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    SubjectRe: [PATCH] ARM: dts: Odroid XU4: fix USB3.0 ports
    On Thu, Feb 09, 2017 at 11:26:48AM +0100, Richard Genoud wrote:
    > I did some tests with XU3 and XU4, playing with USB2 and USB3 quirks
    > (snps,dis_u{2,3}_susphy_quirk)
    >
    > kernel for the tests: next-20170206
    > DTBs: exynos5422-odroidxu3-lite.dtb exynos5422-odroidxu4.dtb
    >
    > USB devices used for the tests: kingston USB3 key, Akasa sata/USB3
    > +SSD standard USB2 key
    > once recognized, a dd if=/dev/sda bs=1M count=100 of=/dev/null is done.
    >
    >
    > The results are:
    > - On XU4:
    > - adding snps,dis_u2_susphy_quirk doesn't change anything:
    > inserting an USB2 or USB3 device gives the error message:
    > xhci-hcd xhci-hcd.2.auto: Port resume took longer than 20000 msec,
    > port status = 0xc400fe3
    > - with snps,dis_u3_susphy_quirk, USB2 and USB3 devices are recognized
    >
    > - On XU3:
    > - Without changing XU3 dts, USB2 devices are recognized.
    > - With or without the snps,dis_u3_susphy_quirk, USB3 devices are not
    > recognized/not working properly
    > (never seen or disconnected, unable to enumerate, etc.)
    > However, adding an external powered USB3 hub in between works. (with
    > or without the snps,dis_u3_susphy_quirk)
    > Anyway, this problem doesn't seems to be related to the other since
    > addind the quirks doesn't change anything.

    From this description I am missing where are you inserting the USB
    devices.

    Both boards have totally different USB port configuration. On XU3 the
    hub is on USB 2.0 port. On XU4 the opposite - the hub is on USB 3.0
    port.

    Best regards,
    Krzysztof

    > - On XU3 USB3 device port (dr_mode = "peripheral"):
    > - acting as an ethernet gadget only works with the snps,dis_u3_susphy_quirk.
    > It works well as USB2 or USB3 (tested with ethernet gadget+iperf)
    >
    > So, at the end, it does seem usefull to add the
    > snps,dis_u3_susphy_quirk at the exynos5420.dtsi level.
    > Adding the snps,dis_u2_susphy_quirk doesn't seems to change anything
    > for XU3/XU4 board,
    > so I don't know if it is necessary or not.

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