From e711f0309109701cb422aab44ace4ea0dccb89ea Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Fri, 2 Dec 2016 15:14:23 +0200 Subject: mmc: mmc: Introduce mmc_abort_tuning() If a tuning command times out, the card could still be processing it, which will cause problems for recovery. The eMMC specification says that CMD12 can be used to stop CMD21, so add a function that does that. Signed-off-by: Adrian Hunter Signed-off-by: Ulf Hansson --- drivers/mmc/core/mmc_ops.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'drivers/mmc') diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index 81ce63bb0773..b11c3455b040 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -678,6 +678,31 @@ out: } EXPORT_SYMBOL_GPL(mmc_send_tuning); +int mmc_abort_tuning(struct mmc_host *host, u32 opcode) +{ + struct mmc_command cmd = {0}; + + /* + * eMMC specification specifies that CMD12 can be used to stop a tuning + * command, but SD specification does not, so do nothing unless it is + * eMMC. + */ + if (opcode != MMC_SEND_TUNING_BLOCK_HS200) + return 0; + + cmd.opcode = MMC_STOP_TRANSMISSION; + cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; + + /* + * For drivers that override R1 to R1b, set an arbitrary timeout based + * on the tuning timeout i.e. 150ms. + */ + cmd.busy_timeout = 150; + + return mmc_wait_for_cmd(host, &cmd, 0); +} +EXPORT_SYMBOL_GPL(mmc_abort_tuning); + static int mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode, u8 len) -- cgit v1.2.3