Re: [PATCH v2 2/5] scsi: ufs: qcom: Simplify handling of devm_phy_get()

[Bjorn Andersson <bjorn.andersson@linaro.org>]

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@linaro.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@linaro.org>

Regards,
Bjorn

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