linux-kernel - Re: [PATCH v2 1/2] scsi: ufs: Suspend clk scaling on no request

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Message-ID: <97bb4c5a-46f3-4a81-96bf-a3147d9ec78b@acm.org>
Date: Thu, 27 Jun 2024 09:35:47 -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 1/2] scsi: ufs: Suspend clk scaling on no request

On 6/27/24 1:37 AM, Ram Prakash Gupta wrote:
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 1b65e6ae4137..9f935e5c60e8 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -1560,7 +1560,8 @@ static int ufshcd_devfreq_target(struct device *dev,
>   		ktime_to_us(ktime_sub(ktime_get(), start)), ret);
>   
>   out:
> -	if (sched_clk_scaling_suspend_work && !scale_up)
> +	if (sched_clk_scaling_suspend_work &&
> +			(!scale_up || hba->clk_scaling.suspend_on_no_request))
>   		queue_work(hba->clk_scaling.workq,
>   			   &hba->clk_scaling.suspend_work);
>   
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
> index bad88bd91995..c14607f2890b 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -457,6 +457,7 @@ struct ufs_clk_scaling {
>   	bool is_initialized;
>   	bool is_busy_started;
>   	bool is_suspended;
> +	bool suspend_on_no_request;
>   };
>   
>   #define UFS_EVENT_HIST_LENGTH 8

Who are the other vendors that support clock scaling? I'm asking because
I don't think that the behavior change introduced by this patch should
depend on the SoC vendor.

Thanks,

Bart.