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| author | Wenchao Chen <wenchao.chen@unisoc.com> | 2022-12-07 13:19:09 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2022-12-09 10:32:58 +0100 |
| commit | ff874dbc4f868af128b412a9bd92637103cf11d7 (patch) | |
| tree | d18d19830a80962d387507c7021e00112910b4c8 /drivers/mmc | |
| parent | 19dafe9c6b86cc15979e514787fc743041ebc08d (diff) | |
| download | linux-stable-ff874dbc4f868af128b412a9bd92637103cf11d7.tar.gz linux-stable-ff874dbc4f868af128b412a9bd92637103cf11d7.tar.bz2 linux-stable-ff874dbc4f868af128b412a9bd92637103cf11d7.zip | |
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@unisoc.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20221207051909.32126-1-wenchao.chen@unisoc.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-sprd.c | 16 |
1 files 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); + } } } |