Commit b33d46c3 authored Mar 05, 2011 by Ulf Hansson Committed by Chris Ball Mar 17, 2011

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>

parent ab1efd27

drivers/mmc/core/core.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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;