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Message-Id: <20220121063138.1723616-1-kai.heng.feng@canonical.com>
Date: Fri, 21 Jan 2022 14:31:35 +0800
From: Kai-Heng Feng <kai.heng.feng@...onical.com>
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.
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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