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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>
This commit is contained in:
Davide Bonfanti 2012-11-29 01:06:53 +00:00 committed by Andy Fleming
parent e95504497e
commit 3ba36d603a
1 changed files with 4 additions and 1 deletions
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5
drivers/mmc/davinci_mmc.c
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@ -285,8 +285,11 @@ dmmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
*/ */
if (bytes_left > fifo_bytes) if (bytes_left > fifo_bytes)
dmmc_wait_fifo_status(regs, 0x4a); dmmc_wait_fifo_status(regs, 0x4a);
else if (bytes_left == fifo_bytes) else if (bytes_left == fifo_bytes) {
dmmc_wait_fifo_status(regs, 0x40); 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++) { for (i = 0; bytes_left && (i < fifo_words); i++) {
cmddata = get_val(&regs->mmcdrr); cmddata = get_val(&regs->mmcdrr);