linux-kernel - RE: [PATCH v1 1/2] scsi: ufs: Use ufshcd_config_pwr

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Date:   Wed, 12 Feb 2020 12:21:43 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Can Guo <cang@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "nguyenb@...eaurora.org" <nguyenb@...eaurora.org>,
        "hongwus@...eaurora.org" <hongwus@...eaurora.org>,
        "rnayak@...eaurora.org" <rnayak@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        "saravanak@...gle.com" <saravanak@...gle.com>,
        "salyzyn@...gle.com" <salyzyn@...gle.com>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Bean Huo <beanhuo@...ron.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bart Van Assche <bvanassche@....org>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1 1/2] scsi: ufs: Use ufshcd_config_pwr_mode() when scale
 gear

Hi,

> 
> When scale gear, use ufshcd_config_pwr_mode() instead of
> ufshcd_change_power_mode() so that
> vops_pwr_change_notify(PRE_CHANGE)
> can be utilized to allow vendors use customized settings before change
> the power mode.
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>
> ---
>  drivers/scsi/ufs/ufshcd.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index adcce41..67bd4f2 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -1059,8 +1059,7 @@ static int ufshcd_scale_gear(struct ufs_hba *hba,
> bool scale_up)
>         }
> 
>         /* check if the power mode needs to be changed or not? */
> -       ret = ufshcd_change_power_mode(hba, &new_pwr_info);
> -
> +       ret = ufshcd_config_pwr_mode(hba, &new_pwr_info);

You might want to inform ufshcd_config_pwr_mode() of the caller,
As now it will be called much more frequently, and you want/don't want
To call your vops on probe but not on scale_gear?

Also, Alim exported ufshcd_config_pwr_mode a while ago,
In commit 0d846e703dc8 "scsi: ufs: make ufshcd_config_pwr_mode of non-static func"),
But nobody uses it outside ufshcd - so maybe revert this commit as part of this series?



>         if (ret)
>                 dev_err(hba->dev, "%s: failed err %d, old gear: (tx %d rx %d), new
> gear: (tx %d rx %d)",
>                         __func__, ret,
> @@ -4126,8 +4125,6 @@ int ufshcd_config_pwr_mode(struct ufs_hba *hba,
>                 memcpy(&final_params, desired_pwr_mode, sizeof(final_params));
> 
>         ret = ufshcd_change_power_mode(hba, &final_params);
> -       if (!ret)
> -               ufshcd_print_pwr_info(hba);
> 
>         return ret;
>  }
> @@ -7157,6 +7154,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba,
> bool async)
>                                         __func__, ret);
>                         goto out;
>                 }
> +               ufshcd_print_pwr_info(hba);
>         }
> 
>         /* set the state as operational after switching to desired gear */
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
> Forum,
> a Linux Foundation Collaborative Project