linux-kernel - Re: [PATCH v3 3/6] media: qcom: camss: csiphy-3ph: Add Gen2 v1.1 two-phase MIPI CSI-2 DPHY init

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Date:   Wed, 8 Nov 2023 00:36:01 +0000
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>, hverkuil-cisco@...all.nl,
        laurent.pinchart@...asonboard.com, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Robert Foss <rfoss@...nel.org>,
        Todor Tomov <todor.too@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, vincent.knecht@...loo.org,
        matti.lehtimaki@...il.com, quic_grosikop@...cinc.com
Cc:     linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/6] media: qcom: camss: csiphy-3ph: Add Gen2 v1.1
 two-phase MIPI CSI-2 DPHY init

On 07/11/2023 21:43, Konrad Dybcio wrote:
> 
> 
> On 11/5/23 18:45, Bryan O'Donoghue wrote:
>> Add a PHY configuration sequence for the sc8280xp which uses a Qualcomm
>> Gen 2 version 1.1 CSI-2 PHY.
>>
>> The PHY can be configured as two phase or three phase in C-PHY or D-PHY
>> mode. This configuration supports two-phase D-PHY mode.
>>
>> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>> ---
> Makes it sound like the current 2ph/3ph split is rather nonsensical?
> 
> Perhaps we should restructure it to match hw revision? Especially since
> one can get it from the hardware itself..
> 
> Konrad

For the C-PHY though we have to either add or remove caps - I forget 
which on ~ all of our reference platforms.

"The PHY can do it" but I'd be surprised to find there's a single real 
implementation of it outside of a silicon test bench.

---
bod