linux-kernel - Re: [PATCH 0/2] usb: dwc3: core: Enable GUCTL1 bit 10 for fixing crc error after resume

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Date:   Wed, 20 Jul 2022 00:06:30 +0200
From:   Michael Grzeschik <mgr@...gutronix.de>
To:     Piyush Mehta <piyush.mehta@...inx.com>
Cc:     gregkh@...uxfoundation.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, balbi@...nel.org,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, michal.simek@...inx.com,
        git@...inx.com, sivadur@...inx.com
Subject: Re: [PATCH 0/2]  usb: dwc3: core: Enable GUCTL1 bit 10 for fixing
 crc error after resume

Hi Piyush!

On Mon, Jun 13, 2022 at 06:17:01PM +0530, Piyush Mehta wrote:
>This patch of the series does the following:
>- Add a new DT "snps,enable_guctl1_resume_quirk" quirk
>- Enable GUCTL1 bit 10 for fixing crc error after resume bug
>  When this bit is set to '1', the ULPI opmode will be changed
>  to 'normal' along with HS terminations after EOR.
>  This option is to support certain legacy ULPI PHYs.
>
>Piyush Mehta (2):
>  dt-bindings: usb: snps,dwc3: Add 'snps,enable_guctl1_resume_quirk'
>    quirk
>  usb: dwc3: core: Enable GUCTL1 bit 10 for fixing crc error after
>    resume bug
>
> .../devicetree/bindings/usb/snps,dwc3.yaml       |  6 ++++++
> drivers/usb/dwc3/core.c                          | 16 ++++++++++++++++
> drivers/usb/dwc3/core.h                          |  6 ++++++
> 3 files changed, 28 insertions(+)

I found your series and am wondering if you are planning to send a v2 of
it? It would really help to see this mainline.

The Xilinx Register Reference states BIT 10 as

RESUME_TERMSEL_XCVRSEL_UNIFY

which seems to be more meaningful than GUCTL1_RESUME_QUIRK. It would
probably make sense to work this in for v2.

The Documentation is also refering more than just opmode to be 0
during EOR. (termsel, xcvrsel, opmode).

https://www.xilinx.com/htmldocs/registers/ug1087/ug1087-zynq-ultrascale-registers.html#usb3_xhci___guctl1.html

Regards,
Michael

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