linux-kernel - Re: [PATCH v1 4/4] scsi: ufs-mediatek: configure and enable clk-gating

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Date:   Fri, 20 Dec 2019 00:03:07 +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>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        open list <linux-kernel@...r.kernel.org>,
        "Bean Huo (beanhuo)" <beanhuo@...ron.com>,
        Kuohong Wang <kuohong.wang@...iatek.com>,
        peter.wang@...iatek.com, chun-hung.wu@...iatek.com,
        andy.teng@...iatek.com
Subject: Re: [PATCH v1 4/4] scsi: ufs-mediatek: configure and enable clk-gating

On Fri, Dec 13, 2019 at 2:42 PM Stanley Chu <stanley.chu@...iatek.com> wrote:
>
> Enable clk-gating with customized delayed timer value in
> MediaTek Chipsets.
>
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>

Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>

> ---
>  drivers/scsi/ufs/ufs-mediatek.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
> index 71e2e0e4ea11..282ad06ec846 100644
> --- a/drivers/scsi/ufs/ufs-mediatek.c
> +++ b/drivers/scsi/ufs/ufs-mediatek.c
> @@ -205,6 +205,9 @@ static int ufs_mtk_init(struct ufs_hba *hba)
>         /* Enable runtime autosuspend */
>         hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
>
> +       /* Enable clock-gating */
> +       hba->caps |= UFSHCD_CAP_CLK_GATING;
> +
>         /*
>          * ufshcd_vops_init() is invoked after
>          * ufshcd_setup_clock(true) in ufshcd_hba_init() thus
> @@ -293,6 +296,23 @@ static int ufs_mtk_pre_link(struct ufs_hba *hba)
>         return ret;
>  }
>
> +static void ufs_mtk_setup_clk_gating(struct ufs_hba *hba)
> +{
> +       unsigned long flags;
> +       u32 ah_ms;
> +
> +       if (ufshcd_is_clkgating_allowed(hba)) {
> +               if (ufshcd_is_auto_hibern8_supported(hba) && hba->ahit)
> +                       ah_ms = FIELD_GET(UFSHCI_AHIBERN8_TIMER_MASK,
> +                                         hba->ahit);
> +               else
> +                       ah_ms = 10;
> +               spin_lock_irqsave(hba->host->host_lock, flags);
> +               hba->clk_gating.delay_ms = ah_ms + 5;
> +               spin_unlock_irqrestore(hba->host->host_lock, flags);
> +       }
> +}
> +
>  static int ufs_mtk_post_link(struct ufs_hba *hba)
>  {
>         /* disable device LCC */
> @@ -308,6 +328,8 @@ static int ufs_mtk_post_link(struct ufs_hba *hba)
>                         FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3));
>         }
>
> +       ufs_mtk_setup_clk_gating(hba);
> +
>         return 0;
>  }
>
> --
> 2.18.0



-- 
Regards,
Alim