Date:   Fri, 21 Jan 2022 09:58:54 +0000
From:   Ricky WU <ricky_wu@...ltek.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>
CC:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 2/4] misc: rtsx: Rework runtime power management flow

> -----Original Message-----
> From: Kai-Heng Feng <kai.heng.feng@...onical.com>
> Sent: Friday, January 21, 2022 2:32 PM
> To: arnd@...db.de; gregkh@...uxfoundation.org; ulf.hansson@...aro.org
> Cc: linux-pm@...r.kernel.org; Kai-Heng Feng <kai.heng.feng@...onical.com>;
> Ricky WU <ricky_wu@...ltek.com>; Christophe JAILLET
> <christophe.jaillet@...adoo.fr>; Yang Li <yang.lee@...ux.alibaba.com>;
> linux-kernel@...r.kernel.org
> Subject: [PATCH v3 2/4] misc: rtsx: Rework runtime power management flow
> 
> Commit 5b4258f6721f ("misc: rtsx: rts5249 support runtime PM") uses
> "rtd3_work" and "idle_work" to manage it's own runtime PM state machine.
> 
> When its child device, rtsx_pci_sdmmc, uses runtime PM refcount correctly, all
> the additional works can be managed by generic runtime PM helpers.
> 
> So consolidate "idle_work" and "rtd3_work" into generic runtime idle callback
> and runtime suspend callback, respectively.


Original idle_work is for aspm delay time is 200 msec, because Aspm can quick in and out to save more power
Now this patch need to wait 5 sec because set autosuspend time set to 5 sec in sdmmc,... this time need to set to 200 msec.

But it will get another question, the question is the host(sdmmc) caps has set MMC_CAP_AGGRESSIVE_PM when rtd3_en is set,
It will make card power off when sdmmc go to suspend, 200 msec will cause card power off and on frequently

Need to remove this flag in caps, and then change card power off to rtsx_pci_runtime_suspend()....

What do you think?

