linux-kernel - Re: [PATCH RFT 0/7] arm64: qcom: allow up to 4 lanes for the Type-C DisplayPort Altmode

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Date: Fri, 24 May 2024 09:08:38 +0200
From: neil.armstrong@...aro.org
To: Luca Weiss <luca.weiss@...rphone.com>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>
Cc: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I
 <kishon@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Abhinav Kumar
 <quic_abhinavk@...cinc.com>, linux-arm-msm@...r.kernel.org,
 linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFT 0/7] arm64: qcom: allow up to 4 lanes for the Type-C
 DisplayPort Altmode

On 24/05/2024 08:51, Luca Weiss wrote:
> On Thu May 23, 2024 at 11:06 AM CEST,  wrote:
>> Hi Lucas,
>>
>> On 10/05/2024 08:51, Luca Weiss wrote:
>>> On Tue Apr 23, 2024 at 4:08 PM CEST,  wrote:
>>>> On 23/04/2024 15:03, Konrad Dybcio wrote:
>>>>>
>>>>>
>>>>> On 4/5/24 12:19, Luca Weiss wrote:
>>
>> <snip>
>>
>>>
>>> Next, with DP 4 lane (not working on mainline but still plugged into a
>>> screen) the diff is quite a bit bigger.
>>>
>>> See attachments for the full files:
>>> * usb_1_qmpphy_20240503_151052_android_4lane.txt
>>> * usb_1_qmpphy_20240503_122443_mainline_4lane.txt
>>>
>>> Not attaching the diff because it's quite a lot
>>> $ diff --ignore-case -U0 usb_1_qmpphy_20240503_151052_android_4lane.txt usb_1_qmpphy_20240503_122443_mainline_4lane.txt
>>>
>>> Not sure this is helpful to anyone, but at least wanted to share what
>>> I've done so far here.
>>
>> Thanks a lot for the traces, it founds out the QPHY_V3_DP_COM_PHY_MODE_CTRL stays at 0x3,
>> which means the mode doesn't get broadcasted to the phy because.... the retimer only broadcasts
>> the orientation and not the mode... and it works on the HDKs and the X13s because they don't have retimers.
> 
> Hi Neil,
> 
> This was it!
> 
>>
>> So I made the changes in nb7vpq904m and ptn36502 drivers to get the next mux and broadcast the typec mode,
>> if you find time could you test it ?
>>
>> Bjorn could you also test on the rb3gen2 ?
>>
>> The changes:
>> https://git.codelinaro.org/neil.armstrong/linux/-/commit/a61fb3b816ecbe28a12480367d9e09b700ec09e1
> 
> With this ptn36502 patch on top, I can confirm that DP 4-lane seems to
> work on qcm6490-fairphone-fp5 smartphone with DP over USB-C!
> 
> Tested with a USB-C dongle that only has a HDMI port on the other side
> (so no USB), and cat'ing dp_debug while connected showed num_lanes = 4
> 
> So feel free to add my:
> 
> Tested-by: Luca Weiss <luca.weiss@...rphone.com>

Thanks a lot for testing, spinning a v2 with those patches!

Neil

> 
> Regards
> Luca
> 
>> https://git.codelinaro.org/neil.armstrong/linux/-/commit/f6f976ff692bad430cd945f02b835e355f19632b
>>
>> Thanks,
>> Neil
>>
>>>
>>> Regards
>>> Luca
>>>
>>>>
>>>> Neil
>>>>
>>>>>
>>>>> Konrad
>>>
>>>
>