linux-kernel - Re: [PATCH V5 04/11] phy: qcom-qmp-ufs: Refactor UFS PHY reset

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Message-ID: <mwcqp3mxuheffc6x7w4w5mykqc57ovmvyrmh3ky5czjf54wnag@fxnxgsoi6y2u>
Date: Wed, 21 May 2025 14:26:37 +0100
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Nitin Rawat <quic_nitirawa@...cinc.com>
Cc: vkoul@...nel.org, kishon@...nel.org, 
	James.Bottomley@...senpartnership.com, martin.petersen@...cle.com, bvanassche@....org, 
	andersson@...nel.org, neil.armstrong@...aro.org, dmitry.baryshkov@....qualcomm.com, 
	konrad.dybcio@....qualcomm.com, quic_rdwivedi@...cinc.com, quic_cang@...cinc.com, 
	linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH V5 04/11] phy: qcom-qmp-ufs: Refactor UFS PHY reset

On Thu, May 15, 2025 at 09:57:15PM +0530, Nitin Rawat wrote:
> Refactor the UFS PHY reset handling to parse the reset logic only once
> during initialization, instead of every resume.
> 
> As part of this change, move the UFS PHY reset parsing logic from
> qmp_phy_power_on to the new qmp_ufs_phy_init function.
> 

More importantly, you are introducing the phy_ops::init callback, which
should've been mentioned.

> Co-developed-by: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
> Signed-off-by: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
> Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 59 +++++++++++++------------
>  1 file changed, 31 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> index ade8e9c4b9ae..33d238cf49aa 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> @@ -1800,38 +1800,11 @@ static int qmp_ufs_com_exit(struct qmp_ufs *qmp)
>  static int qmp_ufs_power_on(struct phy *phy)
>  {
>  	struct qmp_ufs *qmp = phy_get_drvdata(phy);
> -	const struct qmp_phy_cfg *cfg = qmp->cfg;
>  	int ret;
>  	dev_vdbg(qmp->dev, "Initializing QMP phy\n");
>  
> -	if (cfg->no_pcs_sw_reset) {
> -		/*
> -		 * Get UFS reset, which is delayed until now to avoid a
> -		 * circular dependency where UFS needs its PHY, but the PHY
> -		 * needs this UFS reset.
> -		 */
> -		if (!qmp->ufs_reset) {
> -			qmp->ufs_reset =
> -				devm_reset_control_get_exclusive(qmp->dev,
> -								 "ufsphy");
> -
> -			if (IS_ERR(qmp->ufs_reset)) {
> -				ret = PTR_ERR(qmp->ufs_reset);
> -				dev_err(qmp->dev,
> -					"failed to get UFS reset: %d\n",
> -					ret);
> -
> -				qmp->ufs_reset = NULL;
> -				return ret;
> -			}
> -		}
> -	}
> -
>  	ret = qmp_ufs_com_init(qmp);
> -	if (ret)
> -		return ret;
> -
> -	return 0;
> +	return ret;

This can't be:
	return qmp_ufs_com_init; ?

- Mani

-- 
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