linux-kernel - [PATCH] mmc: sprd: Fix eMMC init failure after hw reset

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Message-ID: <20231204064934.21236-1-wenchao.chen@unisoc.com>
Date:   Mon, 4 Dec 2023 14:49:34 +0800
From:   Wenchao Chen <wenchao.chen@...soc.com>
To:     <ulf.hansson@...aro.org>, <zhang.lyra@...il.com>,
        <orsonzhai@...il.com>, <baolin.wang@...ux.alibaba.com>
CC:     <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <wenchao.chen666@...il.com>, <zhenxiong.lai@...soc.com>,
        <yuelin.tang@...soc.com>, Wenchao Chen <wenchao.chen@...soc.com>
Subject: [PATCH] mmc: sprd: Fix eMMC init failure after hw reset

Some eMMC devices that do not close the auto clk gate
after hw reset will cause eMMC initialization to fail.

Signed-off-by: Wenchao Chen <wenchao.chen@...soc.com>
---
 drivers/mmc/host/sdhci-sprd.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
index 6b8a57e2d20f..bed57a1c64b5 100644
--- a/drivers/mmc/host/sdhci-sprd.c
+++ b/drivers/mmc/host/sdhci-sprd.c
@@ -239,15 +239,19 @@ static inline void _sdhci_sprd_set_clock(struct sdhci_host *host,
 	div = ((div & 0x300) >> 2) | ((div & 0xFF) << 8);
 	sdhci_enable_clk(host, div);
 
+	val = sdhci_readl(host, SDHCI_SPRD_REG_32_BUSY_POSI);
+	mask = SDHCI_SPRD_BIT_OUTR_CLK_AUTO_EN | SDHCI_SPRD_BIT_INNR_CLK_AUTO_EN;
 	/* Enable CLK_AUTO when the clock is greater than 400K. */
 	if (clk > 400000) {
-		val = sdhci_readl(host, SDHCI_SPRD_REG_32_BUSY_POSI);
-		mask = SDHCI_SPRD_BIT_OUTR_CLK_AUTO_EN |
-			SDHCI_SPRD_BIT_INNR_CLK_AUTO_EN;
 		if (mask != (val & mask)) {
 			val |= mask;
 			sdhci_writel(host, val, SDHCI_SPRD_REG_32_BUSY_POSI);
 		}
+	} else {
+		if (val & mask) {
+			val &= ~mask;
+			sdhci_writel(host, val, SDHCI_SPRD_REG_32_BUSY_POSI);
+		}
 	}
 }
 
-- 
2.17.1