From fe95905ffed57d617cad81a71ac419d53aaa1ebf Mon Sep 17 00:00:00 2001 From: Haibo Chen Date: Mon, 15 Jun 2020 17:18:12 +0800 Subject: [PATCH] mmc: retry CMD1 in mmc_send_op_cond() until the eMMC is ready According to eMMC specification v5.1 section 6.4.3, we should issue CMD1 repeatedly in the idle state until the eMMC is ready even if mmc_send_op_cond() send CMD1 with argument = 0. Otherwise some eMMC devices seems to enter the inactive mode after mmc_complete_op_cond() issued CMD0 when the eMMC device is busy. Signed-off-by: Haibo Chen Reviewed-by: Peng Fan --- drivers/mmc/mmc.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index 620bb93064..725a36799d 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -669,12 +669,15 @@ static int mmc_send_op_cond_iter(struct mmc *mmc, int use_arg) static int mmc_send_op_cond(struct mmc *mmc) { int err, i; + int timeout = 1000; + uint start; /* Some cards seem to need this */ mmc_go_idle(mmc); + start = get_timer(0); /* Asking to the card its capabilities */ - for (i = 0; i < 2; i++) { + for (i = 0; ; i++) { err = mmc_send_op_cond_iter(mmc, i != 0); if (err) return err; @@ -682,6 +685,10 @@ static int mmc_send_op_cond(struct mmc *mmc) /* exit if not busy (flag seems to be inverted) */ if (mmc->ocr & OCR_BUSY) break; + + if (get_timer(start) > timeout) + return -ETIMEDOUT; + udelay(100); } mmc->op_cond_pending = 1; return 0; -- 2.25.1