linux-kernel - Re: [PATCH 0/2] Enable UFS ICE clock scaling

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Message-ID: <aRQqvbn6cuTBde5u@hu-arakshit-hyd.qualcomm.com>
Date: Wed, 12 Nov 2025 12:05:41 +0530
From: Abhinaba Rakshit <abhinaba.rakshit@....qualcomm.com>
To: Manivannan Sadhasivam <mani@...nel.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH 0/2] Enable UFS ICE clock scaling

On Fri, Oct 03, 2025 at 10:18:15PM +0530, Manivannan Sadhasivam wrote:
> On Wed, Oct 01, 2025 at 05:08:18PM +0530, Abhinaba Rakshit wrote:
> > This API enables dynamic scaling of the ICE (Inline Crypto Engine) clock,
> 
> Which API?

Will keep it more specific and update in patchset v2.

> 
> > which is tightly integrated with the host controller. It is invoked by the UFS 
> > host controller driver in response to clock scaling requests, ensuring
> > coordination between ICE and the host controller.
> > 
> > This API helps prevent degradation in storage read/write KPIs,
> > maintaining consistent I/O throughput performance.
> 
> I'd expect clock scaling to save some power, than 'preventing degradation in
> performance'.

The solution should achieve both objectives: maintaining functionality while
dynamically downscaling the clock during periods of low read/write activity to
reduce power consumption.
Will update with more details in patchset v2.

> 
> > 
> > The implementation has been tested using tiotest to verify that enabling ICE
> > does not negatively impact host controller I/O performance during
> > read/write operations.
> > 
> 
> On which platform?

Currently we have tested on Kodiak and Talos, with additional device-tree changes.
Will also update the tests details better in patchset v2.

> 
> - Mani
> 
> > Signed-off-by: Abhinaba Rakshit <abhinaba.rakshit@....qualcomm.com>
> > ---
> > Abhinaba Rakshit (2):
> >       soc: qcom: ice: enable ICE clock scaling API
> >       ufs: host: scale ICE clock
> > 
> >  drivers/soc/qcom/ice.c      | 25 +++++++++++++++++++++++++
> >  drivers/ufs/host/ufs-qcom.c | 14 ++++++++++++++
> >  include/soc/qcom/ice.h      |  1 +
> >  3 files changed, 40 insertions(+)
> > ---
> > base-commit: 3b9b1f8df454caa453c7fb07689064edb2eda90a
> > change-id: 20251001-enable-ufs-ice-clock-scaling-9c55598295f6
> > 
> > Best regards,
> > -- 
> > Abhinaba Rakshit <abhinaba.rakshit@....qualcomm.com>
> > 
> 
> -- 
> மணிவண்ணன் சதாசிவம்