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Message-ID: <20221207051909.32126-1-wenchao.chen@unisoc.com>
Date: Wed, 7 Dec 2022 13:19:09 +0800
From: Wenchao Chen <wenchao.chen@...soc.com>
To: <adrian.hunter@...el.com>, <ulf.hansson@...aro.org>,
<orsonzhai@...il.com>, <baolin.wang@...ux.alibaba.com>,
<zhang.lyra@...il.com>
CC: <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<zhenxiong.lai@...soc.com>, <yuelin.tang@...soc.com>
Subject: [PATCH] mmc: sdhci-sprd: Disable CLK_AUTO when the clock is less than 400K
When the clock is less than 400K, some SD cards fail to initialize
because CLK_AUTO is enabled.
Fixes: fb8bd90f83c4 ("mmc: sdhci-sprd: Add Spreadtrum's initial host controller")
Signed-off-by: Wenchao Chen <wenchao.chen@...soc.com>
---
drivers/mmc/host/sdhci-sprd.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
index bec3f9e3cd3f..525f979e2a97 100644
--- a/drivers/mmc/host/sdhci-sprd.c
+++ b/drivers/mmc/host/sdhci-sprd.c
@@ -228,13 +228,15 @@ static inline void _sdhci_sprd_set_clock(struct sdhci_host *host,
div = ((div & 0x300) >> 2) | ((div & 0xFF) << 8);
sdhci_enable_clk(host, div);
- /* enable auto gate sdhc_enable_auto_gate */
- 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);
+ /* 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);
+ }
}
}
--
2.17.1
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