Re: [PATCH V1 0/3] Add DT-based gear and rate limiting support

Manivannan Sadhasivam
2025-07-23T14:41:13Z

On Tue, Jul 22, 2025 at 09:41:00PM GMT, Ram Kumar Dwivedi wrote:
> This patch series adds support for limiting the maximum high-speed
> gear and rate used by the UFS controller on Qualcomm platforms via
> device tree.
>
> Some automotive platforms, such as SA8155, require restricting the
> maximum gear or rate due to hardware limitations. To support this,

What do you mean by 'hardware limitation'? Please explain.

- Mani

> the driver is extended to parse two new optional DT properties and
> apply them during initialization. The default behavior remains
> unchanged if these properties are not specified.
>
> Ram Kumar Dwivedi (3):
> scsi: ufs: qcom: Add support for DT-based gear and rate limiting
> arm64: dts: qcom: sa8155: Add gear and rate limit properties to UFS
> dt-bindings: ufs: qcom: Document HS gear and rate limit properties
>
> .../devicetree/bindings/ufs/qcom,ufs.yaml | 10 +++++++
> arch/arm64/boot/dts/qcom/sm8150.dtsi | 3 ++
> drivers/ufs/host/ufs-qcom.c | 29 +++++++++++++++----
> 3 files changed, 36 insertions(+), 6 deletions(-)
>
> --
> 2.50.1
>

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