Re: [PATCH v3 1/4] scsi: ufs-mediatek: ensure UniPro is not powered down before linkup

From: Alim Akhtar <alim.akhtar@gmail.com>
To: Stanley Chu <stanley.chu@mediatek.com>
Cc: linux-scsi@vger.kernel.org,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	andy.teng@mediatek.com,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	chun-hung.wu@mediatek.com,
	Kuohong Wang <kuohong.wang@mediatek.com>,
	open list <linux-kernel@vger.kernel.org>,
	Avri Altman <avri.altman@wdc.com>, Can Guo <cang@codeaurora.org>,
	linux-mediatek@lists.infradead.org, peter.wang@mediatek.com,
	Alim Akhtar <alim.akhtar@samsung.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	asutoshd@codeaurora.org, Bart Van Assche <bvanassche@acm.org>,
	linux-arm-kernel@lists.infradead.org,
	"Bean Huo \(beanhuo\)" <beanhuo@micron.com>
Subject: Re: [PATCH v3 1/4] scsi: ufs-mediatek: ensure UniPro is not powered down before linkup
Date: Sun, 2 Feb 2020 20:04:55 +0530	[thread overview]
Message-ID: <CAGOxZ521Vz4EcmWApZLqcDwkwa-XHLFLDx2n1HRht0Pf0fFkmw@mail.gmail.com> (raw)
In-Reply-To: <20200129073902.5786-2-stanley.chu@mediatek.com>

HI Stanley

On Wed, Jan 29, 2020 at 1:09 PM Stanley Chu <stanley.chu@mediatek.com> wrote:
>
> MediaTek Chipsets can enter proprietary UniPro low-power mode during
> suspend while link is in hibern8 state. Make sure leaving low-power
> mode before every link startup to prevent lockup in any possible error recovery
> path.
>
> In the same time, re-factor related funcitons to improve code readability.
>
> Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>

Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
> ---
>  drivers/scsi/ufs/ufs-mediatek.c | 19 ++++++++++---------
>  1 file changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
> index 53eae5fe2ade..7ac838cc15d1 100644
> --- a/drivers/scsi/ufs/ufs-mediatek.c
> +++ b/drivers/scsi/ufs/ufs-mediatek.c
> @@ -30,6 +30,11 @@
>  #define ufs_mtk_device_reset_ctrl(high, res) \
>         ufs_mtk_smc(UFS_MTK_SIP_DEVICE_RESET, high, res)
>
> +#define ufs_mtk_unipro_powerdown(hba, powerdown) \
> +       ufshcd_dme_set(hba, \
> +                      UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0), \
> +                      powerdown)
> +
>  static void ufs_mtk_cfg_unipro_cg(struct ufs_hba *hba, bool enable)
>  {
>         u32 tmp;
> @@ -290,6 +295,8 @@ static int ufs_mtk_pre_link(struct ufs_hba *hba)
>         int ret;
>         u32 tmp;
>
> +       ufs_mtk_unipro_powerdown(hba, 0);
> +
>         /* disable deep stall */
>         ret = ufshcd_dme_get(hba, UIC_ARG_MIB(VS_SAVEPOWERCONTROL), &tmp);
>         if (ret)
> @@ -390,9 +397,7 @@ static int ufs_mtk_link_set_hpm(struct ufs_hba *hba)
>         if (err)
>                 return err;
>
> -       err = ufshcd_dme_set(hba,
> -                            UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
> -                            0);
> +       err = ufs_mtk_unipro_powerdown(hba, 0);
>         if (err)
>                 return err;
>
> @@ -413,14 +418,10 @@ static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
>  {
>         int err;
>
> -       err = ufshcd_dme_set(hba,
> -                            UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
> -                            1);
> +       err = ufs_mtk_unipro_powerdown(hba, 1);
>         if (err) {
>                 /* Resume UniPro state for following error recovery */
> -               ufshcd_dme_set(hba,
> -                              UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
> -                              0);
> +               ufs_mtk_unipro_powerdown(hba, 0);
>                 return err;
>         }
>
> --
> 2.18.0


-- 
Regards,
Alim

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