linux-kernel - [PATCH 2/5] PCI: PM: Use pci_power_up() in pci_set_power

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Message-ID: <2520019.OZ1nXS5aSj@kreacher>
Date:   Tue, 05 Nov 2019 11:27:49 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 2/5] PCI: PM: Use pci_power_up() in pci_set_power_state()

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

Make it explicitly clear that the code to put devices into D0 in
pci_set_power_state() and in pci_pm_default_resume_early() is the
same by making the latter use pci_power_up() for transitions into
D0.

Code rearrangement, no intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

This is on top of https://patchwork.kernel.org/patch/11223673/

---
 drivers/pci/pci.c |   25 +++++++++++++------------
 drivers/pci/pci.h |    2 +-
 2 files changed, 14 insertions(+), 13 deletions(-)

Index: linux-pm/drivers/pci/pci.c
===================================================================
--- linux-pm.orig/drivers/pci/pci.c
+++ linux-pm/drivers/pci/pci.c
@@ -1033,6 +1033,16 @@ static void __pci_start_power_transition
 }
 
 /**
+ * pci_power_up - Put the given device into D0
+ * @dev: PCI device to power up
+ */
+int pci_power_up(struct pci_dev *dev)
+{
+	__pci_start_power_transition(dev, PCI_D0);
+	return pci_raw_set_power_state(dev, PCI_D0);
+}
+
+/**
  * __pci_dev_set_current_state - Set current state of a PCI device
  * @dev: Device to handle
  * @data: pointer to state to be set
@@ -1117,6 +1127,9 @@ int pci_set_power_state(struct pci_dev *
 	if (dev->current_state == state)
 		return 0;
 
+	if (state == PCI_D0)
+		return pci_power_up(dev);
+
 	/*
 	 * This device is quirked not to be put into D3, so don't put it in
 	 * D3
@@ -1124,8 +1137,6 @@ int pci_set_power_state(struct pci_dev *
 	if (state >= PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3))
 		return 0;
 
-	__pci_start_power_transition(dev, state);
-
 	/*
 	 * To put device in D3cold, we put device into D3hot in native
 	 * way, then put device into D3cold with platform ops
@@ -1141,16 +1152,6 @@ int pci_set_power_state(struct pci_dev *
 EXPORT_SYMBOL(pci_set_power_state);
 
 /**
- * pci_power_up - Put the given device into D0 forcibly
- * @dev: PCI device to power up
- */
-void pci_power_up(struct pci_dev *dev)
-{
-	__pci_start_power_transition(dev, PCI_D0);
-	pci_raw_set_power_state(dev, PCI_D0);
-}
-
-/**
  * pci_choose_state - Choose the power state of a PCI device
  * @dev: PCI device to be suspended
  * @state: target sleep state for the whole system. This is the value
Index: linux-pm/drivers/pci/pci.h
===================================================================
--- linux-pm.orig/drivers/pci/pci.h
+++ linux-pm/drivers/pci/pci.h
@@ -85,7 +85,7 @@ struct pci_platform_pm_ops {
 int pci_set_platform_pm(const struct pci_platform_pm_ops *ops);
 void pci_update_current_state(struct pci_dev *dev, pci_power_t state);
 void pci_refresh_power_state(struct pci_dev *dev);
-void pci_power_up(struct pci_dev *dev);
+int pci_power_up(struct pci_dev *dev);
 void pci_disable_enabled_device(struct pci_dev *dev);
 int pci_finish_runtime_suspend(struct pci_dev *dev);
 void pcie_clear_root_pme_status(struct pci_dev *dev);