diff options
| author | Ulf Hansson <ulf.hansson@stericsson.com> | 2012-03-01 13:18:05 +0100 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2012-03-04 12:25:15 -0500 |
| commit | e7747475b61fdc2a4a412475a9d64d8c309916e3 (patch) | |
| tree | 88b5e94955c856db008d992f3bae21e053cd1d21 /drivers/mmc/core/mmc.c | |
| parent | 8f7f6b7e46117edb83d12a508fffa0f013457677 (diff) | |
mmc: core: Fixup suspend/resume issues for UHS-I cards
Even if cards supports 1.8V I/O voltage those should anyway be
initialized at 3.3V I/O according to (e)MMC, SD and SDIO specs.
Some eMMC and embedded SDIO devices are able to be initialized
at 1.8V as well, but it is better to be safe.
Do note that initialization in this context means that the card
has been completely powered off, otherwise the card will remain
at the last I/O voltage level that were negotitiated.
Due to the above being taken care of the suspend/resume issues
for UHS-I SD-cards has been fixed.
Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com>
Acked-by: Philip Rakity <prakity@marvell.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/core/mmc.c')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index a48066344fa..2b9ed1401dc 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -816,6 +816,9 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, if (!mmc_host_is_spi(host)) mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN); + /* Initialization should be done at 3.3 V I/O voltage. */ + mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0); + /* * Since we're changing the OCR value, we seem to * need to tell some cards to go back to the idle |