From b34fb6e9f1d68e180419f38de4719a50ed5cd706 Mon Sep 17 00:00:00 2001 From: Ryan QIAN Date: Wed, 16 Jan 2013 10:23:28 +0800 Subject: [PATCH] ENGR00287331-1 mmc: add delay after CMD6 befoer sending CMD13 for sandisk - Some sandisk emmc cards need certain delay befor sending cmd13 after cmd6. Original CR: ENGR174296 (commit: fd031f9) Acked-by: Aisheng Dong Signed-off-by: Ryan QIAN (cherry picked from commit f942bf1db36355d46f38792601594949f3f2c71b) --- drivers/mmc/core/mmc_ops.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index 49f04bc9d0eb..83d17a9daea0 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -440,6 +440,12 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value, if (!use_busy_signal) return 0; + /* + * WORKAROUND: for Sandisk eMMC cards, it might need certain delay + * before sending CMD13 after CMD6 + */ + mdelay(1); + /* Must check status to be sure of no errors */ timeout = jiffies + msecs_to_jiffies(MMC_OPS_TIMEOUT_MS); do { -- 2.39.5