linux-kernel - Re: [PATCH 3/6] media: qcom: camss: csiphy-3ph: Add Gen2 v1.2.2 two-phase MIPI CSI-2 DPHY init

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Date: Sat, 22 Jun 2024 13:20:34 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>, gchan9527@...il.com,
 Robert Foss <rfoss@...nel.org>, Todor Tomov <todor.too@...il.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, cros-qcom-dts-watchers@...omium.org,
 Bjorn Andersson <andersson@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] media: qcom: camss: csiphy-3ph: Add Gen2 v1.2.2
 two-phase MIPI CSI-2 DPHY init

On 21.06.2024 1:25 PM, Bryan O'Donoghue wrote:
> On 21/06/2024 10:40, George Chan via B4 Relay wrote:
>> From: George Chan <gchan9527@...il.com>
>>
>> Add a PHY configuration sequence for the sc7180 which uses a Qualcomm
>> Gen 2 version 1.2.2 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: George Chan <gchan9527@...il.com>
>> ---
>>   .../platform/qcom/camss/camss-csiphy-3ph-1-0.c     | 120 +++++++++++++++++++++
>>   1 file changed, 120 insertions(+)
>>
>> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
>> index df7e93a5a4f6..181bb7f7c300 100644
>> --- a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
>> +++ b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
>> @@ -348,6 +348,121 @@ csiphy_reg_t lane_regs_sm8250[5][20] = {
>>       },
>>   };
>>   +/* GEN2 1.2.2 2PH */
> 
> This is the init sequence for 1_2_1 not 1_2_2
> 
> https://review.lineageos.org/c/LineageOS/android_kernel_xiaomi_sm8250/+/311931/10/techpack/camera/drivers/cam_sensor_module/cam_csiphy/include/cam_csiphy_1_2_1_hwreg.h
> 
> https://review.lineageos.org/c/LineageOS/android_kernel_xiaomi_sm8250/+/311931/10/techpack/camera/drivers/cam_sensor_module/cam_csiphy/include/cam_csiphy_1_2_2_hwreg.h

FWIW 1.2.2 seems to be the desired one: [1]

Konrad

[1] https://git.codelinaro.org/clo/la/kernel/msm-4.14/-/blob/UC.UM.1.0.r1-02500-sa8155.0/arch/arm64/boot/dts/qcom/atoll-camera.dtsi#L22