linux-kernel - [PATCH 1/3] mmc: core: need do mmc_power_cycle in mmc_sdio_resend_if

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Date:   Tue, 14 Apr 2020 11:40:09 +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 1/3] mmc: core: need do mmc_power_cycle in mmc_sdio_resend_if_cond

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

When mmc_sdio_resned_if_cond is invoked, it indicates the SDIO
device is not in the right state. In this condition, the previous
implementation of mmc_sdio_resend_if_cond can't make sure SDIO
device be back to idle state. mmc_power_cycle can reset the SDIO
device by HW and also make sure SDIO device enter to idle state
correctly.

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 ebb387a..ada0a80 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -546,6 +546,7 @@ static int mmc_sdio_init_uhs_card(struct mmc_card *card)
 static void mmc_sdio_resend_if_cond(struct mmc_host *host,
 				    struct mmc_card *card)
 {
+	mmc_power_cycle(host, host->card->ocr);
 	sdio_reset(host);
 	mmc_go_idle(host);
 	mmc_send_if_cond(host, host->ocr_avail);
-- 
1.9.1