diff options
| author |   Yangbo Lu <yangbo.lu@nxp.com> | 2020-09-27 16:23:04 +0800 |
|---|---|---|
| committer |   Ulf Hansson <ulf.hansson@linaro.org> | 2020-09-28 12:22:45 +0200 |
| commit | 975520fc73809a3a0904f0c67d8640945696e798 (patch) | |
| tree | 8c4ce770405d684c2fbdf507cfdf8b8424becf75 | |
| parent | mmc: host: fix depends for MMC_MESON_GX w/ COMPILE_TEST (diff) | |
| download | wireguard-linux-975520fc73809a3a0904f0c67d8640945696e798.tar.xz wireguard-linux-975520fc73809a3a0904f0c67d8640945696e798.zip | |
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: 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>
| -rw-r--r-- | drivers/mmc/host/sdhci-of-esdhc.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c index 3a3340c9b8c9..0b45eff6fed4 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) |