linux-kernel - Re: [PATCH v2 1/2] dt-bindings: usb: snps,dwc3: Add snps,filter-se0-fsls-eop quirk

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Message-ID: <1129e0a7-6bd0-416e-8c56-6b8d75600c4e@quicinc.com>
Date: Thu, 7 Nov 2024 11:47:11 +0530
From: Krishna Kurapati <quic_kriskura@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
        Uttkarsh Aggarwal
	<quic_uaggarwa@...cinc.com>
CC: Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Thinh Nguyen
	<Thinh.Nguyen@...opsys.com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <quic_ppratap@...cinc.com>, <quic_jackp@...cinc.com>
Subject: Re: [PATCH v2 1/2] dt-bindings: usb: snps,dwc3: Add
 snps,filter-se0-fsls-eop quirk



On 10/18/2024 11:57 AM, Krzysztof Kozlowski wrote:
> On Thu, Oct 17, 2024 at 05:10:54PM +0530, Uttkarsh Aggarwal wrote:
>> Adding a new 'snps,filter-se0-fsls-eop quirk' DT quirk to dwc3 core to set
>> GUCTL1 BIT 29. When set, controller will ignore single SE0 glitch on the
>> linestate during transmission. Only two or more SE0 is considered as
>> valid EOP on FS/LS port. This bit is applicable only in FS in device mode
>> and FS/LS mode of operation in host mode.
> 
> Why this is not device/compatible specific? Just like all other quirks
> pushed last one year.

Hi Krzysztof,

  Apologies for a late reply from our end.

  In DWC3 core/dwc3-qcom atleast, there have been no compatible specific 
quirks added. Also since this is a property of the Synopsys controller 
hardware and not QC specific one, can we add it in bindings itself. 
Because this is a property other vendors might also use and adding it 
via compatible might not be appropriate.

  Let us know your thoughts on this.

Regards,
Krishna,

> 
>>
>> Signed-off-by: Uttkarsh Aggarwal <quic_uaggarwa@...cinc.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 1cd0ca90127d..d9e813bbcd80 100644
>> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
>> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
>> @@ -180,6 +180,12 @@ properties:
>>       description: When set core will set Tx de-emphasis value
>>       type: boolean
>>   
>> +  snps,filter-se0-fsls-eop-quirk:
>> +    description:
>> +      When set controller will ignore single SE0 glitch on the linestate during transmit
> 
> Does not look like wrapped according to coding style (checkpatch is not
> a coding style document).
> 
> Best regards,
> Krzysztof
> 
>