diff options
| author | Shawn Lin <shawn.lin@rock-chips.com> | 2016-09-30 14:18:59 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2016-10-10 14:01:15 +0200 |
| commit | 4f25580fb84d934d7ecffa3c0aa8f10f7e23af92 (patch) | |
| tree | 624c64cb0d179ff5ef5732ce4f7d58eaf4302b59 /mm/backing-dev.c | |
| parent | 1720d3545b772c49b2975eeb3b8f4d3f56dc2085 (diff) | |
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>
Diffstat (limited to 'mm/backing-dev.c')
0 files changed, 0 insertions, 0 deletions