linux-kernel - Re: [PATCH v1 1/1] scsi: ufs: mcq: Use active

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Date:   Wed, 8 Mar 2023 11:12:53 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Asutosh Das <quic_asutoshd@...cinc.com>
Cc:     quic_cang@...cinc.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, quic_nguyenb@...cinc.com,
        quic_xiaosenh@...cinc.com, stanley.chu@...iatek.com,
        adrian.hunter@...el.com, bvanassche@....org, avri.altman@....com,
        beanhuo@...ron.com, linux-arm-msm@...r.kernel.org,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/1] scsi: ufs: mcq: Use active_reqs to check busy in
 clock scaling

On Tue, Mar 07, 2023 at 07:00:09PM -0800, Asutosh Das wrote:
> Multi Circular Queue doesn't use outstanding_reqs.
> But the ufs clock scaling functions use outstanding_reqs to
> determine if there're requests pending. When MCQ is enabled
> this check always returns false.
> 
> Hence use active_reqs to check if there're pending requests.
> 
> Signed-off-by: Asutosh Das <quic_asutoshd@...cinc.com>

This looks like a fix to me. Hence there should be a fixes tag. With that,

Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>

Thanks,
Mani

> ---
>  drivers/ufs/core/ufshcd.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 172d25fef740..c6b35123c83b 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -1500,7 +1500,7 @@ static int ufshcd_devfreq_get_dev_status(struct device *dev,
>  	scaling->window_start_t = curr_t;
>  	scaling->tot_busy_t = 0;
>  
> -	if (hba->outstanding_reqs) {
> +	if (scaling->active_reqs) {
>  		scaling->busy_start_t = curr_t;
>  		scaling->is_busy_started = true;
>  	} else {
> @@ -2118,7 +2118,7 @@ static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba)
>  
>  	spin_lock_irqsave(hba->host->host_lock, flags);
>  	hba->clk_scaling.active_reqs--;
> -	if (!hba->outstanding_reqs && scaling->is_busy_started) {
> +	if (!scaling->active_reqs && scaling->is_busy_started) {
>  		scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
>  					scaling->busy_start_t));
>  		scaling->busy_start_t = 0;
> -- 
> 2.7.4
> 

-- 
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