From: Wenchao Chen wenchao.chen@unisoc.com
commit ff874dbc4f868af128b412a9bd92637103cf11d7 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mmc/host/sdhci-sprd.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)
--- a/drivers/mmc/host/sdhci-sprd.c +++ b/drivers/mmc/host/sdhci-sprd.c @@ -223,13 +223,15 @@ static inline void _sdhci_sprd_set_clock 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); + } } }