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Date:   Wed, 27 Sep 2023 14:05:03 +0200
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Subject: Re: [RESEND PATCH v6 17/17] media: qcom: camss: Comment CSID dt_id
 field
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To:     Bryan O'Donoghue <bryan.odonoghue@linaro.org>,
        linux-arm-msm@vger.kernel.org, linux-media@vger.kernel.org,
        laurent.pinchart@ideasonboard.com, rfoss@kernel.org,
        todor.too@gmail.com, agross@kernel.org, andersson@kernel.org,
        konrad.dybcio@linaro.org, mchehab@kernel.org,
        sakari.ailus@linux.intel.com, andrey.konovalov@linaro.org
Cc:     linux-kernel@vger.kernel.org
References: <20230925154707.837542-1-bryan.odonoghue@linaro.org>
 <20230925154707.837542-18-bryan.odonoghue@linaro.org>
 <cf7cdafb-ccd1-42ee-9c67-5e6600f752f7@xs4all.nl>
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From:   Hans Verkuil <hverkuil@xs4all.nl>
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On 27/09/2023 14:03, Bryan O'Donoghue wrote:
> On 27/09/2023 12:42, Hans Verkuil wrote:
>>> +        /*
>>> +         * DT_ID is a two bit bitfield that is concatenated with
>>> +         * the four least significant bits of the six bit VC
>>> +         * bitfield to generate an internal CID value.
>>> +         *
>>> +         * CSID_RDI_CFG0(vc)
>>> +         * DT_ID : 28:27
>>> +         * VC    : 26:22
>> This is 5 bits, not 6 bits as the comment above says. Which is right?
> 
> Yes you're right I had "DT" which is six bits in my head when I wrote this. The VC bitfield is five.
> 
>>
>>> +         * DT    : 21:16
>>> +         *
>>> +         * CID   : VC 3:0 << 2 | DT_ID 1:0
>>> +         */
>>>           u8 dt_id = vc;
>> So if dt_id is 2 bits, and vc can be more than 2 bits in the future,
>> shouldn't this read "vc & 3"?
> 
> Hmm...
> 
> val |= dt_id << RDI_CFG0_DT_ID;
> 
> yes that would overrun otherwise.

No need to repost the whole series, just post a v6.1 for this patch only.

Regards,

	Hans