linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: x1e78100-t14s: Add audio playback over DisplayPort

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Message-ID: <487ff592-e67c-41c8-a398-f79aa6e5f69c@kernel.org>
Date: Wed, 17 Dec 2025 14:00:05 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Abel Vesa <abel.vesa@...aro.org>
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: x1e78100-t14s: Add audio
 playback over DisplayPort

On 17/12/2025 13:51, Konrad Dybcio wrote:
> On 12/17/25 1:38 PM, Krzysztof Kozlowski wrote:
>> On 17/12/2025 13:33, Konrad Dybcio wrote:
>>> On 12/17/25 1:00 PM, Krzysztof Kozlowski wrote:
>>>> Add necessary DAI links and DAI name prefixes to enable audio playback
>>>> over USB/DisplayPort and HDMI.  The HDMI port is not yet enabled, but it
>>>> should carry respective DAI name prefix regardless.
>>>>
>>>> Reviewed-by: Abel Vesa <abel.vesa@...aro.org>
>>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
>>>>
>>>> ---
>>>
>>> (something's inserting a \n before --- in your latest patches but I
>>
>> No, it is not. It was always like that and only recently git started
>> dropping it, but it is irrelevant.
>>
>>> don't know if this is a problem)
>>>
>>> [...]
>>>
>>>> +		displayport-2-dai-link {
>>>> +			link-name = "DisplayPort2 Playback";
>>>> +
>>>> +			codec {
>>>> +				sound-dai = <&mdss_dp2>;
>>>
>>> How does this work out with fw_devlink?
>>
>> How is this related to this patchset? Please stop nit-picking irrelevant
>> things.
> 
> I'm asking whether this is going to break sync_state because you're not
> enabling mdss_dp2 - I believe that's a fair question..

DTS description is independent of driver, thus this is correct code
regardless whether there is interconnect involved anywhere or not. I
don't have the answer how this affects interconnect, but I see no reason
anyone would create such ICC path - between hardware and fake SW construct.

Best regards,
Krzysztof