On 8/5/2025 6:38 PM, Konrad Dybcio wrote:

On 8/5/25 11:59 AM, Dmitry Baryshkov wrote:

quoted

On Tue, Aug 05, 2025 at 02:49:29PM +0530, Sarthak Garg wrote:

quoted

On 8/1/2025 2:32 PM, Krzysztof Kozlowski wrote:

quoted

On 01/08/2025 10:45, Sarthak Garg wrote:

quoted

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 <redacted>
---
   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