[U-Boot] [PATCH v0] davinci, mmc: Added a delay reading ext CSD register
Davide Bonfanti
davide.bonfanti at bticino.it
Thu Nov 29 12:06:53 CET 2012
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 at bticino.it>
---
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 ee8f261..d5a38a7 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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