linux-kernel - Re: [PATCH v10 1/5] usb: xhci: Change the XHCI link order in the Makefile

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Date:   Wed, 13 May 2020 14:26:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Al Cooper <alcooperx@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Alan Stern <stern@...land.harvard.edu>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-usb@...r.kernel.org, Mathias Nyman <mathias.nyman@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v10 1/5] usb: xhci: Change the XHCI link order in the
 Makefile

On Tue, May 12, 2020 at 11:00:15AM -0400, Al Cooper wrote:
> Some BRCMSTB USB chips have an XHCI, EHCI and OHCI controller
> on the same port where XHCI handles 3.0 devices, EHCI handles 2.0
> devices and OHCI handles <2.0 devices. Currently the Makefile
> has XHCI linking at the bottom which will result in the XHIC driver
> initalizing after the EHCI and OHCI drivers and any installed 3.0
> device will be seen as a 2.0 device. Moving the XHCI linking
> above the EHCI and OHCI linking fixes the issue.

What happens if all of these are modules and they are loaded in a
different order?  This makefile change will not help with that, you need
to have logic in the code in order to properly coordinate this type of
mess, sorry.

thanks,

greg k-h