Ricky

> 
> Fixes: 5b4258f6721f ("misc: rtsx: rts5249 support runtime PM")
> Cc: Ricky WU <ricky_wu@...ltek.com>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
> v3:
>  - Allow runtime PM for all devices, but only schedule runtime suspend
>    for devices with rtd3_en flagged.
> 
> v2:
>  - Remove unused idle_work and rtd3_work from rtsx_pcr.
> 
>  drivers/misc/cardreader/rtsx_pcr.c | 118 ++++++++++-------------------
>  include/linux/rtsx_pci.h           |   3 -
>  2 files changed, 39 insertions(+), 82 deletions(-)
> 
> diff --git a/drivers/misc/cardreader/rtsx_pcr.c
> b/drivers/misc/cardreader/rtsx_pcr.c
> index 6ac509c1821c9..f919290f01192 100644
> --- a/drivers/misc/cardreader/rtsx_pcr.c
> +++ b/drivers/misc/cardreader/rtsx_pcr.c
> @@ -152,20 +152,12 @@ void rtsx_pci_start_run(struct rtsx_pcr *pcr)
>  	if (pcr->remove_pci)
>  		return;
> 
> -	if (pcr->rtd3_en)
> -		if (pcr->is_runtime_suspended) {
> -			pm_runtime_get(&(pcr->pci->dev));
> -			pcr->is_runtime_suspended = false;
> -		}
> -
>  	if (pcr->state != PDEV_STAT_RUN) {
>  		pcr->state = PDEV_STAT_RUN;
>  		if (pcr->ops->enable_auto_blink)
>  			pcr->ops->enable_auto_blink(pcr);
>  		rtsx_pm_full_on(pcr);
>  	}
> -
> -	mod_delayed_work(system_wq, &pcr->idle_work, msecs_to_jiffies(200));
>  }
>  EXPORT_SYMBOL_GPL(rtsx_pci_start_run);
> 
> @@ -1094,40 +1086,6 @@ static void rtsx_pm_power_saving(struct rtsx_pcr
> *pcr)
>  	rtsx_comm_pm_power_saving(pcr);
>  }
> 
> -static void rtsx_pci_rtd3_work(struct work_struct *work) -{
> -	struct delayed_work *dwork = to_delayed_work(work);
> -	struct rtsx_pcr *pcr = container_of(dwork, struct rtsx_pcr, rtd3_work);
> -
> -	pcr_dbg(pcr, "--> %s\n", __func__);
> -	if (!pcr->is_runtime_suspended)
> -		pm_runtime_put(&(pcr->pci->dev));
> -}
> -
> -static void rtsx_pci_idle_work(struct work_struct *work) -{
> -	struct delayed_work *dwork = to_delayed_work(work);
> -	struct rtsx_pcr *pcr = container_of(dwork, struct rtsx_pcr, idle_work);
> -
> -	pcr_dbg(pcr, "--> %s\n", __func__);
> -
> -	mutex_lock(&pcr->pcr_mutex);
> -
> -	pcr->state = PDEV_STAT_IDLE;
> -
> -	if (pcr->ops->disable_auto_blink)
> -		pcr->ops->disable_auto_blink(pcr);
> -	if (pcr->ops->turn_off_led)
> -		pcr->ops->turn_off_led(pcr);
> -
> -	rtsx_pm_power_saving(pcr);
> -
> -	mutex_unlock(&pcr->pcr_mutex);
> -
> -	if (pcr->rtd3_en)
> -		mod_delayed_work(system_wq, &pcr->rtd3_work,
> msecs_to_jiffies(10000));
> -}
> -
>  static void rtsx_base_force_power_down(struct rtsx_pcr *pcr, u8 pm_state)
> {
>  	/* Set relink_time to 0 */
> @@ -1598,7 +1556,6 @@ static int rtsx_pci_probe(struct pci_dev *pcidev,
>  	pcr->card_inserted = 0;
>  	pcr->card_removed = 0;
>  	INIT_DELAYED_WORK(&pcr->carddet_work, rtsx_pci_card_detect);
> -	INIT_DELAYED_WORK(&pcr->idle_work, rtsx_pci_idle_work);
> 
>  	pcr->msi_en = msi_en;
>  	if (pcr->msi_en) {
> @@ -1623,20 +1580,14 @@ static int rtsx_pci_probe(struct pci_dev *pcidev,
>  		rtsx_pcr_cells[i].pdata_size = sizeof(*handle);
>  	}
> 
> -	if (pcr->rtd3_en) {
> -		INIT_DELAYED_WORK(&pcr->rtd3_work, rtsx_pci_rtd3_work);
> -		pm_runtime_allow(&pcidev->dev);
> -		pm_runtime_enable(&pcidev->dev);
> -		pcr->is_runtime_suspended = false;
> -	}
> -
> 
>  	ret = mfd_add_devices(&pcidev->dev, pcr->id, rtsx_pcr_cells,
>  			ARRAY_SIZE(rtsx_pcr_cells), NULL, 0, NULL);
>  	if (ret < 0)
>  		goto free_slots;
> 
> -	schedule_delayed_work(&pcr->idle_work, msecs_to_jiffies(200));
> +	pm_runtime_allow(&pcidev->dev);
> +	pm_runtime_put(&pcidev->dev);
> 
>  	return 0;
> 
> @@ -1668,11 +1619,11 @@ static void rtsx_pci_remove(struct pci_dev
> *pcidev)
>  	struct pcr_handle *handle = pci_get_drvdata(pcidev);
>  	struct rtsx_pcr *pcr = handle->pcr;
> 
> -	if (pcr->rtd3_en)
> -		pm_runtime_get_noresume(&pcr->pci->dev);
> -
>  	pcr->remove_pci = true;
> 
> +	pm_runtime_get_sync(&pcidev->dev);
> +	pm_runtime_forbid(&pcidev->dev);
> +
>  	/* Disable interrupts at the pcr level */
>  	spin_lock_irq(&pcr->lock);
>  	rtsx_pci_writel(pcr, RTSX_BIER, 0);
> @@ -1680,9 +1631,6 @@ static void rtsx_pci_remove(struct pci_dev *pcidev)
>  	spin_unlock_irq(&pcr->lock);
> 
>  	cancel_delayed_work_sync(&pcr->carddet_work);
> -	cancel_delayed_work_sync(&pcr->idle_work);
> -	if (pcr->rtd3_en)
> -		cancel_delayed_work_sync(&pcr->rtd3_work);
