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authorUlf Hansson <ulf.hansson@stericsson.com>2011-03-05 14:36:24 +0100
committerChris Ball <cjb@laptop.org>2011-03-17 20:35:13 +0100
commitb33d46c398fd071dccd0815f33620924684860cd (patch)
tree1b83b93235a825fee112865d0627b069d4d5348a /drivers/mmc
parentmmc: core: export function mmc_do_release_host() (diff)
downloadlinux-b33d46c398fd071dccd0815f33620924684860cd.tar.xz
linux-b33d46c398fd071dccd0815f33620924684860cd.zip
mmc: core: reset card voltage after power off
At power off, reset OCR mask to be the highest possible voltage supported for the current mmc host. This solves the re-initialization during the power up sequence. The voltage may have been decreased due to the card accepts a lower voltage than the voltage used during the initialization sequence. We need to reset the voltage to by the host highest possible value since according to specification the initialization must always be done at high voltage. Reviewed-by: Jonas Aberg <jonas.aberg@stericsson.com> Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/core.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 4956da133be4..1f453acc8682 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1009,6 +1009,13 @@ static void mmc_power_off(struct mmc_host *host)
{
host->ios.clock = 0;
host->ios.vdd = 0;
+
+ /*
+ * Reset ocr mask to be the highest possible voltage supported for
+ * this mmc host. This value will be used at next power up.
+ */
+ host->ocr = 1 << (fls(host->ocr_avail) - 1);
+
if (!mmc_host_is_spi(host)) {
host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
host->ios.chip_select = MMC_CS_DONTCARE;