linux-kernel - Re: [PATCH v2 1/3] scsi: ufs: qcom: Check gear against max gear in vop freq_to

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Message-ID: <b3c662ca-16bb-44df-ba68-faf55b1e3dfa@oss.qualcomm.com>
Date: Thu, 8 May 2025 17:30:40 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Ziqi Chen <quic_ziqichen@...cinc.com>, quic_cang@...cinc.com,
        bvanassche@....org, mani@...nel.org, beanhuo@...ron.com,
        avri.altman@....com, junwoo80.lee@...sung.com,
        martin.petersen@...cle.com, quic_nguyenb@...cinc.com,
        quic_nitirawa@...cinc.com, quic_rampraka@...cinc.com,
        neil.armstrong@...aro.org, luca.weiss@...rphone.com
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] scsi: ufs: qcom: Check gear against max gear in
 vop freq_to_gear()

On 5/7/25 9:44 AM, Ziqi Chen wrote:
> The vop freq_to_gear() may return a gear greater than the negotiated max
> gear, return the negotiated max gear if the mapped gear is greater than it.
> 
> Tested-by: Neil Armstrong <neil.armstrong@...aro.org>
> Signed-off-by: Ziqi Chen <quic_ziqichen@...cinc.com>
> 
> ---
> v1 - > v2:
> 1. Instead of return 'gear', return '0' directly if didn't find mapped
>    gear
> 2. Derectly return min_t(gear,max_gear) instead assign to 'gear' then
>    return it.
> ---
>  drivers/ufs/host/ufs-qcom.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 790da25cbaf3..7f10926100a5 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -2105,10 +2105,10 @@ static u32 ufs_qcom_freq_to_gear_speed(struct ufs_hba *hba, unsigned long freq)
>  		break;
>  	default:
>  		dev_err(hba->dev, "%s: Unsupported clock freq : %lu\n", __func__, freq);
> -		break;
> +		return 0;

That's UFS_PWM_DONT_CHANGE, please it so that the reader can more easily
make sense of the code.. Actually, perhaps this function could be tagged
to return an entry of this enum specifically

Konrad

>  	}
>  
> -	return gear;
> +	return min_t(u32, gear, hba->max_pwr_info.info.gear_rx);
>  }
>  
>  /*