commit f7289ee5161925731292185cd43698f88b4138cf
author Davide Bonfanti <davide.bonfanti@bticino.it> Thu Nov 29 01:06:53 2012 +0000
committer Andy Fleming <afleming@freescale.com> Mon May 06 16:26:24 2013 -0500
tree be2ab3ab5d02bc2924cbf2d6af42c2e407150a0f
parent 4a2c7d7f81b448b13ba52e6ec6595a25dbf56fff

davinci, mmc: Added a delay reading ext CSD register

Without this additional delay, some eMMC don't negotiate properly bus width
Tested on:
 - Toshiba THGBM2G8D8FBAIB
 - Toshiba THGBM4G4D1HBAR
 - Micron MTFC4GMVEA (the one giving the problem)
 - Hynix H26M64002BNR
 - SanDisk SDIN5E1-32G

Signed-off-by: Davide Bonfanti <davide.bonfanti@bticino.it>
Acked-by: Tom Rini <trini@ti.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

drivers/mmc/davinci_mmc.c

diff --git a/drivers/mmc/davinci_mmc.c b/drivers/mmc/davinci_mmc.c
index e2379e3..5aa2184 100644
--- a/drivers/mmc/davinci_mmc.c
+++ b/drivers/mmc/davinci_mmc.c
@@ -285,8 +285,11 @@
 			 */
 			if (bytes_left > fifo_bytes)
 				dmmc_wait_fifo_status(regs, 0x4a);
-			else if (bytes_left == fifo_bytes)
+			else if (bytes_left == fifo_bytes) {
 				dmmc_wait_fifo_status(regs, 0x40);
+				if (cmd->cmdidx == MMC_CMD_SEND_EXT_CSD)
+					udelay(600);
+			}
 
 			for (i = 0; bytes_left && (i < fifo_words); i++) {
 				cmddata = get_val(&regs->mmcdrr);