linux-kernel - Re: [PATCH V4 4/4] arm64: dts: qcom: sm8550: Remove SDR104/SDR50 broken capabilities

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Message-ID: <564d2557-7ed0-4cf9-981c-fd427a0378c3@quicinc.com>
Date: Wed, 13 Aug 2025 16:50:53 +0530
From: Sarthak Garg <quic_sartgarg@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@....qualcomm.com>
CC: Krzysztof Kozlowski <krzk@...nel.org>,
        Ulf Hansson
	<ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Adrian Hunter
	<adrian.hunter@...el.com>, <linux-mmc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <quic_nguyenb@...cinc.com>,
        <quic_rampraka@...cinc.com>, <quic_pragalla@...cinc.com>,
        <quic_sayalil@...cinc.com>, <quic_nitirawa@...cinc.com>,
        <quic_bhaskarv@...cinc.com>, <kernel@....qualcomm.com>
Subject: Re: [PATCH V4 4/4] arm64: dts: qcom: sm8550: Remove SDR104/SDR50
 broken capabilities



On 8/5/2025 6:38 PM, Konrad Dybcio wrote:
> On 8/5/25 11:59 AM, Dmitry Baryshkov wrote:
>> On Tue, Aug 05, 2025 at 02:49:29PM +0530, Sarthak Garg wrote:
>>>
>>>
>>> On 8/1/2025 2:32 PM, Krzysztof Kozlowski wrote:
>>>> On 01/08/2025 10:45, Sarthak Garg wrote:
>>>>> The kernel now handles level shifter limitations affecting SD card
>>>>> modes, making it unnecessary to explicitly disable SDR104 and SDR50
>>>>> capabilities in the device tree.
>>>>>
>>>>> However, due to board-specific hardware constraints particularly related
>>>>> to level shifter in this case the maximum frequency for SD High-Speed
>>>>> (HS) mode must be limited to 37.5 MHz to ensure reliable operation of SD
>>>>> card in HS mode. This is achieved using the max-sd-hs-frequency property
>>>>> in the board DTS.
>>>>>
>>>>> Signed-off-by: Sarthak Garg <quic_sartgarg@...cinc.com>
>>>>> ---
>>>>>    arch/arm64/boot/dts/qcom/sm8550-hdk.dts                     | 1 +
>>>>>    arch/arm64/boot/dts/qcom/sm8550-mtp.dts                     | 1 +
>>>>>    arch/arm64/boot/dts/qcom/sm8550-sony-xperia-yodo-pdx234.dts | 1 +
>>>>>    arch/arm64/boot/dts/qcom/sm8550.dtsi                        | 3 ---
>>
>> You missed several devices which use SM8550. Please fix that.
> 
> I would be in favor of making this addition in the SoC dtsi and removing/
> altering it on a case by case basis, since as I explained in the threads
> of previous revisions, the fix for the limitation is additional on-board
> hardware
> 
> Konrad

@Krzysztof Kozlowski please let me know your view on placement of the 
max-sd-hs-frequency
DT property in SOC dtsi as per above comment.

Best regards,
Sarthak