[PATCH v8 2/7] PCI: Introduce shpchp_is_native()

[Mika Westerberg <mika.westerberg@linux.intel.com>]

In the same way we do for pciehp, introduce a new function
shpchp_is_native() that returns true whether the bridge should be
handled by the native SHCP driver. Then convert the driver to use this
function.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
 drivers/pci/hotplug/acpi_pcihp.c  |  4 ++--
 drivers/pci/hotplug/shpchp_core.c |  2 --
 drivers/pci/pci-acpi.c            | 21 +++++++++++++++++++++
 include/linux/pci_hotplug.h       |  2 ++
 4 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/hotplug/acpi_pcihp.c b/drivers/pci/hotplug/acpi_pcihp.c
index 597d22aeefc1..3979f89b250a 100644
--- a/drivers/pci/hotplug/acpi_pcihp.c
+++ b/drivers/pci/hotplug/acpi_pcihp.c
@@ -83,11 +83,11 @@ int acpi_get_hp_hw_control_from_firmware(struct pci_dev *pdev)
 	 * OSHP within the scope of the hotplug controller and its parents,
 	 * up to the host bridge under which this controller exists.
 	 */
-	host = pci_find_host_bridge(pdev->bus);
-	if (host->native_shpc_hotplug)
+	if (shpchp_is_native(pdev))
 		return 0;
 
 	/* If _OSC exists, we should not evaluate OSHP */
+	host = pci_find_host_bridge(pdev->bus);
 	root = acpi_pci_find_root(ACPI_HANDLE(&host->dev));
 	if (root->osc_support_set)
 		goto no_control;
diff --git a/drivers/pci/hotplug/shpchp_core.c b/drivers/pci/hotplug/shpchp_core.c
index 47decc9b3bb3..0f3711404c2b 100644
--- a/drivers/pci/hotplug/shpchp_core.c
+++ b/drivers/pci/hotplug/shpchp_core.c
@@ -275,8 +275,6 @@ static int is_shpc_capable(struct pci_dev *dev)
 	if (dev->vendor == PCI_VENDOR_ID_AMD &&
 	    dev->device == PCI_DEVICE_ID_AMD_GOLAM_7450)
 		return 1;
-	if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
-		return 0;
 	if (acpi_get_hp_hw_control_from_firmware(dev))
 		return 0;
 	return 1;
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 52b8434d4d6e..bb83be0d0e5b 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -394,6 +394,27 @@ bool pciehp_is_native(struct pci_dev *bridge)
 	return host->native_pcie_hotplug;
 }
 
+/**
+ * shpchp_is_native - Check whether a hotplug port is handled by the OS
+ * @bridge: Hotplug port to check
+ *
+ * Returns true if the given @bridge is handled by the native SHPC hotplug
+ * driver.
+ */
+bool shpchp_is_native(struct pci_dev *bridge)
+{
+	const struct pci_host_bridge *host;
+
+	if (!IS_ENABLED(CONFIG_HOTPLUG_PCI_SHPC))
+		return false;
+
+	if (!pci_find_capability(bridge, PCI_CAP_ID_SHPC))
+		return false;
+
+	host = pci_find_host_bridge(bridge->bus);
+	return host->native_shpc_hotplug;
+}
+
 /**
  * pci_acpi_wake_bus - Root bus wakeup notification fork function.
  * @context: Device wakeup context.
diff --git a/include/linux/pci_hotplug.h b/include/linux/pci_hotplug.h
index 1f5c935eb0de..4c378368215c 100644
--- a/include/linux/pci_hotplug.h
+++ b/include/linux/pci_hotplug.h
@@ -164,6 +164,7 @@ struct hotplug_params {
 int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp);
 bool pciehp_is_native(struct pci_dev *bridge);
 int acpi_get_hp_hw_control_from_firmware(struct pci_dev *bridge);
+bool shpchp_is_native(struct pci_dev *bridge);
 int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle);
 int acpi_pci_detect_ejectable(acpi_handle handle);
 #else
@@ -178,5 +179,6 @@ static inline int acpi_get_hp_hw_control_from_firmware(struct pci_dev *bridge)
 	return 0;
 }
 static inline bool pciehp_is_native(struct pci_dev *bridge) { return true; }
+static inline bool shpchp_is_native(struct pci_dev *bridge) { return true; }
 #endif
 #endif
-- 
2.17.0