p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

mmc: core: switch to 1V8 or 1V2 for hs400es mode 

When introducing hs400es, I didn't notice that we haven't
switched voltage to 1V2 or 1V8 for it. That happens to work
as the first controller claiming to support hs400es, arasan(5.1),
which is designed to only support 1V8. So the voltage is fixed to 1V8.
But it actually is wrong, and will not fit for other host controllers.
Let's fix it.

Fixes: commit 81ac2af657 ("mmc: core: implement enhanced strobe support")
Cc: <stable@vger.kernel.org>
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>
This commit is contained in:
Shawn Lin 2016-09-30 14:18:58 +08:00 committed by Ulf Hansson
parent 48ab086d26
commit 1720d3545b
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/mmc/core/mmc.c
View File

@ -1263,6 +1263,16 @@ static int mmc_select_hs400es(struct mmc_card *card)
goto out_err;
}
if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
/* If fails try again during next card power cycle */
if (err)
goto out_err;
err = mmc_select_bus_width(card);
if (err < 0)
goto out_err;