linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Linux PCI <linux-pci@vger.kernel.org>
Cc: Linux PM <linux-pm@vger.kernel.org>,
	Linux ACPI <linux-acpi@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Bjorn Helgaas <helgaas@kernel.org>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Keith Busch <kbusch@kernel.org>,
	Kai-Heng Feng <kai.heng.feng@canonical.com>
Subject: [PATCH] PCI: PM: Skip devices in D0 for suspend-to-idle
Date: Thu, 13 Jun 2019 00:14:02 +0200	[thread overview]
Message-ID: <2513600.jR9RdVMSR0@kreacher> (raw)

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Commit d491f2b75237 ("PCI: PM: Avoid possible suspend-to-idle issue")
attempted to avoid a problem with devices whose drivers want them to
stay in D0 over suspend-to-idle and resume, but it did not go as far
as it should with that.

Namely, first of all, it is questionable to change the power state
of a PCI bridge with a device in D0 under it, but that is not
actively prevented from happening during system-wide PM transitions,
so use the skip_bus_pm flag introduced by commit d491f2b75237 for
that.

Second, the configuration of devices left in D0 (whatever the reason)
during suspend-to-idle need not be changed and attempting to put them
into D0 again by force may confuse some firmware, so explicitly avoid
doing that.

Fixes: d491f2b75237 ("PCI: PM: Avoid possible suspend-to-idle issue")
Reported-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

Tested on Dell XPS13 9360 with no issues.

---
 drivers/pci/pci-driver.c |   47 +++++++++++++++++++++++++++++++++++------------
 1 file changed, 35 insertions(+), 12 deletions(-)

Index: linux-pm/drivers/pci/pci-driver.c
===================================================================
--- linux-pm.orig/drivers/pci/pci-driver.c
+++ linux-pm/drivers/pci/pci-driver.c
@@ -524,7 +524,6 @@ static void pci_pm_default_resume_early(
 	pci_power_up(pci_dev);
 	pci_restore_state(pci_dev);
 	pci_pme_restore(pci_dev);
-	pci_fixup_device(pci_fixup_resume_early, pci_dev);
 }
 
 /*
@@ -842,18 +841,16 @@ static int pci_pm_suspend_noirq(struct d
 
 	if (pci_dev->skip_bus_pm) {
 		/*
-		 * The function is running for the second time in a row without
+		 * 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.  Moreover, the
-		 * device was originally left in D0, so its power state should
-		 * not be changed here and the device register values saved
-		 * originally should be restored on resume again.
+		 * 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.
 		 */
-		pci_dev->state_saved = true;
-	} else if (pci_dev->state_saved) {
-		if (pci_dev->current_state == PCI_D0)
-			pci_dev->skip_bus_pm = true;
-	} else {
+		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))
 			pci_prepare_to_sleep(pci_dev);
@@ -862,6 +859,22 @@ static int pci_pm_suspend_noirq(struct d
 	dev_dbg(dev, "PCI PM: Suspend power state: %s\n",
 		pci_power_name(pci_dev->current_state));
 
+	if (pci_dev->current_state == PCI_D0) {
+		pci_dev->skip_bus_pm = true;
+		/*
+		 * Changing the power state of a PCI bridge with a device in D0
+		 * below it is questionable, so avoid doing that by setting the
+		 * skip_bus_pm flag for the parent bridge.
+		 */
+		if (pci_dev->bus->self)
+			pci_dev->bus->self->skip_bus_pm = true;
+	}
+
+	if (pci_dev->skip_bus_pm && !pm_suspend_via_firmware()) {
+		dev_dbg(dev, "PCI PM: Skipped\n");
+		goto Fixup;
+	}
+
 	pci_pm_set_unknown_state(pci_dev);
 
 	/*
@@ -909,7 +922,16 @@ static int pci_pm_resume_noirq(struct de
 	if (dev_pm_smart_suspend_and_suspended(dev))
 		pm_runtime_set_active(dev);
 
-	pci_pm_default_resume_early(pci_dev);
+	/*
+	 * In the suspend-to-idle case, devices left in D0 during suspend will
+	 * stay in D0, so it is not necessary to restore or update their
+	 * configuration here and attempting to put them into D0 again may
+	 * confuse some firmware, so avoid doing that.
+	 */
+	if (!pci_dev->skip_bus_pm || pm_suspend_via_firmware())
+		pci_pm_default_resume_early(pci_dev);
+
+	pci_fixup_device(pci_fixup_resume_early, pci_dev);
 
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume_early(dev);
@@ -1200,6 +1222,7 @@ static int pci_pm_restore_noirq(struct d
 	}
 
 	pci_pm_default_resume_early(pci_dev);
+	pci_fixup_device(pci_fixup_resume_early, pci_dev);
 
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume_early(dev);




             reply	other threads:[~2019-06-13 17:12 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-12 22:14 Rafael J. Wysocki [this message]
2019-06-13  6:13 ` Kai-Heng Feng
2019-06-13 12:57 ` Mika Westerberg
2019-06-13 18:49 ` Rafael J. Wysocki
2019-06-13 21:38 ` Bjorn Helgaas
2019-06-13 21:46   ` Rafael J. Wysocki

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=2513600.jR9RdVMSR0@kreacher \
    --to=rjw@rjwysocki.net \
    --cc=helgaas@kernel.org \
    --cc=kai.heng.feng@canonical.com \
    --cc=kbusch@kernel.org \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=mika.westerberg@linux.intel.com \
    --subject='Re: [PATCH] PCI: PM: Skip devices in D0 for suspend-to-idle' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
on how to clone and mirror all data and code used for this inbox