linux/drivers/mmc
Shawn Lin 4f25580fb8 mmc: core: changes frequency to hs_max_dtr when selecting hs400es
Per JESD84-B51 P49, Host need to change frequency to <=52MHz
after setting HS_TIMING to 0x1, and host may changes frequency
to <= 200MHz after setting HS_TIMING to 0x3. That means the card
expects the clock rate to increase from the current used f_init
(which is less than 400KHz, but still being less than 52MHz) to
52MHz, otherwise we find some eMMC devices significantly report
failure when sending status.

Reported-by: Xiao Yao <xiaoyao@rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2016-10-10 14:01:15 +02:00
..
card mmc: block: add missing header dependencies 2016-10-10 13:35:15 +02:00
core mmc: core: changes frequency to hs_max_dtr when selecting hs400es 2016-10-10 14:01:15 +02:00
host mmc: sdhci-of-arasan: Fix non static symbol warning 2016-10-10 13:26:53 +02:00
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