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mmc: sdhci-of-esdhc: fix reference clock source selection

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The bit ESDHC_PERIPHERAL_CLK_SEL to select using peripheral clock
or platform clock is not able to be reset by SDHCI_RESET_ALL.
So driver needs to initialize it as 1 or 0 once, to override the
different value which may be configured in bootloader.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Link: https://lore.kernel.org/r/20200927082304.9232-1-yangbo.lu@nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Yangbo Lu 2020-09-27 16:23:04 +08:00 committed by Ulf Hansson
parent 3157b035f4
commit 975520fc73
1 changed files with 12 additions and 6 deletions
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18
drivers/mmc/host/sdhci-of-esdhc.c
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@ -1360,13 +1360,19 @@ static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
clk_put(clk);
}
if (esdhc->peripheral_clock) {
esdhc_clock_enable(host, false);
val = sdhci_readl(host, ESDHC_DMA_SYSCTL);
esdhc_clock_enable(host, false);
val = sdhci_readl(host, ESDHC_DMA_SYSCTL);
/*
* This bit is not able to be reset by SDHCI_RESET_ALL. Need to
* initialize it as 1 or 0 once, to override the different value
* which may be configured in bootloader.
*/
if (esdhc->peripheral_clock)
val |= ESDHC_PERIPHERAL_CLK_SEL;
sdhci_writel(host, val, ESDHC_DMA_SYSCTL);
esdhc_clock_enable(host, true);
}
else
val &= ~ESDHC_PERIPHERAL_CLK_SEL;
sdhci_writel(host, val, ESDHC_DMA_SYSCTL);
esdhc_clock_enable(host, true);
}
static int esdhc_hs400_prepare_ddr(struct mmc_host *mmc)