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YPenguin
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PostPosted: Tue Feb 05, 2019 7:15 pm    Post subject: NEC / Renesas µPD720201 Reply with quote

There is a problem with certain NEC / Renesas USB 3 host controller chips at boot time.

It has also been discussed at Arch-Linux: https://bbs.archlinux.org/viewtopic.php?id=236806
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YPenguin
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PostPosted: Tue Feb 05, 2019 7:19 pm    Post subject: xhci.c Reply with quote

Kernel comments in the current Kernel 5.0 rc4 regarding Renesas (xhci.c):
Code:

        /*
         * Some Renesas controllers get into a weird state if they are
         * reset while programmed with 64bit addresses (they will preserve
         * the top half of the address in internal, non visible
         * registers). You end up with half the address coming from the
         * kernel, and the other half coming from the firmware. Also,
         * changing the programming leads to extra accesses even if the
         * controller is supposed to be halted. The controller ends up with
         * a fatal fault, and is then ripe for being properly reset.
         *
         * Special care is taken to only apply this if the device is behind
         * an iommu. Doing anything when there is no iommu is definitely
         * unsafe...
         */
 

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YPenguin
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PostPosted: Tue Feb 05, 2019 7:26 pm    Post subject: Quirks Reply with quote

I have one such chip and see no quirks mentioned in the dmesg protocol of the boot process. Are xhci-pci-quirks deactivated during boot?
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YPenguin
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PostPosted: Fri Feb 15, 2019 10:55 am    Post subject: Kernel 4.1 Reply with quote

I'm currently using gentoo-sources 4.1.43-r1 which works flawlessly with the Renesas chip.
The problem appeared with kernel 4.9 but currently affects even 4.4 - probably as a result of patching.
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