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>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index b1e209f479ad..cbb23215ad87 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -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