From 33ace362fdf80e2e2ea4cdf2829a5179c52de3f4 Mon Sep 17 00:00:00 2001 From: Tom Rini Date: Fri, 7 Feb 2014 14:15:20 -0500 Subject: mmc: Add 'mmc rst-function' sub-command Some eMMC chips may need the RST_n_FUNCTION bit set to a non-zero value in order for warm reset of the system to work. Details on this being required will be part of the eMMC datasheet. Also add using this command to the dra7xx README. * Whitespace fix by panto Signed-off-by: Tom Rini Acked-by: Pantelis Antoniou --- drivers/mmc/mmc.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers') diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index eccdbc4b61..16051e52ff 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -1513,4 +1513,16 @@ int mmc_set_part_conf(struct mmc *mmc, u8 ack, u8 part_num, u8 access) return err; return 0; } + +/* + * Modify EXT_CSD[162] which is RST_n_FUNCTION based on the given value + * for enable. Note that this is a write-once field for non-zero values. + * + * Returns 0 on success. + */ +int mmc_set_rst_n_function(struct mmc *mmc, u8 enable) +{ + return mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_RST_N_FUNCTION, + enable); +} #endif -- cgit