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mmc: core: Add new power_mode MMC_POWER_UNDEFINED 

Add MMC_POWER_UNDEFINED for power_mode in struct mmc_ios and use it as
the initial value of host->ios.power_mode.

For hosts with MMC_CAP2_NO_PRESCAN_POWERUP, this makes the later
mmc_power_off() do real power-off things instead of NOP, and further
prevents state messed up in cards that was already initialized (eg. by
BIOS of UEFI driver).

Signed-off-by: Roger Tseng <rogerable@realtek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Roger Tseng 2014-09-24 17:07:13 +08:00 committed by Ulf Hansson
parent 7756a96d16
commit 8af465db96
2 changed files with 2 additions and 0 deletions
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1
drivers/mmc/core/core.c
View File

@ -2482,6 +2482,7 @@ void mmc_start_host(struct mmc_host *host)
{
host->f_init = max(freqs[0], host->f_min);
host->rescan_disable = 0;
host->ios.power_mode = MMC_POWER_UNDEFINED;
if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
mmc_power_off(host);
else

1
include/linux/mmc/host.h
View File

@ -42,6 +42,7 @@ struct mmc_ios {
#define MMC_POWER_OFF 0
#define MMC_POWER_UP 1
#define MMC_POWER_ON 2
#define MMC_POWER_UNDEFINED 3
unsigned char bus_width; /* data bus width */