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mmc: sdhci-sprd: Disable CLK_AUTO when the clock is less than 400K

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commit ff874dbc4f868af128b412a9bd92637103cf11d7 upstream.

When the clock is less than 400K, some SD cards fail to initialize
because CLK_AUTO is enabled.

Fixes: fb8bd90f83 ("mmc: sdhci-sprd: Add Spreadtrum's initial host controller")
Signed-off-by: Wenchao Chen <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Wenchao Chen 2022-12-07 13:19:09 +08:00 • committed by Greg Kroah-Hartman
commit e63e1c6793
1 changed files with 9 additions and 7 deletions
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16
drivers/mmc/host/sdhci-sprd.c
View file

@ -223,13 +223,15 @@ 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);
}
}
}