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Date:   Thu, 24 Jun 2021 10:05:47 +0800
From:   Can Guo <cang@codeaurora.org>
To:     Adrian Hunter <adrian.hunter@intel.com>
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>,
        Satya Tangirala <satyat@google.com>,
        Kiwoong Kim <kwmad.kim@samsung.com>,
        Bart Van Assche <bvanassche@acm.org>,
        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: <d9da89ac-cb40-d11b-5af3-5c948eb9b927@intel.com>
References: <1624433711-9339-1-git-send-email-cang@codeaurora.org>
 <1624433711-9339-3-git-send-email-cang@codeaurora.org>
 <d9da89ac-cb40-d11b-5af3-5c948eb9b927@intel.com>
Message-ID: <646da45daab10c264c4c8671744a07df@codeaurora.org>
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Hi Adrian,

On 2021-06-23 20:33, Adrian Hunter wrote:
> On 23/06/21 10:35 am, Can Guo wrote:
>> Add flags pm_op_in_progress and is_sys_suspended to track the status 
>> of hba
>> runtime and system suspend/resume operations.
>> 
>> Signed-off-by: Can Guo <cang@codeaurora.org>
>> ---
>>  drivers/scsi/ufs/ufshcd.c | 12 +++++++++++-
>>  drivers/scsi/ufs/ufshcd.h |  4 ++++
>>  2 files changed, 15 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index c40ba1d..abe5f2d 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -551,6 +551,8 @@ static void ufshcd_print_host_state(struct ufs_hba 
>> *hba)
>>  		hba->curr_dev_pwr_mode, hba->uic_link_state);
>>  	dev_err(hba->dev, "wlu_pm_op_in_progress=%d, 
>> is_wlu_sys_suspended=%d\n",
>>  		hba->wlu_pm_op_in_progress, hba->is_wlu_sys_suspended);
>> +	dev_err(hba->dev, "pm_op_in_progress=%d, is_sys_suspended=%d\n",
>> +		hba->pm_op_in_progress, hba->is_sys_suspended);
>>  	dev_err(hba->dev, "Auto BKOPS=%d, Host self-block=%d\n",
>>  		hba->auto_bkops_enabled, hba->host->host_self_blocked);
>>  	dev_err(hba->dev, "Clk gate=%d\n", hba->clk_gating.state);
>> @@ -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.
> 	 */
> 	ufshcd_disable_irq(hba);
> 	ret = ufshcd_setup_clocks(hba, false);
> 	if (ret) {
> 		ufshcd_enable_irq(hba);
> 
> Is "hba->pm_op_in_progress = false" needed here?
> 
> 		return ret;
> 	}
> 
> 

You are right, I missed it. Will add it in next ver. Thanks!

Regards,

Can Guo.

> 
>> @@ -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;
>>  }
>> 
>> @@ -9222,6 +9229,8 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
>>  	trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
>>  		ktime_to_us(ktime_sub(ktime_get(), start)),
>>  		hba->curr_dev_pwr_mode, hba->uic_link_state);
>> +	if (!ret)
>> +		hba->is_sys_suspended = true;
>>  	return ret;
>>  }
>>  EXPORT_SYMBOL(ufshcd_system_suspend);
>> @@ -9247,7 +9256,8 @@ int ufshcd_system_resume(struct ufs_hba *hba)
>>  	trace_ufshcd_system_resume(dev_name(hba->dev), ret,
>>  		ktime_to_us(ktime_sub(ktime_get(), start)),
>>  		hba->curr_dev_pwr_mode, hba->uic_link_state);
>> -
>> +	if (!ret)
>> +		hba->is_sys_suspended = false;
>>  	return ret;
>>  }
>>  EXPORT_SYMBOL(ufshcd_system_resume);
>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
>> index 93aeeb3..1e7fe73 100644
>> --- a/drivers/scsi/ufs/ufshcd.h
>> +++ b/drivers/scsi/ufs/ufshcd.h
>> @@ -754,6 +754,8 @@ struct ufs_hba {
>>  	struct device_attribute spm_lvl_attr;
>>  	/* A flag to tell whether __ufshcd_wl_suspend/resume() is in 
>> progress */
>>  	bool wlu_pm_op_in_progress;
>> +	/* A flag to tell whether ufshcd_suspend/resume() is in progress */
>> +	bool pm_op_in_progress;
>> 
>>  	/* Auto-Hibernate Idle Timer register value */
>>  	u32 ahit;
>> @@ -841,6 +843,8 @@ struct ufs_hba {
>>  	struct ufs_clk_scaling clk_scaling;
>>  	/* A flag to tell whether the UFS device W-LU is system suspended */
>>  	bool is_wlu_sys_suspended;
>> +	/* A flag to tell whether hba is system suspended */
>> +	bool is_sys_suspended;
>> 
>>  	enum bkops_status urgent_bkops_lvl;
>>  	bool is_urgent_bkops_lvl_checked;
>>