diff options
| author | Liming Sun <limings@nvidia.com> | 2023-08-22 22:59:29 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2023-08-24 13:57:20 +0300 |
| commit | 48fe8fadbe5e03edfd83315c331b171a9ae245a4 (patch) | |
| tree | ce63b8b8144b3d2c959b12bb1dff2fe7264ec588 /drivers/mmc | |
| parent | a11937b3cff5449871f428e46e202481dc61a9de (diff) | |
| download | linux-48fe8fadbe5e03edfd83315c331b171a9ae245a4.tar.xz | |
mmc: sdhci-of-dwcmshc: Add runtime PM operations
This commit implements the runtime PM operations to disable eMMC card clock
when idle.
Reviewed-by: David Thompson <davthompson@nvidia.com>
Signed-off-by: Liming Sun <limings@nvidia.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20230822195929.168552-2-limings@nvidia.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-of-dwcmshc.c | 64 |
1 files changed, 62 insertions, 2 deletions
diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c index bc332a035032..3a3bae6948a8 100644 --- a/drivers/mmc/host/sdhci-of-dwcmshc.c +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c @@ -15,6 +15,7 @@ #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/reset.h> #include <linux/sizes.h> @@ -548,9 +549,13 @@ static int dwcmshc_probe(struct platform_device *pdev) host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY; + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + err = sdhci_setup_host(host); if (err) - goto err_clk; + goto err_rpm; if (rk_priv) dwcmshc_rk35xx_postinit(host, priv); @@ -559,10 +564,15 @@ static int dwcmshc_probe(struct platform_device *pdev) if (err) goto err_setup_host; + pm_runtime_put(dev); + return 0; err_setup_host: sdhci_cleanup_host(host); +err_rpm: + pm_runtime_disable(dev); + pm_runtime_put_noidle(dev); err_clk: clk_disable_unprepare(pltfm_host->clk); clk_disable_unprepare(priv->bus_clk); @@ -600,6 +610,8 @@ static int dwcmshc_suspend(struct device *dev) struct rk35xx_priv *rk_priv = priv->priv; int ret; + pm_runtime_resume(dev); + ret = sdhci_suspend_host(host); if (ret) return ret; @@ -659,7 +671,55 @@ disable_clk: } #endif -static SIMPLE_DEV_PM_OPS(dwcmshc_pmops, dwcmshc_suspend, dwcmshc_resume); +#ifdef CONFIG_PM + +static void dwcmshc_enable_card_clk(struct sdhci_host *host) +{ + u16 ctrl; + + ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + if ((ctrl & SDHCI_CLOCK_INT_EN) && !(ctrl & SDHCI_CLOCK_CARD_EN)) { + ctrl |= SDHCI_CLOCK_CARD_EN; + sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL); + } +} + +static void dwcmshc_disable_card_clk(struct sdhci_host *host) +{ + u16 ctrl; + + ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + if (ctrl & SDHCI_CLOCK_CARD_EN) { + ctrl &= ~SDHCI_CLOCK_CARD_EN; + sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL); + } +} + +static int dwcmshc_runtime_suspend(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + + dwcmshc_disable_card_clk(host); + + return 0; +} + +static int dwcmshc_runtime_resume(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + + dwcmshc_enable_card_clk(host); + + return 0; +} + +#endif + +static const struct dev_pm_ops dwcmshc_pmops = { + SET_SYSTEM_SLEEP_PM_OPS(dwcmshc_suspend, dwcmshc_resume) + SET_RUNTIME_PM_OPS(dwcmshc_runtime_suspend, + dwcmshc_runtime_resume, NULL) +}; static struct platform_driver sdhci_dwcmshc_driver = { .driver = { |