Re: [PATCH v2 2/4] misc: rtsx: Rework runtime power management flow

From: Kai-Heng Feng
Date: Thu Jan 20 2022 - 23:08:25 EST

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On Fri, Jan 21, 2022 at 11:57 AM Ricky WU <ricky_wu@xxxxxxxxxxx> wrote:
>
> > -----Original Message-----
> > From: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
> > Sent: Friday, January 21, 2022 9:41 AM
> > To: arnd@xxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; ulf.hansson@xxxxxxxxxx
> > Cc: linux-pm@xxxxxxxxxxxxxxx; Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>;
> > Ricky WU <ricky_wu@xxxxxxxxxxx>; Christophe JAILLET
> > <christophe.jaillet@xxxxxxxxxx>; Yang Li <yang.lee@xxxxxxxxxxxxxxxxx>;
> > linux-kernel@xxxxxxxxxxxxxxx
> > Subject: [PATCH v2 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.
> >
>
> This idle_work is not runtime_idle, this is for aspm setting
> Not only for support RPM, so this idle_work can not be remove....

rtsx_pm_power_saving() is called inside rtsx_pci_runtime_idle(), when
the usage refcount becomes zero, before runtime suspend routine.

>
> Our original Idle_work is a power saveing function, It is a delay_work for 200 msec ,
> If no work comes in 200 msec than go to idle_work to set power saveing setting.....

Have you tested it locally? rtsx_pci_runtime_idle() really does the same thing.

Kai-Heng

>
> > Fixes: 5b4258f6721f ("misc: rtsx: rts5249 support runtime PM")
> > Cc: Ricky WU <ricky_wu@xxxxxxxxxxx>
> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
> > ---
> > v2:
> > - Remove unused idle_work and rtd3_work from rtsx_pcr.
> >
> > drivers/misc/cardreader/rtsx_pcr.c | 123 +++++++++++------------------
> > include/linux/rtsx_pci.h | 3 -
> > 2 files changed, 44 insertions(+), 82 deletions(-)
> >
> > diff --git a/drivers/misc/cardreader/rtsx_pcr.c
> > b/drivers/misc/cardreader/rtsx_pcr.c
> > index 6ac509c1821c9..1dcf98b597569 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 +1580,16 @@ 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));
> > + if (pcr->rtd3_en) {
> > + pm_runtime_allow(&pcidev->dev);
> > + pm_runtime_put(&pcidev->dev);
> > + }
> >
> > return 0;
> >
> > @@ -1668,10 +1621,11 @@ 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;
> > + if (pcr->rtd3_en) {
> > + pm_runtime_get_sync(&pcidev->dev);
> > + pm_runtime_forbid(&pcidev->dev);
> > + }
> >
> > /* Disable interrupts at the pcr level */
> > spin_lock_irq(&pcr->lock);
> > @@ -1680,9 +1634,6 @@ 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 +1651,6 @@ 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 +1672,6 @@ 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 +1705,6 @@ 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 +1729,32 @@ 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);
> > +
> > + 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 +1763,29 @@
> > 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);
> > + if (!pcr->rtd3_en)
> > + return -EBUSY;
> > +
> > + 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 +1801,6 @@ 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 +1815,7 @@ 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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