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USB: Adjust comment about stack drivers for clarity.

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This commit is contained in:
Augustin Cavalier 2021-09-04 13:11:02 -04:00
parent 4a70391472
commit 549e9a3cdc
1 changed files with 9 additions and 6 deletions
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15
src/add-ons/kernel/bus_managers/usb/Stack.cpp
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@ -50,18 +50,21 @@ Stack::Stack()
return;
}
// Check for host controller modules
// While using a fixed list of names is inflexible it allows us to control
// Check for host controller modules.
//
// While using a fixed list of names is inflexible, it allows us to control
// the order in which we try modules. There are controllers/BIOSes that
// require UHCI/OHCI to be initialized before EHCI or otherwise they
// refuse to publish any high-speed devices.
// On other systems the ordering is probably ensured because the EHCI
//
// On other systems, the ordering is probably ensured because the EHCI
// controller is required to have a higher PCI function number than the
// companion host controllers (per the EHCI specs) and it would therefore
// be enumerated as the last item. As this does not apply to us we have to
// be enumerated as the last item. As this does not apply to us, we have to
// ensure ordering using another method.
// Intel Lynx Point and Panther Point chipsets have ports shared between
// EHCI and XHCI, defaulting to EHCI. The XHCI module will switch USB 2.0
//
// Furthermore, on some systems, there can be ports shared between
// EHCI and XHCI, defaulting to EHCI. The XHCI module will switch these
// ports before the EHCI module discovers them.
const char *moduleNames[] = {
"busses/usb/xhci",