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

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Date:   Wed, 23 Jun 2021 00:35:01 -0700
From:   Can Guo <cang@...eaurora.org>
To:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, ziqichen@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        cang@...eaurora.org
Cc:     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>,
        Bart Van Assche <bvanassche@....org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v4 02/10] scsi: ufs: Add flags pm_op_in_progress and is_sys_suspended

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@...eaurora.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.
@@ -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;
-- 
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