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From: Bhaumik Bhatt <bbhatt@codeaurora.org>
To: manivannan.sadhasivam@linaro.org
Cc: linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org,
	jhugo@codeaurora.org, linux-kernel@vger.kernel.org,
	Bhaumik Bhatt <bbhatt@codeaurora.org>
Subject: [PATCH v5 08/10] bus: mhi: core: Use counters to track MHI device state transitions
Date: Thu, 23 Jul 2020 15:36:40 -0700	[thread overview]
Message-ID: <1595543802-17859-9-git-send-email-bbhatt@codeaurora.org> (raw)
In-Reply-To: <1595543802-17859-1-git-send-email-bbhatt@codeaurora.org>

Use counters to track MHI device state transitions such as those
to M0, M2, or M3 states. This helps in better debug by allowing
the user to see the number of transitions to a certain state when
queried using the states debugfs entry.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
---
 drivers/bus/mhi/core/pm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index 27bb471..ce4d969 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -256,6 +256,7 @@ int mhi_pm_m0_transition(struct mhi_controller *mhi_cntrl)
 		dev_err(dev, "Unable to transition to M0 state\n");
 		return -EIO;
 	}
+	mhi_cntrl->M0++;
 
 	/* Wake up the device */
 	read_lock_bh(&mhi_cntrl->pm_lock);
@@ -326,6 +327,8 @@ void mhi_pm_m1_transition(struct mhi_controller *mhi_cntrl)
 		mhi_cntrl->dev_state = MHI_STATE_M2;
 
 		write_unlock_irq(&mhi_cntrl->pm_lock);
+
+		mhi_cntrl->M2++;
 		wake_up_all(&mhi_cntrl->state_event);
 
 		/* If there are any pending resources, exit M2 immediately */
@@ -362,6 +365,7 @@ int mhi_pm_m3_transition(struct mhi_controller *mhi_cntrl)
 		return -EIO;
 	}
 
+	mhi_cntrl->M3++;
 	wake_up_all(&mhi_cntrl->state_event);
 
 	return 0;
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


  parent reply	other threads:[~2020-07-23 22:37 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-23 22:36 [PATCH v5 00/10] Introduce features and debugfs/sysfs entries for MHI Bhaumik Bhatt
2020-07-23 22:36 ` [PATCH v5 01/10] bus: mhi: core: Remove double occurrence for mhi_ctrl_ev_task() declaration Bhaumik Bhatt
2020-07-23 22:36 ` [PATCH v5 02/10] bus: mhi: core: Abort suspends due to outgoing pending packets Bhaumik Bhatt
2020-07-23 22:36 ` [PATCH v5 03/10] bus: mhi: core: Use helper API to trigger a non-blocking host resume Bhaumik Bhatt
2020-07-24  6:09   ` Manivannan Sadhasivam
2020-07-23 22:36 ` [PATCH v5 04/10] bus: mhi: core: Trigger host resume if suspended during mhi_device_get() Bhaumik Bhatt
2020-07-23 22:36 ` [PATCH v5 05/10] bus: mhi: core: Use generic name field for an MHI device Bhaumik Bhatt
2020-07-23 22:36 ` [PATCH v5 06/10] bus: mhi: core: Introduce helper function to check device state Bhaumik Bhatt
2020-07-23 22:36 ` [PATCH v5 07/10] bus: mhi: core: Introduce debugfs entries for MHI Bhaumik Bhatt
2020-07-24  4:11   ` kernel test robot
2020-07-24 23:46   ` kernel test robot
2020-07-23 22:36 ` Bhaumik Bhatt [this message]
2020-07-24  5:24   ` [PATCH v5 08/10] bus: mhi: core: Use counters to track MHI device state transitions Manivannan Sadhasivam
2020-07-23 22:36 ` [PATCH v5 09/10] bus: mhi: core: Read and save device hardware information from BHI Bhaumik Bhatt
2020-07-23 22:36 ` [PATCH v5 10/10] bus: mhi: core: Introduce sysfs entries for MHI Bhaumik Bhatt
2020-07-24  5:42   ` Manivannan Sadhasivam
2020-07-28  0:29     ` bbhatt

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