHS_SDR50)) {
+		    SD_MODE_UHS_SDR50) &&
+		    (card->host->f_max > UHS_SDR50_MIN_DTR)) {
 			card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
 	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 		    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
-		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
+		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25) &&
+		 (card->host->f_max > UHS_SDR25_MIN_DTR)) {
 			card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
 	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 		    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |