From: Rajvi Jingar <rajvi.jingar@linux.intel.com>
To: rafael.j.wysocki@intel.com, bhelgaas@google.com
Cc: rajvi.jingar@linux.intel.com, david.e.box@linux.intel.com,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org
Subject: [PATCH v7 1/2] PCI/PM: refactor pci_pm_suspend_noirq()
Date: Wed, 8 Jun 2022 17:10:06 -0700 [thread overview]
Message-ID: <20220609001007.533242-1-rajvi.jingar@linux.intel.com> (raw)
The state of the device is saved during pci_pm_suspend_noirq(), if it
has not already been saved, regardless of the skip_bus_pm flag value. So
skip_bus_pm check is removed before saving the device state.
Signed-off-by: Rajvi Jingar <rajvi.jingar@linux.intel.com>
Suggested-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
v1 -> v2: add comments to the changes
v2 -> v3: move changelog after "---" marker
v3 -> v4: add "---" marker after changelog
v4 -> v5: no change
v5 -> v6: no change
v6 -> v7: no change
---
drivers/pci/pci-driver.c | 18 ++++++------------
1 file changed, 6 insertions(+), 12 deletions(-)
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 49238ddd39ee..1f64de3e5280 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -867,20 +867,14 @@ static int pci_pm_suspend_noirq(struct device *dev)
}
}
- if (pci_dev->skip_bus_pm) {
+ if (!pci_dev->state_saved) {
+ pci_save_state(pci_dev);
/*
- * Either the device is a bridge with a child in D0 below it, or
- * the function is running for the second time in a row without
- * going through full resume, which is possible only during
- * suspend-to-idle in a spurious wakeup case. The device should
- * be in D0 at this point, but if it is a bridge, it may be
- * necessary to save its state.
+ * If the device is a bridge with a child in D0 below it, it needs to
+ * stay in D0, so check skip_bus_pm to avoid putting it into a
+ * low-power state in that case.
*/
- if (!pci_dev->state_saved)
- pci_save_state(pci_dev);
- } else if (!pci_dev->state_saved) {
- pci_save_state(pci_dev);
- if (pci_power_manageable(pci_dev))
+ if (!pci_dev->skip_bus_pm && pci_power_manageable(pci_dev))
pci_prepare_to_sleep(pci_dev);
}
--
2.25.1
next reply other threads:[~2022-06-09 0:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-09 0:10 Rajvi Jingar [this message]
2022-06-09 0:10 ` [PATCH v7 2/2] PCI/PM: Disable PTM on all devices Rajvi Jingar
2022-06-11 0:12 ` Bjorn Helgaas
2022-07-07 16:17 ` Rafael J. Wysocki
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