The clock has to be changed after sending CMD6 for HS mode selection in mmc_hs400_to_hs200() function. The JEDEC 5.0 and 5.1 said that "High-speed" mode selection has to enable the the high speed mode timing in the Device, before chaning the clock frequency to a frequency between 26MHz and 52MHz. Signed-off-by: Kyungmin Seo <kyungmin.seo@xxxxxxxxx> --- drivers/mmc/core/mmc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 3486bc7fbb64..98640b51c73e 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1196,10 +1196,6 @@ int mmc_hs400_to_hs200(struct mmc_card *card) int err; u8 val; - /* Reduce frequency to HS */ - max_dtr = card->ext_csd.hs_max_dtr; - mmc_set_clock(host, max_dtr); - /* Switch HS400 to HS DDR */ val = EXT_CSD_TIMING_HS; err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, @@ -1210,6 +1206,10 @@ int mmc_hs400_to_hs200(struct mmc_card *card) mmc_set_timing(host, MMC_TIMING_MMC_DDR52); + /* Reduce frequency to HS */ + max_dtr = card->ext_csd.hs_max_dtr; + mmc_set_clock(host, max_dtr); + err = mmc_switch_status(card); if (err) goto out_err; -- 2.17.1