> 
>  	mfd_remove_devices(&pcidev->dev);
> 
> @@ -1700,11 +1648,6 @@ static void rtsx_pci_remove(struct pci_dev
> *pcidev)
>  	idr_remove(&rtsx_pci_idr, pcr->id);
>  	spin_unlock(&rtsx_pci_lock);
> 
> -	if (pcr->rtd3_en) {
> -		pm_runtime_disable(&pcr->pci->dev);
> -		pm_runtime_put_noidle(&pcr->pci->dev);
> -	}
> -
>  	kfree(pcr->slots);
>  	kfree(pcr);
>  	kfree(handle);
> @@ -1726,7 +1669,6 @@ static int __maybe_unused rtsx_pci_suspend(struct
> device *dev_d)
>  	pcr = handle->pcr;
> 
>  	cancel_delayed_work(&pcr->carddet_work);
> -	cancel_delayed_work(&pcr->idle_work);
> 
>  	mutex_lock(&pcr->pcr_mutex);
> 
> @@ -1760,8 +1702,6 @@ static int __maybe_unused rtsx_pci_resume(struct
> device *dev_d)
>  	if (ret)
>  		goto out;
> 
> -	schedule_delayed_work(&pcr->idle_work, msecs_to_jiffies(200));
> -
>  out:
>  	mutex_unlock(&pcr->pcr_mutex);
>  	return ret;
> @@ -1786,6 +1726,33 @@ static void rtsx_pci_shutdown(struct pci_dev
> *pcidev)
>  		pci_disable_msi(pcr->pci);
>  }
> 
> +static int rtsx_pci_runtime_idle(struct device *device) {
> +	struct pci_dev *pcidev = to_pci_dev(device);
> +	struct pcr_handle *handle = pci_get_drvdata(pcidev);
> +	struct rtsx_pcr *pcr = handle->pcr;
> +
> +	dev_dbg(device, "--> %s\n", __func__);
> +
> +	mutex_lock(&pcr->pcr_mutex);
> +
> +	pcr->state = PDEV_STAT_IDLE;
> +
> +	if (pcr->ops->disable_auto_blink)
> +		pcr->ops->disable_auto_blink(pcr);
> +	if (pcr->ops->turn_off_led)
> +		pcr->ops->turn_off_led(pcr);
> +
> +	rtsx_pm_power_saving(pcr);
> +
> +	mutex_unlock(&pcr->pcr_mutex);
> +
> +	if (pcr->rtd3_en)
> +		pm_schedule_suspend(device, 5000);
> +
> +	return -EBUSY;
> +}
> +
>  static int rtsx_pci_runtime_suspend(struct device *device)  {
>  	struct pci_dev *pcidev = to_pci_dev(device); @@ -1794,31 +1761,26 @@
> static int rtsx_pci_runtime_suspend(struct device *device)
> 
>  	handle = pci_get_drvdata(pcidev);
>  	pcr = handle->pcr;
> -	dev_dbg(&(pcidev->dev), "--> %s\n", __func__);
> 
> -	cancel_delayed_work(&pcr->carddet_work);
> -	cancel_delayed_work(&pcr->rtd3_work);
> -	cancel_delayed_work(&pcr->idle_work);
> +	dev_dbg(device, "--> %s\n", __func__);
> +
> +	cancel_delayed_work_sync(&pcr->carddet_work);
> 
>  	mutex_lock(&pcr->pcr_mutex);
>  	rtsx_pci_power_off(pcr, HOST_ENTER_S3);
> 
>  	mutex_unlock(&pcr->pcr_mutex);
> 
> -	pcr->is_runtime_suspended = true;
> -
>  	return 0;
>  }
> 
>  static int rtsx_pci_runtime_resume(struct device *device)  {
>  	struct pci_dev *pcidev = to_pci_dev(device);
> -	struct pcr_handle *handle;
> -	struct rtsx_pcr *pcr;
> +	struct pcr_handle *handle = pci_get_drvdata(pcidev);
> +	struct rtsx_pcr *pcr = handle->pcr;
> 
> -	handle = pci_get_drvdata(pcidev);
> -	pcr = handle->pcr;
> -	dev_dbg(&(pcidev->dev), "--> %s\n", __func__);
> +	dev_dbg(device, "--> %s\n", __func__);
> 
>  	mutex_lock(&pcr->pcr_mutex);
> 
> @@ -1834,8 +1796,6 @@ static int rtsx_pci_runtime_resume(struct device
> *device)
>  				pcr->slots[RTSX_SD_CARD].p_dev);
>  	}
> 
> -	schedule_delayed_work(&pcr->idle_work, msecs_to_jiffies(200));
> -
>  	mutex_unlock(&pcr->pcr_mutex);
>  	return 0;
>  }
> @@ -1850,7 +1810,7 @@ static int rtsx_pci_runtime_resume(struct device
> *device)
> 
>  static const struct dev_pm_ops rtsx_pci_pm_ops = {
>  	SET_SYSTEM_SLEEP_PM_OPS(rtsx_pci_suspend, rtsx_pci_resume)
> -	SET_RUNTIME_PM_OPS(rtsx_pci_runtime_suspend,
> rtsx_pci_runtime_resume, NULL)
> +	SET_RUNTIME_PM_OPS(rtsx_pci_runtime_suspend,
> rtsx_pci_runtime_resume,
> +rtsx_pci_runtime_idle)
>  };
> 
>  static struct pci_driver rtsx_pci_driver = { diff --git a/include/linux/rtsx_pci.h
> b/include/linux/rtsx_pci.h index 4ab7bfc675f11..89b7d34e25b63 100644
> --- a/include/linux/rtsx_pci.h
> +++ b/include/linux/rtsx_pci.h
> @@ -1201,8 +1201,6 @@ struct rtsx_pcr {
>  	unsigned int			card_exist;
> 
>  	struct delayed_work		carddet_work;
> -	struct delayed_work		idle_work;
> -	struct delayed_work		rtd3_work;
> 
>  	spinlock_t			lock;
>  	struct mutex			pcr_mutex;
> @@ -1212,7 +1210,6 @@ struct rtsx_pcr {
>  	unsigned int			cur_clock;
>  	bool				remove_pci;
>  	bool				msi_en;
> -	bool				is_runtime_suspended;
> 
>  #define EXTRA_CAPS_SD_SDR50		(1 << 0)
>  #define EXTRA_CAPS_SD_SDR104		(1 << 1)
> --
> 2.33.1

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