Hi Michael, On Tue, Oct 4, 2016 at 4:28 PM, Michael Niewöhner <linux@xxxxxxxxxxxxxx> wrote: > > > > > > [1.] One line summary of the problem: > > > > > > DWC3 USB 3.0 not working on Odroid-XU4 with Exynos 5422 > > > > > > > > > > > > [2.] Full description of the problem/report: > > > > > > No usb 3.0 devices are being detected when attached while USB 2.0 > > > > > > devices work on the same port. > > > > > > USB 3.0 works after applying patches [9.1] and [9.2], but seems > > > > > > to be > > > > > > buggy. The usb hub is redetected every time an usb device is > > > > > > attached. [snip] >> > > > > > [9.] Other notes, patches, fixes, workarounds: >> > > > > > [9.1] https://lkml.org/lkml/2014/4/28/234 >> > > > > > [9.2] https://lkml.org/lkml/2015/2/2/259 >> >> These patches are required to get USB super-speed working on Exynos5420/5800. >> But they did not make to upstream. There was resistance on adding new >> phy_calibrate() >> callback. >> >> Without these patches the Exynos5420/5800 will enumerate all >> super-speed capable devices >> as high-speed devices. >> Last time we checked with exynos542x smdk boards and peach-* boards, >> we could get the >> Super - speed devices working. I have not tested odroid anytime so >> don't have much idea about the >> its intricacies. >> I guess Anand was able to use these patches to get his kernel working in past. > > > The patches don't work anymore with 4.8-rc* / 4.8. They worked - but very > unstable - with 4.7. > > One more problem appeared since one of the 4.8-RCs: reboot hangs when the dwc3 > module is loaded. If I unload it before reboot / shutdown everything is fine. > > >> >> When you have a downstream on-board usb hub, ideally it should be able >> to detect the devices >> and not reset everytime you connect a new device (like you mentioned earlier). >> There can be two possible reasons why the hub keeps getting reset ever >> after applying the above >> mentioned patches: >> 1) the clock rates are not proper. >> 2) the regulator load setting is not enough to drive the hub. >> >> Anand, can you please point Michael to an older kernel with which you >> could test usb on odroid successfully ? >> You can compare the clocks with an older version and see if there'a >> any difference. >> >> Any possibility of any other framework (such as, bus-freq) trimming >> down the clock - rates ? > > > ################################ > # v4.7.5 > ################################ > > $ cat /sys/kernel/debug/clk/clk_summary | grep usb > sclk_usbh20_scan_clk 0 0 480000000 0 > sclk_usbh20 0 0 48000 > 000 0 > mout_usbd300 1 1 24000000 0 > dout_usbd300 0 0 24000000 0 > sclk_usbd300 > 0 0 24000000 0 > dout_usbphy300 1 1 24000000 0 > sclk_usbphy300 4 4 24000 > 000 0 > mout_usbd301 1 1 24000000 0 > dout_usbd301 0 0 24000000 0 > sclk_usbd301 > 0 0 24000000 0 > dout_usbphy301 1 1 24000000 0 > sclk_usbphy301 3 3 24000 > 000 0 > usbd301 1 1 100000000 > usbd300 1 1 100000000 > > usbh20 3 3 100000000 0 > > ################################ > # v4.8.0 > ################################ > > $ cat /sys/kernel/debug/clk/clk_summary | grep usb > sclk_usbh20_scan_clk 0 0 480000000 0 > sclk_usbh20 0 0 48000000 > 0 > mout_usbd300 1 1 24000000 0 > dout_usbd300 0 0 24000000 0 > sclk_usbd300 > 0 0 24000000 0 > dout_usbphy300 1 1 24000000 0 > sclk_usbphy300 4 4 24000000 > 0 > mout_usbd301 1 1 24000000 0 > dout_usbd301 0 0 24000000 0 > sclk_usbd301 > 0 0 24000000 0 > dout_usbphy301 1 1 24000000 0 > sclk_usbphy301 3 3 24000000 > 0 > usbd301 1 1 100000000 This clock should have been 200MHz. > usbd300 1 1 100000000 > usbh2 > 0 3 3 100000000 0 > > $ cat /sys/kernel/debug/usb/devices > <<system hangs>> > The clocks are same across working/non-working. Is it possible to bisect the commit that's causing hang for 4.8x ? Adding few of the folks from Samsung who can test dwc3 usb on smdk/peach boards. +Alim, Pankaj Hi Alim, Pankaj, can you please give a try with 4.8 kernel on peach/smdk542x board and see if dwc3 usb works or not. You may need to the patches mentioned in [9.1] and [9.2] mentioned above. [snip] Thanks Vivek -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
