linux-kernel - [PATCH 3/3] mmc: core: fix mmc_sdio_reinit

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Message-ID: <1586835611-13857-4-git-send-email-yong.mao@mediatek.com>
Date:   Tue, 14 Apr 2020 11:40:11 +0800
From:   Yong Mao <yong.mao@...iatek.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     Chaotian Jing <chaotian.jing@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-mmc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <srv_heupstream@...iatek.com>,
        yong mao <yong.mao@...iatek.com>
Subject: [PATCH 3/3] mmc: core: fix mmc_sdio_reinit_card fail issue

From: yong mao <yong.mao@...iatek.com>

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@...iatek.com>
---
 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