diff options
Diffstat (limited to 'payloads/libpayload/drivers/usb')
| -rw-r--r-- | payloads/libpayload/drivers/usb/xhci.c | 15 |
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) { |