DWC3 host support

Michal Simek michal.simek at amd.com
Mon Jul 18 10:13:20 CEST 2022

On 7/17/22 17:23, Marek Vasut wrote:
> On 7/17/22 05:00, Angus Ainslie wrote:
>> On 2022-07-16 11:37, Marek Vasut wrote:
>>> On 7/16/22 15:02, Angus Ainslie wrote:
>>>> Hi Michal,
>>>> I recently rebased my librem5 tree onto the latest u-boot-imx branch
>>>> and the dwc3 host mode stopped working.
>>>> I bisected it down to this commit:
>>>> 142d50fbce7c364a74f5e8204dba491b9f066e6c usb: dwc3: Add support for
>>>> usb3-phy PHY configuration
>>>> Reverting that commit allows usb host mode to work on the librem5 again.
>>>> Should this initialization go into an SOC specific glue_configure
>>>> function ?
>>>> Is the imx8mq.dtsi missing something that will keep usb host working
>>>> with this patch ?
>>>> Does this break usb host on other imx8mq devices ?
>>> Wasn't this fixed by:
>>> 868d58f69c ("usb: dwc3: Fix non-usb3 configurations")
>>> ?
>> I've got that in my tree and it still fails to probe the USB2 hub and
>> USB 2 storage.
> I assume you do have CONFIG_PHY_IMX8MQ_USB enabled ?
> What does generic_phy_get_by_name() return for you in
> drivers/usb/dwc3/dwc3-generic.c ?

As Marek said there was one patch which fixes origin patch which didn't handle 
all the error cases properly. We need to know return value from 
generic_phy_get_by_name(), also if you still have usb3-phy in DT (as is in 
imx8mq.dtsi) with phy DT status enabled and enabled  phy driver 


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