From 3ba36d603a6fc2806fc55fd814d8c5cc4ca93547 Mon Sep 17 00:00:00 2001
From: Davide Bonfanti <davide.bonfanti@bticino.it>
Date: Thu, 29 Nov 2012 01:06:53 +0000
Subject: [PATCH] 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 | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/davinci_mmc.c b/drivers/mmc/davinci_mmc.c
index e2379e326ee..5aa218426f4 100644
--- a/drivers/mmc/davinci_mmc.c
+++ b/drivers/mmc/davinci_mmc.c
@@ -285,8 +285,11 @@ dmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
*/
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(®s->mmcdrr);
--
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