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From:   "Rafael J. Wysocki" <rjw@rjwysocki.net>
To:     Linux PCI <linux-pci@vger.kernel.org>
Cc:     Linux PM <linux-pm@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Bjorn Helgaas <helgaas@kernel.org>,
        Mika Westerberg <mika.westerberg@linux.intel.com>
Subject: [PATCH v1 5/7] PCI/PM: Move pci_set_low_power_state() next to its caller
Date:   Sat, 09 Apr 2022 15:23:49 +0200
Message-ID: <8948282.CDJkKcVGEf@kreacher>
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Because pci_set_power_state() is the only caller of
pci_set_low_power_state(), move the latter next to the former.

No functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/pci/pci.c |  174 +++++++++++++++++++++++++++---------------------------
 1 file changed, 87 insertions(+), 87 deletions(-)

Index: linux-pm/drivers/pci/pci.c
===================================================================
--- linux-pm.orig/drivers/pci/pci.c
+++ linux-pm/drivers/pci/pci.c
@@ -1068,93 +1068,6 @@ static inline bool platform_pci_bridge_d
 }
 
 /**
- * pci_set_low_power_state - Program the given device into a low-power state
- * @dev: PCI device to handle.
- * @state: PCI power state (D1, D2, D3hot) to put the device into.
- *
- * RETURN VALUE:
- * -EINVAL if the requested state is invalid.
- * -EIO if device does not support PCI PM or its PM capabilities register has a
- * wrong version, or device doesn't support the requested state.
- * 0 if device already is in the requested state.
- * 0 if device's power state has been successfully changed.
- */
-static int pci_set_low_power_state(struct pci_dev *dev, pci_power_t state)
-{
-	u16 pmcsr;
-
-	/* Check if we're already there */
-	if (dev->current_state == state)
-		return 0;
-
-	if (!dev->pm_cap)
-		return -EIO;
-
-	if (state < PCI_D1 || state > PCI_D3hot)
-		return -EINVAL;
-
-	/*
-	 * Validate transition: We can enter D0 from any state, but if
-	 * we're already in a low-power state, we can only go deeper.  E.g.,
-	 * we can go from D1 to D3, but we can't go directly from D3 to D1;
-	 * we'd have to go from D3 to D0, then to D1.
-	 */
-	if (dev->current_state <= PCI_D3cold && dev->current_state > state) {
-		pci_err(dev, "invalid power transition (from %s to %s)\n",
-			pci_power_name(dev->current_state),
-			pci_power_name(state));
-		return -EINVAL;
-	}
-
-	/* Check if this device supports the desired state */
-	if ((state == PCI_D1 && !dev->d1_support)
-	   || (state == PCI_D2 && !dev->d2_support))
-		return -EIO;
-
-	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
-	if (PCI_POSSIBLE_ERROR(pmcsr)) {
-		pci_err(dev, "can't change power state from %s to %s (config space inaccessible)\n",
-			pci_power_name(dev->current_state),
-			pci_power_name(state));
-		return -EIO;
-	}
-
-	/*
-	 * If we're (effectively) in D3, force entire word to 0.
-	 * This doesn't affect PME_Status, disables PME_En, and
-	 * sets PowerState to 0.
-	 */
-	if (dev->current_state <= PCI_D2) {
-		pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
-		pmcsr |= state;
-	}
-
-	/* Enter specified state */
-	pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
-
-	/*
-	 * Mandatory power management transition delays; see PCI PM 1.1
-	 * 5.6.1 table 18
-	 */
-	if (state == PCI_D3hot)
-		pci_dev_d3_sleep(dev);
-	else if (state == PCI_D2)
-		udelay(PCI_PM_D2_DELAY);
-
-	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
-	dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
-	if (dev->current_state != state)
-		pci_info_ratelimited(dev, "refused to change power state from %s to %s\n",
-			 pci_power_name(dev->current_state),
-			 pci_power_name(state));
-
-	if (dev->bus->self)
-		pcie_aspm_pm_state_change(dev->bus->self);
-
-	return 0;
-}
-
-/**
  * pci_update_current_state - Read power state of given device and cache it
  * @dev: PCI device to handle.
  * @state: State to cache in case the device doesn't have the PM capability
@@ -1391,6 +1304,93 @@ static int pci_set_full_power_state(stru
 
 	if (dev->bus->self)
 		pcie_aspm_pm_state_change(dev->bus->self);
+
+	return 0;
+}
+
+/**
+ * pci_set_low_power_state - Program the given device into a low-power state
+ * @dev: PCI device to handle.
+ * @state: PCI power state (D1, D2, D3hot) to put the device into.
+ *
+ * RETURN VALUE:
+ * -EINVAL if the requested state is invalid.
+ * -EIO if device does not support PCI PM or its PM capabilities register has a
+ * wrong version, or device doesn't support the requested state.
+ * 0 if device already is in the requested state.
+ * 0 if device's power state has been successfully changed.
+ */
+static int pci_set_low_power_state(struct pci_dev *dev, pci_power_t state)
+{
+	u16 pmcsr;
+
+	/* Check if we're already there */
+	if (dev->current_state == state)
+		return 0;
+
+	if (!dev->pm_cap)
+		return -EIO;
+
+	if (state < PCI_D1 || state > PCI_D3hot)
+		return -EINVAL;
+
+	/*
+	 * Validate transition: We can enter D0 from any state, but if
+	 * we're already in a low-power state, we can only go deeper.  E.g.,
+	 * we can go from D1 to D3, but we can't go directly from D3 to D1;
+	 * we'd have to go from D3 to D0, then to D1.
+	 */
+	if (dev->current_state <= PCI_D3cold && dev->current_state > state) {
+		pci_err(dev, "invalid power transition (from %s to %s)\n",
+			pci_power_name(dev->current_state),
+			pci_power_name(state));
+		return -EINVAL;
+	}
+
+	/* Check if this device supports the desired state */
+	if ((state == PCI_D1 && !dev->d1_support)
+	   || (state == PCI_D2 && !dev->d2_support))
+		return -EIO;
+
+	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
+	if (PCI_POSSIBLE_ERROR(pmcsr)) {
+		pci_err(dev, "can't change power state from %s to %s (config space inaccessible)\n",
+			pci_power_name(dev->current_state),
+			pci_power_name(state));
+		return -EIO;
+	}
+
+	/*
+	 * If we're (effectively) in D3, force entire word to 0.
+	 * This doesn't affect PME_Status, disables PME_En, and
+	 * sets PowerState to 0.
+	 */
+	if (dev->current_state <= PCI_D2) {
+		pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
+		pmcsr |= state;
+	}
+
+	/* Enter specified state */
+	pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
+
+	/*
+	 * Mandatory power management transition delays; see PCI PM 1.1
+	 * 5.6.1 table 18
+	 */
+	if (state == PCI_D3hot)
+		pci_dev_d3_sleep(dev);
+	else if (state == PCI_D2)
+		udelay(PCI_PM_D2_DELAY);
+
+	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
+	dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
+	if (dev->current_state != state)
+		pci_info_ratelimited(dev, "refused to change power state from %s to %s\n",
+			 pci_power_name(dev->current_state),
+			 pci_power_name(state));
+
+	if (dev->bus->self)
+		pcie_aspm_pm_state_change(dev->bus->self);
 
 	return 0;
 }