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| author | Hu Ziji <huziji@marvell.com> | 2017-07-12 15:16:19 -0700 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2017-08-30 14:01:57 +0200 |
| commit | a0fd95b30edb12d8be714674dbd5377b0441786b (patch) | |
| tree | a38718df166481f875cafcffd857926863446bb7 | |
| parent | 03de19212ea3bce221e0e79dba8752ddc5b350cb (diff) | |
| download | linux-stable-a0fd95b30edb12d8be714674dbd5377b0441786b.tar.gz linux-stable-a0fd95b30edb12d8be714674dbd5377b0441786b.tar.bz2 linux-stable-a0fd95b30edb12d8be714674dbd5377b0441786b.zip | |
mmc: sdhci-xenon: Add Xenon SDHCI specific system-level PM support
Add Xenon specific system-level suspend and resume support.
Especially during resume, re-configure Xenon specific registers
since registers setting will be lost in suspend if Xenon is power off.
Signed-off-by: Hu Ziji <huziji@marvell.com>
Signed-off-by: Zhoujie Wu <zjwu@marvell.com>
Tested-by: Jisheng Zhang <jszhang@marvell.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
| -rw-r--r-- | drivers/mmc/host/sdhci-xenon.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c index edd4d9151071..6012926b1aed 100644 --- a/drivers/mmc/host/sdhci-xenon.c +++ b/drivers/mmc/host/sdhci-xenon.c @@ -518,6 +518,46 @@ static int xenon_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int xenon_suspend(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + int ret; + + ret = sdhci_suspend_host(host); + if (ret) + return ret; + + clk_disable_unprepare(pltfm_host->clk); + return ret; +} + +static int xenon_resume(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + int ret; + + ret = clk_prepare_enable(pltfm_host->clk); + if (ret) + return ret; + + /* + * If SoCs power off the entire Xenon, registers setting will + * be lost. + * Re-configure Xenon specific register to enable current SDHC + */ + ret = xenon_sdhc_prepare(host); + if (ret) + return ret; + + return sdhci_resume_host(host); +} +#endif + +static SIMPLE_DEV_PM_OPS(xenon_pmops, xenon_suspend, xenon_resume); + static const struct of_device_id sdhci_xenon_dt_ids[] = { { .compatible = "marvell,armada-ap806-sdhci",}, { .compatible = "marvell,armada-cp110-sdhci",}, @@ -530,7 +570,7 @@ static struct platform_driver sdhci_xenon_driver = { .driver = { .name = "xenon-sdhci", .of_match_table = sdhci_xenon_dt_ids, - .pm = &sdhci_pltfm_pmops, + .pm = &xenon_pmops, }, .probe = xenon_probe, .remove = xenon_remove, |