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--- Begin Message ---
Hi,

On Wed, Apr 22, 2020 at 1:21 AM Alexey Dobrovolskiy
<dobrovolskiy.ale...@gmail.com> wrote:
>
> Hi,
> USB does not work in master at 35f208da3c built with testing kernel
> 5.4 with or without 0032-USB-dwc2-add-device_reset.patch.
> (ramips, ZyXEL Keenetic)
> In boot log:
> [    6.888293] usbcore: registered new interface driver usbfs
> [    6.899641] usbcore: registered new interface driver hub
> [    6.910630] usbcore: registered new device driver usb
> [    6.930904] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
> [    6.955086] SCSI subsystem initialized
> [    6.970394] ehci-fsl: Freescale EHCI Host controller driver
> [    6.985235] ehci-platform: EHCI generic platform driver
> [    7.006666] dwc2 101c0000.otg: Configuration mismatch. dr_mode forced to 
> host
> [    7.033189] dwc2 101c0000.otg: dwc2_core_reset: HANG! AHB Idle
> timeout GRSTCTL GRSTCTL_AHBIDLE
> [    7.050637] dwc2: probe of 101c0000.otg failed with error -16
> [    7.074662] usbcore: registered new interface driver usb-storage
>
> Full log attached to FS#2964
We had a similar issue on the Lantiq SoCs a while ago.
Based on these issues we submitted the following patches upstream:
- [0] usb: dwc2: use a longer AHB idle timeout in dwc2_core_reset()
- [1] usb: dwc2: use a longer core rest timeout in dwc2_core_reset()

while looking at target/linux/ramips/dts/rt3050.dts I observed that it uses:
  reset-names = "otg";
while the dwc2 driver actually [2] expects:
  reset-names = "dwc2";

quick disclaimer: I don't own any ramips based hardware, so I don't
expect that I'll be able to look further into this issue.


Regards
Martin


[0] 
https://github.com/torvalds/linux/commit/dfc4fdebc5d62ac4e2fe5428e59b273675515fb2
[1] 
https://github.com/torvalds/linux/commit/6689f0f4bb14e50917ba42eb9b41c25e0184970c
[2] 
https://elixir.bootlin.com/linux/v5.4.34/source/drivers/usb/dwc2/platform.c#L215


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