linux-kernel - Re: [PATCH v2 2/5] scsi: ufs: qcom: Simplify handling of devm_phy

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Message-ID: <20220425130108.2noffk7p6lyakcec@halaneylaptop>
Date:   Mon, 25 Apr 2022 08:01:08 -0500
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        martin.petersen@...cle.com, jejb@...ux.ibm.com,
        avri.altman@....com, alim.akhtar@...sung.com,
        linux-arm-msm@...r.kernel.org, quic_asutoshd@...cinc.com,
        quic_cang@...cinc.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, bvanassche@....org
Subject: Re: [PATCH v2 2/5] scsi: ufs: qcom: Simplify handling of
 devm_phy_get()

On Sat, Apr 23, 2022 at 08:16:55AM -0700, Bjorn Andersson wrote:
> On Sat 23 Apr 07:02 PDT 2022, Manivannan Sadhasivam wrote:
> 
> > There is no need to call devm_phy_get() if ACPI is used, so skip it.
> > The "host->generic_phy" pointer should already be NULL due to the kzalloc,
> > so no need to set it NULL again.
> > 
> > Also, don't print the error message in case of -EPROBE_DEFER and return
> > the error code directly.
> > 
> > While at it, also remove the comment that has no relationship with
> > devm_phy_get().
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  drivers/scsi/ufs/ufs-qcom.c | 26 +++++---------------------
> >  1 file changed, 5 insertions(+), 21 deletions(-)
> > 
> > diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> > index bee81b45299e..6ee33cc0ad09 100644
> > --- a/drivers/scsi/ufs/ufs-qcom.c
> > +++ b/drivers/scsi/ufs/ufs-qcom.c
> > @@ -1022,28 +1022,12 @@ static int ufs_qcom_init(struct ufs_hba *hba)
> >  		err = 0;
> >  	}
> >  
> > -	/*
> > -	 * voting/devoting device ref_clk source is time consuming hence
> > -	 * skip devoting it during aggressive clock gating. This clock
> > -	 * will still be gated off during runtime suspend.
> > -	 */
> > -	host->generic_phy = devm_phy_get(dev, "ufsphy");
> > -
> > -	if (host->generic_phy == ERR_PTR(-EPROBE_DEFER)) {
> > -		/*
> > -		 * UFS driver might be probed before the phy driver does.
> > -		 * In that case we would like to return EPROBE_DEFER code.
> > -		 */
> > -		err = -EPROBE_DEFER;
> > -		dev_warn(dev, "%s: required phy device. hasn't probed yet. err = %d\n",
> > -			__func__, err);
> > -		goto out_variant_clear;
> > -	} else if (IS_ERR(host->generic_phy)) {
> > -		if (has_acpi_companion(dev)) {
> > -			host->generic_phy = NULL;
> > -		} else {
> > +	if (!has_acpi_companion(dev)) {
> > +		host->generic_phy = devm_phy_get(dev, "ufsphy");
> > +		if (IS_ERR(host->generic_phy)) {
> >  			err = PTR_ERR(host->generic_phy);
> > -			dev_err(dev, "%s: PHY get failed %d\n", __func__, err);
> > +			if (err != -EPROBE_DEFER)
> > +				dev_err_probe(dev, err, "Failed to get PHY\n");
> 
> I believe the idiomatic form is:
> 			err = dev_err_probe(dev, PTR_ERR(host->generic_phy), "Failed to get PHY\n");
> 
> 
> But as with the previous patch, please remove the condition and you have
> my:
> 
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> Regards,
> Bjorn

With the Bjorn's suggested change applied:
Reviewed-by: Andrew Halaney <ahalaney@...hat.com>

Thanks,
Andrew

> 
> >  			goto out_variant_clear;
> >  		}
> >  	}
> > -- 
> > 2.25.1
> > 
>