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Date:   Mon, 28 Jun 2021 15:11:45 +0800
From:   Can Guo <cang@codeaurora.org>
To:     Bart Van Assche <bvanassche@acm.org>
Cc:     asutoshd@codeaurora.org, nguyenb@codeaurora.org,
        hongwus@codeaurora.org, ziqichen@codeaurora.org,
        linux-scsi@vger.kernel.org, kernel-team@android.com,
        Alim Akhtar <alim.akhtar@samsung.com>,
        Avri Altman <avri.altman@wdc.com>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Stanley Chu <stanley.chu@mediatek.com>,
        Bean Huo <beanhuo@micron.com>,
        Jaegeuk Kim <jaegeuk@kernel.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Satya Tangirala <satyat@google.com>,
        Kiwoong Kim <kwmad.kim@samsung.com>,
        open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 02/10] scsi: ufs: Add flags pm_op_in_progress and
 is_sys_suspended
In-Reply-To: <77b92c6e-2e1c-c799-f6ac-04467175f96a@acm.org>
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 <1624433711-9339-3-git-send-email-cang@codeaurora.org>
 <77b92c6e-2e1c-c799-f6ac-04467175f96a@acm.org>
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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.