From 192b5372421766f62fce20d2db2deb19a58e2cfc Mon Sep 17 00:00:00 2001 From: Jerry Huang Date: Sat, 4 Feb 2012 17:13:13 -0500 Subject: [PATCH] mmc: esdhc: Implement power management for ESDHC For FSL ESDHC controllers, when entering sleep the controller will power off, therefore the registers will lose their values, and the driver should save the value of registers during suspend and write them back during resume. Signed-off-by: Jerry Huang Signed-off-by: Jiang Yutang Acked-by: Anton Vorontsov Signed-off-by: Chris Ball --- drivers/mmc/host/sdhci-of-esdhc.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c index 5d876ff86f37..2ef52f47def8 100644 --- a/drivers/mmc/host/sdhci-of-esdhc.c +++ b/drivers/mmc/host/sdhci-of-esdhc.c @@ -114,6 +114,20 @@ static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host) return pltfm_host->clock / 256 / 16; } +#ifdef CONFIG_PM +static u32 esdhc_proctl; +static void esdhc_of_suspend(struct sdhci_host *host) +{ + esdhc_proctl = sdhci_be32bs_readl(host, SDHCI_HOST_CONTROL); +} + +static void esdhc_of_resume(struct sdhci_host *host) +{ + esdhc_of_enable_dma(host); + sdhci_be32bs_writel(host, esdhc_proctl, SDHCI_HOST_CONTROL); +} +#endif + static struct sdhci_ops sdhci_esdhc_ops = { .read_l = sdhci_be32bs_readl, .read_w = esdhc_readw, @@ -125,6 +139,10 @@ static struct sdhci_ops sdhci_esdhc_ops = { .enable_dma = esdhc_of_enable_dma, .get_max_clock = esdhc_of_get_max_clock, .get_min_clock = esdhc_of_get_min_clock, +#ifdef CONFIG_PM + .platform_suspend = esdhc_of_suspend, + .platform_resume = esdhc_of_resume, +#endif }; static struct sdhci_pltfm_data sdhci_esdhc_pdata = { -- 2.20.1