From 3ba36d603a6fc2806fc55fd814d8c5cc4ca93547 Mon Sep 17 00:00:00 2001 From: Davide Bonfanti Date: Thu, 29 Nov 2012 01:06:53 +0000 Subject: 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 Acked-by: Tom Rini Signed-off-by: Andy Fleming --- 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 e2379e326e..5aa218426f 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); -- cgit v1.2.1