linux-kernel - Re: [PATCH 1/2] dt-bindings: usb: snps,dwc3: Add 'snps,enable_guctl1_resume

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Date:   Thu, 16 Jun 2022 15:42:51 -0700
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Piyush Mehta <piyush.mehta@...inx.com>, 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
Cc:     git@...inx.com, sivadur@...inx.com
Subject: Re: [PATCH 1/2] dt-bindings: usb: snps,dwc3: Add
 'snps,enable_guctl1_resume_quirk' quirk

On 13/06/2022 05:47, Piyush Mehta wrote:
> Add a new DT quirk to dwc3 core to resolved issue of CRC failed error.
> On the resume path, U3/U2 exit controller fails to send proper CRC
> checksum in CRC5 field. As result Transaction Error is generated.
> Enabling bit 10 of GUCTL1 will correct this problem.
> 
> When this bit is set to '1', the UTMI/ULPI opmode will be changed to
> "normal" along with HS terminations after EOR.
> This option is to support certain legacy UTMI/ULPI PHYs.
> 
> Signed-off-by: Piyush Mehta <piyush.mehta@...inx.com>
> ---
>  Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> index d41265ba8ce2..36fa87df57a9 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -234,6 +234,12 @@ properties:
>        avoid -EPROTO errors with usbhid on some devices (Hikey 970).
>      type: boolean
>  
> +  snps,enable_guctl1_resume_quirk:

No underscores in properties, use hyphens.

> +    description:
> +      Set if we enable quirk for fixing improper crc generation after resume
> +      from suspend.

Please describe actual issue, hardware property, not driver behavior. In
the description and property name. This could be something like
"snps,missing-src-after-resume" (or anything better).

Best regards,
Krzysztof