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-rw-r--r--payloads/libpayload/drivers/usb/xhci.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/usb/xhci.c b/payloads/libpayload/drivers/usb/xhci.c
index c29d323175..51f9422ceb 100644
--- a/payloads/libpayload/drivers/usb/xhci.c
+++ b/payloads/libpayload/drivers/usb/xhci.c
@@ -110,6 +110,19 @@ xhci_switch_ppt_ports(pcidev_t addr)
}
}
+/* On Panther Point: switch all ports back to EHCI */
+static void
+xhci_switchback_ppt_ports(pcidev_t addr)
+{
+ if (pci_read_config32(addr, 0x00) == 0x1e318086) {
+ u32 reg32 = pci_read_config32(addr, 0xd0) & 0xf;
+ xhci_debug("Switching ports back: 0x%"PRIx32"\n", reg32);
+ pci_write_config32(addr, 0xd0, 0x00000000);
+ reg32 = pci_read_config32(addr, 0xd0) & 0xf;
+ xhci_debug("Still switched to xHCI: 0x%"PRIx32"\n", reg32);
+ }
+}
+
static long
xhci_handshake(volatile u32 *const reg, u32 mask, u32 wait_for, long timeout_us)
{
@@ -389,6 +402,8 @@ xhci_shutdown(hci_t *const controller)
xhci_stop(controller);
+ xhci_switchback_ppt_ports(controller->bus_address);
+
if (xhci->sp_ptrs) {
const size_t max_sp_bufs = xhci->capreg->Max_Scratchpad_Bufs;
for (i = 0; i < max_sp_bufs; ++i) {