lp/drivers/usb: Add quirk for QEMU XHCI root hub

The QEMU XHCI driver does not implement the Port Change Detect bit
in the USBSTS register.  As a result no devices are attached without
looking at each port individually.

Detect this as a quirk based on the QEMU XHCI controller PCI ID,
and apply it to the root hub quirk list so it can get used by the
generic hub driver to skip this check.

With this change an attached USB mass storage device is detected and
able to boot when supplied to qemu:

  -drive if=none,id=usbmsc,format=raw,file=/tmp/disk.img
  -device qemu-xhci,id-xhci
  -device usb-storage,bus=xhci.0,drive=usbmsc

Change-Id: I6689cb1dbb24c93d45f5c5ef040b713925d07588
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39839
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

3 files changed, 32 insertions, 2 deletions

diff --git a/payloads/libpayload/drivers/usb/generic_hub.c b/payloads/libpayload/drivers/usb/generic_hub.c
index 9d444ee792..7263400840 100644
--- a/payloads/libpayload/drivers/usb/generic_hub.c
+++ b/payloads/libpayload/drivers/usb/generic_hub.c
@@ -218,9 +218,11 @@ generic_hub_poll(usbdev_t *const dev)
 	if (!hub)
 		return;
 
-	if (hub->ops->hub_status_changed &&
-			hub->ops->hub_status_changed(dev) != 1)
+	if (!(dev->quirks & USB_QUIRK_HUB_NO_USBSTS_PCD) &&
+	    hub->ops->hub_status_changed &&
+	    hub->ops->hub_status_changed(dev) != 1) {
 		return;
+	}
 
 	int port;
 	for (port = 1; port <= hub->num_ports; ++port) {
diff --git a/payloads/libpayload/drivers/usb/quirks.c b/payloads/libpayload/drivers/usb/quirks.c
index 0a3514933c..d5be0e6cda 100644
--- a/payloads/libpayload/drivers/usb/quirks.c
+++ b/payloads/libpayload/drivers/usb/quirks.c
@@ -59,6 +59,30 @@ usb_quirks_t usb_quirks[] = {
 	 */
 };
 
+#if CONFIG(LP_USB_PCI)
+usb_quirks_t pci_quirks[] = {
+	/* QEMU XHCI root hub does not implement port change detect */
+	{ 0x1b36, 0x000d, USB_QUIRK_HUB_NO_USBSTS_PCD, 0 },
+};
+
+u32 pci_quirk_check(pcidev_t controller)
+{
+	int i;
+	u16 vendor = pci_read_config16(controller, REG_VENDOR_ID);
+	u16 device = pci_read_config16(controller, REG_DEVICE_ID);
+
+	for (i = 0; i < ARRAY_SIZE(pci_quirks); i++) {
+		if ((pci_quirks[i].vendor == vendor) &&
+		    (pci_quirks[i].device == device)) {
+			printf("PCI quirks enabled: %08x\n", pci_quirks[i].quirks);
+			return pci_quirks[i].quirks;
+		}
+	}
+
+	return USB_QUIRK_NONE;
+}
+#endif
+
 u32 usb_quirk_check(u16 vendor, u16 device)
 {
 	int i;
diff --git a/payloads/libpayload/drivers/usb/xhci.c b/payloads/libpayload/drivers/usb/xhci.c
index ef1d73ff68..21af579f4c 100644
--- a/payloads/libpayload/drivers/usb/xhci.c
+++ b/payloads/libpayload/drivers/usb/xhci.c
@@ -314,9 +314,13 @@ xhci_pci_init (pcidev_t addr)
 
 	controller = xhci_init((unsigned long)reg_addr);
 	if (controller) {
+		xhci_t *xhci = controller->instance;
 		controller->pcidev = addr;
 
 		xhci_switch_ppt_ports(addr);
+
+		/* Set up any quirks for controller root hub */
+		xhci->roothub->quirks = pci_quirk_check(addr);
 	}
 
 	return controller;