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mmc: sdhci-sprd: fixed incorrect clock divider

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The register SDHCI_CLOCK_CONTROL should be cleared before config clock
divider, otherwise the frequency configured maybe lower than we
expected.

Fixes: fb8bd90f83 ("mmc: sdhci-sprd: Add Spreadtrum's initial host controller")
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Signed-off-by: Chunyan Zhang <zhang.lyra@gmail.com>
Reviewed-by: Baolin Wang <baolin.wang@linaro.org>
Tested-by: Baolin Wang <baolin.wang@linaro.org>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Chunyan Zhang 2019-08-28 10:17:32 +08:00 committed by Ulf Hansson
parent 72741084d9
commit efdaf27517
1 changed files with 4 additions and 3 deletions
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7
drivers/mmc/host/sdhci-sprd.c
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@ -217,10 +217,11 @@ static inline void _sdhci_sprd_set_clock(struct sdhci_host *host,
struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
u32 div, val, mask;
div = sdhci_sprd_calc_div(sprd_host->base_rate, clk);
sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
clk |= ((div & 0x300) >> 2) | ((div & 0xFF) << 8);
sdhci_enable_clk(host, clk);
div = sdhci_sprd_calc_div(sprd_host->base_rate, clk);
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);