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Date: Fri, 21 Oct 2016 09:52:22 +0530
From: Pramod Gurav <pramod.gurav@...aro.org>
To: Ritesh Harjani <riteshh@...eaurora.org>
Cc: Ulf Hansson <ulf.hansson@...aro.org>,
Adrian Hunter <adrian.hunter@...el.com>,
linux-mmc <linux-mmc@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
"open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
linux-pm@...r.kernel.org
Subject: Re: [PATCH v4] mmc: sdhci-msm: Add pm_runtime and system PM support
Hi Ritesh,
On 20 October 2016 at 20:20, Ritesh Harjani <riteshh@...eaurora.org> wrote:
> Hi Pramod,
>
> Thanks for this patch. Few minor comments.
>
> I have tested your patch on db410c and 8996 based internal platform and it
> works fine.
Thanks for the review and testing.
>
>
>
> On 10/18/2016 3:46 PM, Pramod Gurav 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.
>>
>> Signed-off-by: Pramod Gurav <pramod.gurav@...aro.org>
>> ---
>>
>> Tested on DB410C.
>>
>> 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 | 66
>> +++++++++++++++++++++++++++++++++++++++++++-
>> 1 file changed, 65 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
>> index 8ef44a2a..33ec809 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"
>> @@ -658,12 +659,26 @@ 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, 50);
>
> Use a macro MSM_MMC_AUTOSUSPEND_DELAY_MS instead of using 50 directly here.
Will add.
>
>> + pm_runtime_use_autosuspend(&pdev->dev);
>> +
>> ret = sdhci_add_host(host);
>> if (ret)
>> - goto clk_disable;
>> + goto pm_runtime_disable;
>> +
>> + platform_set_drvdata(pdev, host);
>
> No need to set platform_set_drvdata here. sdhci_pltfm_init will do it
> anyways.
Good to know this. Will do away with this.
>
>> +
>
> pm_runtime_mark_last_busy(&pdev->dev) can be added here.
Yeah. Agree.
>
>> + 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 +700,11 @@ 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 +713,56 @@ 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: %d\n", 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: %d\n", ret);
>
> dev_err(dev, "clk enable failed for iface_clk: %d\n", ret);
>
Yes. will do these changes. Thanks for comments. :)
>> + 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,
>> },
>> };
>>
>>
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project
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