linux-kernel - Re: [PATCH v3 2/4] scsi: ufs-mediatek: support linkoff state during suspend

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Date:   Sun, 2 Feb 2020 20:05:31 +0530
From:   Alim Akhtar <alim.akhtar@...il.com>
To:     Stanley Chu <stanley.chu@...iatek.com>
Cc:     linux-scsi@...r.kernel.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Avri Altman <avri.altman@....com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Bean Huo (beanhuo)" <beanhuo@...ron.com>, asutoshd@...eaurora.org,
        Can Guo <cang@...eaurora.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bart Van Assche <bvanassche@....org>,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        open list <linux-kernel@...r.kernel.org>,
        Kuohong Wang <kuohong.wang@...iatek.com>,
        peter.wang@...iatek.com, chun-hung.wu@...iatek.com,
        andy.teng@...iatek.com
Subject: Re: [PATCH v3 2/4] scsi: ufs-mediatek: support linkoff state during suspend

Hi Stanley

On Wed, Jan 29, 2020 at 1:11 PM Stanley Chu <stanley.chu@...iatek.com> wrote:
>
> If system suspend or runtime suspend mode is configured as
> linkoff state, phy can be powered off and reference clock
> can be gated in MediaTek Chipsets.
>
> In the same time, remove redundant reference clock control
> in suspend and resume callbacks because such control can be
> well-handled in setup_clocks callback..
>
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>

> ---
>  drivers/scsi/ufs/ufs-mediatek.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
> index 7ac838cc15d1..d78897a14905 100644
> --- a/drivers/scsi/ufs/ufs-mediatek.c
> +++ b/drivers/scsi/ufs/ufs-mediatek.c
> @@ -167,7 +167,7 @@ static int ufs_mtk_setup_clocks(struct ufs_hba *hba, bool on,
>
>         switch (status) {
>         case PRE_CHANGE:
> -               if (!on) {
> +               if (!on && !ufshcd_is_link_active(hba)) {
>                         ufs_mtk_setup_ref_clk(hba, on);
>                         ret = phy_power_off(host->mphy);
>                 }
> @@ -437,10 +437,11 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>                 err = ufs_mtk_link_set_lpm(hba);
>                 if (err)
>                         return -EAGAIN;
> -               phy_power_off(host->mphy);
> -               ufs_mtk_setup_ref_clk(hba, false);
>         }
>
> +       if (!ufshcd_is_link_active(hba))
> +               phy_power_off(host->mphy);
> +
>         return 0;
>  }
>
> @@ -449,9 +450,10 @@ static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>         struct ufs_mtk_host *host = ufshcd_get_variant(hba);
>         int err;
>
> -       if (ufshcd_is_link_hibern8(hba)) {
> -               ufs_mtk_setup_ref_clk(hba, true);
> +       if (!ufshcd_is_link_active(hba))
>                 phy_power_on(host->mphy);
> +
> +       if (ufshcd_is_link_hibern8(hba)) {
>                 err = ufs_mtk_link_set_hpm(hba);
>                 if (err)
>                         return err;
> --
> 2.18.0



-- 
Regards,
Alim