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

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Message-ID: <267dad52-0f22-4e5b-a929-a77cdc062490@kernel.org>
Date: Fri, 19 Dec 2025 13:57:32 +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 19/12/2025 13:53, Konrad Dybcio wrote:
> On 12/17/25 2:00 PM, Krzysztof Kozlowski wrote:
>> 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.
> 
> sync_state isn't exclusive to the interconnect framework
> 
> In any case, could you please confirm/deny that sound still works as
> expected with linux-next/master + this patch alone and we move on?

It was working all the time - I was using it on my machine for 3 months
already. Other people are also using it, because it is part of our
laptop tree and no regressions or issues were reported.

Best regards,
Krzysztof