linux-kernel - Re: [PATCH v4 2/3] scsi: ufs: core: Add UFS RTC support

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Date:   Mon, 11 Dec 2023 17:39:08 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Bean Huo <beanhuo@...pp.de>
Cc:     avri.altman@....com, bvanassche@....org, alim.akhtar@...sung.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        quic_cang@...cinc.com, quic_asutoshd@...cinc.com,
        beanhuo@...ron.com, thomas@...ch.de, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, mikebi@...ron.com, lporzio@...ron.com
Subject: Re: [PATCH v4 2/3] scsi: ufs: core: Add UFS RTC support

On Sun, Dec 10, 2023 at 08:15:15PM +0100, Bean Huo wrote:
> On Fri, 2023-12-08 at 23:01 +0530, Manivannan Sadhasivam wrote:
> > > > 
> > > > Thank you for your reviews. I will incorporate the suggested
> > > > changes
> > > > into the patch, addressing all comments except for the RTC mode
> > > > switch.
> > > > The proposal is to perform the RTC mode switch during UFS
> > > > provisioning,
> > > > not at runtime in the UFS online phase. This approach ensures
> > > > that the
> > > > UFS configuration is populated based on the RTC configuration
> > > > established during provisioning. It is advisable not to change
> > > > the RTC
> > > > mode after provisioning is complete. Additionally, the usage of
> > > > tv_sec,
> > > > which returns time elapsed since boot, suggests that there is no
> > > > issue
> > > > with utilizing the RTC in this context.
> > > 
> > > Except that the warning will be issued to users after each 10s for
> > > 40 years.
> > > Atleast get rid of that.
> > > 
> > 
> > I tried this series on Qcom RB5 board and found the issue due to the
> > usage of
> > UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH flag. When this flag is
> > set,
> > ufshcd_device_init() will be called twice due to reinit of the
> > controller and
> > PHY.
> > 
> > Since RTC work is initialized and scheduled from
> > ufshcd_device_init(), panic
> > happens during second time. Is it possible to move RTC init outside
> > of
> > ufshcd_device_init(). Maybe you can parse RTC params in
> > ufshcd_device_init()
> > and initialize the work elsewhere. Or you can cancel the work before
> > calling
> > ufshcd_device_init() second time.
> > 
> > - Mani
> 
> 
> Thank you for your review. I have moved the INIT_DELAYED_WORK(&hba-
> >ufs_rtc_update_work, ufshcd_rtc_work) to ufshcd_init() from
> ufs_init_rtc(). This modification has been tested on the Qcom platform.

This works, thanks!

- Mani

> Regarding the warning, instead of removing it entirely, I have switched
> it to dev_dbg. This adjustment is made with the consideration that some
> form of customer notification is still necessary.
> 
> changes as below:
> 
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 953d50cc4256..cb6b0c286367 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -8205,7 +8205,7 @@ static void ufshcd_update_rtc(struct ufs_hba
> *hba)
>         ktime_get_real_ts64(&ts64);
>  
>         if  (ts64.tv_sec < hba->dev_info.rtc_time_baseline) {
> -               dev_warn(hba->dev, "%s: Current time precedes previous
> setting!\n", __func__);
> +               dev_dbg(hba->dev, "%s: Current time precedes previous
> setting!\n", __func__);
>                 return;
>         }
>         /*
> @@ -8270,8 +8270,6 @@ static void  ufs_init_rtc(struct ufs_hba *hba, u8
> *desc_buf)
>          * update work, and let user configure by sysfs node according
> to specific circumstance.
>          */
>         hba->dev_info.rtc_update_period = 0;
> -
> -       INIT_DELAYED_WORK(&hba->ufs_rtc_update_work, ufshcd_rtc_work);
>  }
>  
>  static int ufs_get_device_desc(struct ufs_hba *hba)
> @@ -10634,8 +10632,8 @@ int ufshcd_init(struct ufs_hba *hba, void
> __iomem *mmio_base, unsigned int irq)
>                                                 UFS_SLEEP_PWR_MODE,
>                                                
> UIC_LINK_HIBERN8_STATE);
>  
> -       INIT_DELAYED_WORK(&hba->rpm_dev_flush_recheck_work,
> -                         ufshcd_rpm_dev_flush_recheck_work);
> +       INIT_DELAYED_WORK(&hba->rpm_dev_flush_recheck_work,
> ufshcd_rpm_dev_flush_recheck_work);
> +       INIT_DELAYED_WORK(&hba->ufs_rtc_update_work, ufshcd_rtc_work);
>  
>         /* Set the default auto-hiberate idle timer value to 150 ms */
>         if (ufshcd_is_auto_hibern8_supported(hba) && !hba->ahit) {
> 
> Kind regards,
> Bean

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