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

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Date:   Fri, 22 Apr 2022 11:51:01 -0500
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     martin.petersen@...cle.com, jejb@...ux.ibm.com,
        avri.altman@....com, alim.akhtar@...sung.com,
        bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org,
        quic_asutoshd@...cinc.com, quic_cang@...cinc.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] scsi: ufs: qcom: Simplify handling of devm_phy_get()

On Fri, Apr 22, 2022 at 06:51:37PM +0530, 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 5db0fd922062..5f0a8f646eb5 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(dev, "Failed to get PHY: %d\n", err);

Risking sounding like a bad broken record, but I think this too could
use dev_err_probe().

Looks good to me otherwise!

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