Re: [PATCH v4 02/10] scsi: ufs: Add flags pm_op_in_progress and is_sys_suspended

Hi Adrian,

On 2021-06-23 20:33, Adrian Hunter wrote:

On 23/06/21 10:35 am, Can Guo wrote:

quoted

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 <redacted>
---
 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.

quoted

@@ -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;