linux-kernel - Re: [PATCH v4 02/10] scsi: ufs: Add flags pm_op_in_progress and is_sys

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Message-ID: <aa01ddf1b91cb06a989bb47e001134ce@codeaurora.org>
Date:   Mon, 28 Jun 2021 15:11:45 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, ziqichen@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Satya Tangirala <satyat@...gle.com>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 02/10] scsi: ufs: Add flags pm_op_in_progress and
 is_sys_suspended

On 2021-06-25 01:35, Bart Van Assche wrote:
> On 6/23/21 12:35 AM, Can Guo wrote:
>> @@ -9141,6 +9143,8 @@ static int ufshcd_suspend(struct ufs_hba *hba)
>> 
>>  	if (!hba->is_powered)
>>  		return 0;
>> +
>> +	hba->pm_op_in_progress = true;
>>  	/*
>>  	 * Disable the host irq as host controller as there won't be any
>>  	 * host controller transaction expected till resume.
>> @@ -9160,6 +9164,7 @@ static int ufshcd_suspend(struct ufs_hba *hba)
>>  	ufshcd_vreg_set_lpm(hba);
>>  	/* Put the host controller in low power mode if possible */
>>  	ufshcd_hba_vreg_set_lpm(hba);
>> +	hba->pm_op_in_progress = false;
>>  	return ret;
>>  }
>> 
>> @@ -9179,6 +9184,7 @@ static int ufshcd_resume(struct ufs_hba *hba)
>>  	if (!hba->is_powered)
>>  		return 0;
>> 
>> +	hba->pm_op_in_progress = true;
>>  	ufshcd_hba_vreg_set_hpm(hba);
>>  	ret = ufshcd_vreg_set_hpm(hba);
>>  	if (ret)
>> @@ -9198,6 +9204,7 @@ static int ufshcd_resume(struct ufs_hba *hba)
>>  out:
>>  	if (ret)
>>  		ufshcd_update_evt_hist(hba, UFS_EVT_RESUME_ERR, (u32)ret);
>> +	hba->pm_op_in_progress = false;
>>  	return ret;
>>  }
> 
> Has it been considered to check dev->power.runtime_status instead of
> introducing the pm_op_in_progress variable?

ufshcd_resume() is also used by system resume, while runtime_status only
tells about runtime resume. So does ufshcd_suspend().

Thanks,

Can Guo.

> 
> Thanks,
> 
> Bart.