[PATCH 3/3] mmc: core: fix mmc_sdio_reinit_card fail issue

[Yong Mao]

From: yong mao <yong.mao@xxxxxxxxxxxx>

If SDIO device is initialized by UHS mode, it will run with 1.8v power.
In this mode, mmc_go_idle may not make SDIO device go idle successfully
in some special SDIO device. And then it can't be re-initialized
successfully.
According to the logic in sdio_reset_comm and mmc_sdio_sw_reset,
invoking mmc_set_clock(host, host->f_min) before mmc_send_io_op_cond
can make this SDIO device back to right state.

Signed-off-by: Yong Mao <yong.mao@xxxxxxxxxxxx>
---
 drivers/mmc/core/sdio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index f173cad..dc4dc63 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -850,6 +850,7 @@ static int mmc_sdio_reinit_card(struct mmc_host *host)
 
 	sdio_reset(host);
 	mmc_go_idle(host);
+	mmc_set_clock(host, host->f_min);
 	mmc_send_if_cond(host, host->card->ocr);
 
 	ret = mmc_send_io_op_cond(host, 0, NULL);
-- 
1.9.1