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mmc: sdhci-of-dwcmshc: add suspend/resume support

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Add dwcmshc specific system-level suspend and resume support.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Link: https://lore.kernel.org/r/20200515141926.52e088fe@xhacker.debian
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jisheng Zhang
2020-05-15 14:19:26 +08:00
committed by Ulf Hansson
parent 554232e8d5
commit bccce2ec77
1 changed files with 43 additions and 0 deletions
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43
drivers/mmc/host/sdhci-of-dwcmshc.c
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@@ -163,6 +163,48 @@ static int dwcmshc_remove(struct platform_device *pdev)
return 0; return 0;
} }
#ifdef CONFIG_PM_SLEEP
static int dwcmshc_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
int ret;
ret = sdhci_suspend_host(host);
if (ret)
return ret;
clk_disable_unprepare(pltfm_host->clk);
if (!IS_ERR(priv->bus_clk))
clk_disable_unprepare(priv->bus_clk);
return ret;
}
static int dwcmshc_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
int ret;
ret = clk_prepare_enable(pltfm_host->clk);
if (ret)
return ret;
if (!IS_ERR(priv->bus_clk)) {
ret = clk_prepare_enable(priv->bus_clk);
if (ret)
return ret;
}
return sdhci_resume_host(host);
}
#endif
static SIMPLE_DEV_PM_OPS(dwcmshc_pmops, dwcmshc_suspend, dwcmshc_resume);
static const struct of_device_id sdhci_dwcmshc_dt_ids[] = { static const struct of_device_id sdhci_dwcmshc_dt_ids[] = {
{ .compatible = "snps,dwcmshc-sdhci" }, { .compatible = "snps,dwcmshc-sdhci" },
{} {}
@@ -173,6 +215,7 @@ static struct platform_driver sdhci_dwcmshc_driver = {
.driver = { .driver = {
.name = "sdhci-dwcmshc", .name = "sdhci-dwcmshc",
.of_match_table = sdhci_dwcmshc_dt_ids, .of_match_table = sdhci_dwcmshc_dt_ids,
.pm = &dwcmshc_pmops,
}, },
.probe = dwcmshc_probe, .probe = dwcmshc_probe,
.remove = dwcmshc_remove, .remove = dwcmshc_remove,