linux-kernel - Re: [PATCH V2 0/2] Suspend clk scaling when there is no request

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Message-ID: <ad0a495d-b1c4-4e87-a9b8-77df2de8927a@acm.org>
Date: Fri, 28 Jun 2024 12:34:16 -0700
From: Bart Van Assche <bvanassche@....org>
To: Ram Prakash Gupta <quic_rampraka@...cinc.com>,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
 "Martin K. Petersen" <martin.petersen@...cle.com>,
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Alim Akhtar <alim.akhtar@...sung.com>, Avri Altman <avri.altman@....com>,
 linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, quic_cang@...cinc.com,
 quic_nguyenb@...cinc.com, quic_pragalla@...cinc.com,
 quic_nitirawa@...cinc.com
Subject: Re: [PATCH V2 0/2] Suspend clk scaling when there is no request

On 6/27/24 1:37 AM, Ram Prakash Gupta wrote:
> Currently ufs clk scaling is getting suspended only when the
> clks are scaled down, but next when high load is generated its
> adding a huge amount of latency in scaling up the clk and complete
> the request post that.
> 
> Now if the scaling is suspended in its existing state, and when high
> load is generated it is helping improve the random performance KPI by
> 28%. So suspending the scaling when there is no request. And the clk
> would be put in low scaled state when the actual request load is low.
> 
> Making this change as optional for other vendor by having the check
> enabled using vops as for some vendor suspending without bringing the
> clk in low scaled state might have impact on power consumption on the
> SoC.

For both patches:

Reviewed-by: Bart Van Assche <bvanassche@....org>