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Date: Fri, 21 Oct 2016 10:22:20 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Pramod Gurav <pramod.gurav@...aro.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>,
linux-mmc <linux-mmc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
Harjani Ritesh <riteshh@...eaurora.org>
Subject: Re: [PATCH v5] mmc: sdhci-msm: Add pm_runtime and system PM support
On 21 October 2016 at 08:42, Pramod Gurav <pramod.gurav@...aro.org> wrote:
> Provides runtime PM callbacks to enable and disable clock resources
> when idle. Also support system PM callbacks to be called during system
> suspend and resume.
>
> Reviewed-by: Ritesh Harjani <riteshh@...eaurora.org>
> Reviewed-by: Georgi Djakov <georgi.djakov@...aro.org>
> Tested-by: Ritesh Harjani <riteshh@...eaurora.org>
> Signed-off-by: Pramod Gurav <pramod.gurav@...aro.org>
Thanks, applied for next!
Kind regards
Uffe
> ---
> Tested on DB410C.
>
> Changes in v5:
> - Added pm_runtime_mark_last_busy in probe before calling autosuspend
> - included clock names in error logs
> - Used micro instead of constant for autosuspend delay
> - Removed platform_set_drvdata in probe as sdhci_pltfm_init does it.
> - Aligned PM ops structure with the parenthesis
>
> Changes in v4:
> - Remove calls to sdhci_runtime_resume_host/sdhci_runtime_suspend_host
> from runtime callbacks as sdhc msm controller is capable of restoring
> it's register values after clocks are disabled and re-enabled.
>
> Changes in v3:
> - Added CONFIG_PM around runtime pm function.
> - Replaced msm suspend/resume with generic function directly
> - Use SET_SYSTEM_SLEEP_PM_OPS instead of late version
>
> Changes in v2:
> - Moved pm_rutime enabling before adding host
> - Handled pm_rutime in remove
> - Changed runtime handling with reference from sdhci-of-at91.c
>
> drivers/mmc/host/sdhci-msm.c | 68 +++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 67 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 8ef44a2a..795f16f 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -18,6 +18,7 @@
> #include <linux/of_device.h>
> #include <linux/delay.h>
> #include <linux/mmc/mmc.h>
> +#include <linux/pm_runtime.h>
> #include <linux/slab.h>
>
> #include "sdhci-pltfm.h"
> @@ -68,6 +69,7 @@
> #define CMUX_SHIFT_PHASE_SHIFT 24
> #define CMUX_SHIFT_PHASE_MASK (7 << CMUX_SHIFT_PHASE_SHIFT)
>
> +#define MSM_MMC_AUTOSUSPEND_DELAY_MS 50
> struct sdhci_msm_host {
> struct platform_device *pdev;
> void __iomem *core_mem; /* MSM SDCC mapped address */
> @@ -658,12 +660,26 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> goto clk_disable;
> }
>
> + pm_runtime_get_noresume(&pdev->dev);
> + pm_runtime_set_active(&pdev->dev);
> + pm_runtime_enable(&pdev->dev);
> + pm_runtime_set_autosuspend_delay(&pdev->dev,
> + MSM_MMC_AUTOSUSPEND_DELAY_MS);
> + pm_runtime_use_autosuspend(&pdev->dev);
> +
> ret = sdhci_add_host(host);
> if (ret)
> - goto clk_disable;
> + goto pm_runtime_disable;
> +
> + pm_runtime_mark_last_busy(&pdev->dev);
> + pm_runtime_put_autosuspend(&pdev->dev);
>
> return 0;
>
> +pm_runtime_disable:
> + pm_runtime_disable(&pdev->dev);
> + pm_runtime_set_suspended(&pdev->dev);
> + pm_runtime_put_noidle(&pdev->dev);
> clk_disable:
> clk_disable_unprepare(msm_host->clk);
> pclk_disable:
> @@ -685,6 +701,11 @@ static int sdhci_msm_remove(struct platform_device *pdev)
> 0xffffffff);
>
> sdhci_remove_host(host, dead);
> +
> + pm_runtime_get_sync(&pdev->dev);
> + pm_runtime_disable(&pdev->dev);
> + pm_runtime_put_noidle(&pdev->dev);
> +
> clk_disable_unprepare(msm_host->clk);
> clk_disable_unprepare(msm_host->pclk);
> if (!IS_ERR(msm_host->bus_clk))
> @@ -693,12 +714,57 @@ static int sdhci_msm_remove(struct platform_device *pdev)
> return 0;
> }
>
> +#ifdef CONFIG_PM
> +static int sdhci_msm_runtime_suspend(struct device *dev)
> +{
> + struct sdhci_host *host = dev_get_drvdata(dev);
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> +
> + clk_disable_unprepare(msm_host->clk);
> + clk_disable_unprepare(msm_host->pclk);
> +
> + return 0;
> +}
> +
> +static int sdhci_msm_runtime_resume(struct device *dev)
> +{
> + struct sdhci_host *host = dev_get_drvdata(dev);
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + int ret;
> +
> + ret = clk_prepare_enable(msm_host->clk);
> + if (ret) {
> + dev_err(dev, "clk_enable failed for core_clk: %d\n", ret);
> + return ret;
> + }
> + ret = clk_prepare_enable(msm_host->pclk);
> + if (ret) {
> + dev_err(dev, "clk_enable failed for iface_clk: %d\n", ret);
> + clk_disable_unprepare(msm_host->clk);
> + return ret;
> + }
> +
> + return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops sdhci_msm_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> + pm_runtime_force_resume)
> + SET_RUNTIME_PM_OPS(sdhci_msm_runtime_suspend,
> + sdhci_msm_runtime_resume,
> + NULL)
> +};
> +
> static struct platform_driver sdhci_msm_driver = {
> .probe = sdhci_msm_probe,
> .remove = sdhci_msm_remove,
> .driver = {
> .name = "sdhci_msm",
> .of_match_table = sdhci_msm_dt_match,
> + .pm = &sdhci_msm_pm_ops,
> },
> };
>
> --
> 2.9.3
>
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