openwrt/target/linux/generic/pending-4.19/811-pci_disable_usb_common_quirks.patch

From: Felix Fietkau <nbd@nbd.name>
Subject: debloat: disable common USB quirks

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 drivers/usb/host/pci-quirks.c | 16 ++++++++++++++++
 drivers/usb/host/pci-quirks.h | 18 +++++++++++++++++-
 include/linux/usb/hcd.h       |  7 +++++++
 3 files changed, 40 insertions(+), 1 deletion(-)

--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -125,6 +125,8 @@ struct amd_chipset_type {
 	u8 rev;
 };
 
+#ifndef CONFIG_PCI_DISABLE_COMMON_QUIRKS
+
 static struct amd_chipset_info {
 	struct pci_dev	*nb_dev;
 	struct pci_dev	*smbus_dev;
@@ -628,6 +630,10 @@ bool usb_amd_pt_check_port(struct device
 }
 EXPORT_SYMBOL_GPL(usb_amd_pt_check_port);
 
+#endif /* CONFIG_PCI_DISABLE_COMMON_QUIRKS */
+
+#if IS_ENABLED(CONFIG_USB_UHCI_HCD)
+
 /*
  * Make sure the controller is completely inactive, unable to
  * generate interrupts or do DMA.
@@ -707,8 +713,17 @@ reset_needed:
 	uhci_reset_hc(pdev, base);
 	return 1;
 }
+#else
+int uhci_check_and_reset_hc(struct pci_dev *pdev, unsigned long base)
+{
+	return 0;
+}
+
+#endif
 EXPORT_SYMBOL_GPL(uhci_check_and_reset_hc);
 
+#ifndef CONFIG_PCI_DISABLE_COMMON_QUIRKS
+
 static inline int io_type_enabled(struct pci_dev *pdev, unsigned int mask)
 {
 	u16 cmd;
@@ -1275,3 +1290,4 @@ static void quirk_usb_early_handoff(stru
 }
 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
 			PCI_CLASS_SERIAL_USB, 8, quirk_usb_early_handoff);
+#endif
--- a/drivers/usb/host/pci-quirks.h
+++ b/drivers/usb/host/pci-quirks.h
@@ -5,6 +5,9 @@
 #ifdef CONFIG_USB_PCI
 void uhci_reset_hc(struct pci_dev *pdev, unsigned long base);
 int uhci_check_and_reset_hc(struct pci_dev *pdev, unsigned long base);
+#endif  /* CONFIG_USB_PCI */
+
+#if defined(CONFIG_USB_PCI) && !defined(CONFIG_PCI_DISABLE_COMMON_QUIRKS)
 int usb_amd_find_chipset_info(void);
 int usb_hcd_amd_remote_wakeup_quirk(struct pci_dev *pdev);
 bool usb_amd_hang_symptom_quirk(void);
@@ -19,6 +22,18 @@ void sb800_prefetch(struct device *dev,
 bool usb_amd_pt_check_port(struct device *device, int port);
 #else
 struct pci_dev;
+static inline int usb_amd_find_chipset_info(void)
+{
+	return 0;
+}
+static inline bool usb_amd_hang_symptom_quirk(void)
+{
+	return false;
+}
+static inline bool usb_amd_prefetch_quirk(void)
+{
+	return false;
+}
 static inline void usb_amd_quirk_pll_disable(void) {}
 static inline void usb_amd_quirk_pll_enable(void) {}
 static inline void usb_asmedia_modifyflowcontrol(struct pci_dev *pdev) {}
@@ -29,6 +44,11 @@ static inline bool usb_amd_pt_check_port
 {
 	return false;
 }
+static inline void usb_enable_intel_xhci_ports(struct pci_dev *xhci_pdev) {}
+static inline bool usb_xhci_needs_pci_reset(struct pci_dev *pdev)
+{
+	return false;
+}
 #endif  /* CONFIG_USB_PCI */
 
 #endif  /*  __LINUX_USB_PCI_QUIRKS_H  */
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -473,7 +473,14 @@ extern int usb_hcd_pci_probe(struct pci_
 extern void usb_hcd_pci_remove(struct pci_dev *dev);
 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
 
+#ifndef CONFIG_PCI_DISABLE_COMMON_QUIRKS
 extern int usb_hcd_amd_remote_wakeup_quirk(struct pci_dev *dev);
+#else
+static inline int usb_hcd_amd_remote_wakeup_quirk(struct pci_dev *dev)
+{
+	return 0;
+}
+#endif
 
 #ifdef CONFIG_PM
 extern const struct dev_pm_ops usb_hcd_pci_pm_ops;