diff options
| author | Chunyan Zhang <chunyan.zhang@unisoc.com> | 2019-08-28 10:17:32 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2019-08-30 09:17:53 +0200 |
| commit | efdaf27517a892238e0dfa046cd91184b039d681 (patch) | |
| tree | 1a3fc1abcd41bc52f9b4efc677ac667c7e13fe42 | |
| parent | 72741084d903e65e121c27bd29494d941729d4a1 (diff) | |
| download | linux-efdaf27517a892238e0dfa046cd91184b039d681.tar.gz | |
mmc: sdhci-sprd: fixed incorrect clock divider
The register SDHCI_CLOCK_CONTROL should be cleared before config clock
divider, otherwise the frequency configured maybe lower than we
expected.
Fixes: fb8bd90f83c4 ("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>
| -rw-r--r-- | drivers/mmc/host/sdhci-sprd.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c index 83a4767ca680f4..25f2fc4ce08f65 100644 --- a/drivers/mmc/host/sdhci-sprd.c +++ b/drivers/mmc/host/sdhci-sprd.c @@ -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); |