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@xxxxxxx>
---
drivers/mmc/host/sdhci-of-esdhc.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 3a3340c..0b45eff 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -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)
--
2.7.4
