linux-kernel - Re: [PATCH v4 3/7] scsi: ufs: Fix up auto hibern8 enablement

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Date:   Fri, 15 Nov 2019 11:33:19 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Avri Altman <Avri.Altman@....com>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        rnayak@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Bean Huo <beanhuo@...ron.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3/7] scsi: ufs: Fix up auto hibern8 enablement

On 2019-11-14 17:23, Avri Altman wrote:
>> 
>> 
>> Fix up possible unclocked register access to auto hibern8 register in 
>> resume path
>> and through sysfs entry. Meanwhile, enable auto hibern8 only after 
>> device is
>> fully initialized in probe path.
>> 
>> Signed-off-by: Can Guo <cang@...eaurora.org>
> Acked-by: Avri Altman <avri.altman@....com>
> 
>> ---
>>  drivers/scsi/ufs/ufs-sysfs.c | 17 +++++++++++------
>>  drivers/scsi/ufs/ufshcd.c    | 12 ++++++------
>>  2 files changed, 17 insertions(+), 12 deletions(-)
>> 
>> diff --git a/drivers/scsi/ufs/ufs-sysfs.c 
>> b/drivers/scsi/ufs/ufs-sysfs.c index
>> 969a36b..6c2f19e 100644
>> --- a/drivers/scsi/ufs/ufs-sysfs.c
>> +++ b/drivers/scsi/ufs/ufs-sysfs.c
>> @@ -126,13 +126,18 @@ static void ufshcd_auto_hibern8_update(struct
>> ufs_hba *hba, u32 ahit)
>>                 return;
>> 
>>         spin_lock_irqsave(hba->host->host_lock, flags);
>> -       if (hba->ahit == ahit)
>> -               goto out_unlock;
>> -       hba->ahit = ahit;
>> -       if (!pm_runtime_suspended(hba->dev))
>> -               ufshcd_writel(hba, hba->ahit, 
>> REG_AUTO_HIBERNATE_IDLE_TIMER);
>> -out_unlock:
>> +       if (hba->ahit != ahit)
>> +               hba->ahit = ahit;
>>         spin_unlock_irqrestore(hba->host->host_lock, flags);
>> +       if (!pm_runtime_suspended(hba->dev)) {
>> +               pm_runtime_get_sync(hba->dev);
>> +               ufshcd_hold(hba, false);
>> +               spin_lock_irqsave(hba->host->host_lock, flags);
>> +               ufshcd_writel(hba, hba->ahit, 
>> REG_AUTO_HIBERNATE_IDLE_TIMER);
>> +               spin_unlock_irqrestore(hba->host->host_lock, flags);
> Call ufshcd_auto_hibern8_enable instead of open coding?
> 

In that case, we would have to export ufshcd_auto_hibern8_enable() as it 
is static for now.
Shall do that.

Thanks,

Can Guo.

>> +               ufshcd_release(hba);
>> +               pm_runtime_put(hba->dev);
>> +       }
>>  }
>> 
>>  /* Convert Auto-Hibernate Idle Timer register value to microseconds 
>> */ diff --git
>> a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 
>> 525f8e6..f12f5a7
>> 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -6892,9 +6892,6 @@ static int ufshcd_probe_hba(struct ufs_hba *hba)
>>         /* UniPro link is active now */
>>         ufshcd_set_link_active(hba);
>> 
>> -       /* Enable Auto-Hibernate if configured */
>> -       ufshcd_auto_hibern8_enable(hba);
>> -
>>         ret = ufshcd_verify_dev_init(hba);
>>         if (ret)
>>                 goto out;
>> @@ -6945,6 +6942,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba)
>>         /* set the state as operational after switching to desired 
>> gear */
>>         hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
>> 
>> +       /* Enable Auto-Hibernate if configured */
>> +       ufshcd_auto_hibern8_enable(hba);
>> +
>>         /*
>>          * If we are in error handling context or in power management 
>> callbacks
>>          * context, no need to scan the host @@ -7962,12 +7962,12 @@ 
>> static int
>> ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
>>         if (hba->clk_scaling.is_allowed)
>>                 ufshcd_resume_clkscaling(hba);
>> 
>> -       /* Schedule clock gating in case of no access to UFS device 
>> yet */
>> -       ufshcd_release(hba);
>> -
>>         /* Enable Auto-Hibernate if configured */
>>         ufshcd_auto_hibern8_enable(hba);
>> 
>> +       /* Schedule clock gating in case of no access to UFS device 
>> yet */
>> +       ufshcd_release(hba);
>> +
>>         goto out;
>> 
>>  set_old_link_state:
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
>> Forum,
>> a Linux Foundation Collaborative Project