Commit 975520fc authored by Yangbo Lu's avatar Yangbo Lu Committed by Ulf Hansson
Browse files

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



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: default avatarYangbo Lu <yangbo.lu@nxp.com>
Link: https://lore.kernel.org/r/20200927082304.9232-1-yangbo.lu@nxp.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 3157b035

drivers/mmc/host/sdhci-of-esdhc.c

+12 −6
Original line number Diff line number Diff line
@@ -1360,14 +1360,20 @@ 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);

	/*

	 * 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;

	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)

{