[PATCH v5 0/8] Support Multi-frequency scale for UFS

[Luca Weiss]

Hi Ziqi,

On Thu Feb 13, 2025 at 9:00 AM CET, Ziqi Chen wrote:
> With OPP V2 enabled, devfreq can scale clocks amongst multiple frequency
> plans. However, the gear speed is only toggled between min and max during
> clock scaling. Enable multi-level gear scaling by mapping clock frequencies
> to gear speeds, so that when devfreq scales clock frequencies we can put
> the UFS link at the appropraite gear speeds accordingly.

I believe this series is causing issues on SM6350:

[    0.859449] ufshcd-qcom 1d84000.ufshc: ufs_qcom_freq_to_gear_speed: Unsupported clock freq : 200000000
[    0.886668] ufshcd-qcom 1d84000.ufshc: UNIPRO clk freq 200 MHz not supported
[    0.903791] devfreq 1d84000.ufshc: dvfs failed with (-22) error

That's with this patch, I actually haven't tried without on v6.15-rc3
https://lore.kernel.org/all/20250314-sm6350-ufs-things-v1-2-3600362cc52c@fairphone.com/

I believe the issue appears because core clk and unipro clk rates don't
match on this platform, so this 200 MHz for GCC_UFS_PHY_AXI_CLK is not a
valid unipro clock rate, but for GCC_UFS_PHY_UNIPRO_CORE_CLK it's
specified to 150 MHz in the opp table.

Regards
Luca

>
> This series has been tested on below platforms -
> sm8550 mtp + UFS3.1
> SM8650 MTP + UFS3.1
> SM8750 MTP + UFS4.0