[PATCH 3/3] SDHC/MMC: add f_min to mmc_power_on

[<Chang-Ming.Huang@freescale.com>]

From: Jerry Huang <Chang-Ming.Huang@freescale.com>

1. when f_init is zero, the SDHC can't work correctly, so f_min will replace it.
2. Before running get_cd recall function to detect if the card is present,
   must make sure the power is up.

Signed-off-by: Jerry Huang <Chang-Ming.Huang@freescale.com>
---
 drivers/mmc/core/core.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 1f453ac..5a22b85 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -993,7 +993,10 @@ static void mmc_power_up(struct mmc_host *host)
 	 */
 	mmc_delay(10);
 
-	host->ios.clock = host->f_init;
+	if (host->f_init)
+		host->ios.clock = host->f_init;
+	else
+		host->ios.clock = host->f_min;
 
 	host->ios.power_mode = MMC_POWER_ON;
 	mmc_set_ios(host);
@@ -1571,8 +1574,10 @@ void mmc_rescan(struct work_struct *work)
 	 */
 	mmc_bus_put(host);
 
+	mmc_power_up(host);
 	if (host->ops->get_cd && host->ops->get_cd(host) == 0)
 		goto out;
+	mmc_power_off(host);
 
 	mmc_claim_host(host);
 	for (i = 0; i < ARRAY_SIZE(freqs); i++) {
-- 
1.7.4.1