linux-kernel - [PATCH v4 3/9] bus: mhi: core: Use helper API to trigger a non-blocking host resume

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Message-Id: <1593448782-8385-4-git-send-email-bbhatt@codeaurora.org>
Date:   Mon, 29 Jun 2020 09:39:36 -0700
From:   Bhaumik Bhatt <bbhatt@...eaurora.org>
To:     manivannan.sadhasivam@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        jhugo@...eaurora.org, linux-kernel@...r.kernel.org,
        Bhaumik Bhatt <bbhatt@...eaurora.org>
Subject: [PATCH v4 3/9] bus: mhi: core: Use helper API to trigger a non-blocking host resume

Autonomous low power mode support requires the MHI host to resume from
multiple places and post a wakeup source to exit system suspend. This
needs to be done in a non-blocking manner. Introduce a helper API to
trigger the host resume for data transfers and other non-blocking use
cases while supporting implementation of autonomous low power modes.

Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
---
 drivers/bus/mhi/core/internal.h |  8 ++++++++
 drivers/bus/mhi/core/main.c     | 21 +++++++--------------
 drivers/bus/mhi/core/pm.c       |  6 ++----
 3 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index bcfa7b6..cb32eaf 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -599,6 +599,14 @@ int mhi_queue_state_transition(struct mhi_controller *mhi_cntrl,
 int mhi_send_cmd(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan,
 		 enum mhi_cmd_type cmd);
 
+static inline void mhi_trigger_resume(struct mhi_controller *mhi_cntrl,
+				      bool hard_wakeup)
+{
+	pm_wakeup_dev_event(&mhi_cntrl->mhi_dev->dev, 0, hard_wakeup);
+	mhi_cntrl->runtime_get(mhi_cntrl);
+	mhi_cntrl->runtime_put(mhi_cntrl);
+}
+
 /* Register access methods */
 void mhi_db_brstmode(struct mhi_controller *mhi_cntrl, struct db_cfg *db_cfg,
 		     void __iomem *db_addr, dma_addr_t db_val);
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index 1f622ce..8d6ec34 100644
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -909,8 +909,7 @@ void mhi_ctrl_ev_task(unsigned long data)
 		 * process it since we are probably in a suspended state,
 		 * so trigger a resume.
 		 */
-		mhi_cntrl->runtime_get(mhi_cntrl);
-		mhi_cntrl->runtime_put(mhi_cntrl);
+		mhi_trigger_resume(mhi_cntrl, false);
 
 		return;
 	}
@@ -971,10 +970,8 @@ int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir,
 	}
 
 	/* we're in M3 or transitioning to M3 */
-	if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state)) {
-		mhi_cntrl->runtime_get(mhi_cntrl);
-		mhi_cntrl->runtime_put(mhi_cntrl);
-	}
+	if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state))
+		mhi_trigger_resume(mhi_cntrl, false);
 
 	/* Toggle wake to exit out of M2 */
 	mhi_cntrl->wake_toggle(mhi_cntrl);
@@ -1032,10 +1029,8 @@ int mhi_queue_dma(struct mhi_device *mhi_dev, enum dma_data_direction dir,
 	}
 
 	/* we're in M3 or transitioning to M3 */
-	if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state)) {
-		mhi_cntrl->runtime_get(mhi_cntrl);
-		mhi_cntrl->runtime_put(mhi_cntrl);
-	}
+	if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state))
+		mhi_trigger_resume(mhi_cntrl, false);
 
 	/* Toggle wake to exit out of M2 */
 	mhi_cntrl->wake_toggle(mhi_cntrl);
@@ -1147,10 +1142,8 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir,
 	read_lock_irqsave(&mhi_cntrl->pm_lock, flags);
 
 	/* we're in M3 or transitioning to M3 */
-	if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state)) {
-		mhi_cntrl->runtime_get(mhi_cntrl);
-		mhi_cntrl->runtime_put(mhi_cntrl);
-	}
+	if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state))
+		mhi_trigger_resume(mhi_cntrl, false);
 
 	/* Toggle wake to exit out of M2 */
 	mhi_cntrl->wake_toggle(mhi_cntrl);
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index 661d704..5e3994e 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -1139,10 +1139,8 @@ void mhi_device_put(struct mhi_device *mhi_dev)
 
 	mhi_dev->dev_wake--;
 	read_lock_bh(&mhi_cntrl->pm_lock);
-	if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state)) {
-		mhi_cntrl->runtime_get(mhi_cntrl);
-		mhi_cntrl->runtime_put(mhi_cntrl);
-	}
+	if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state))
+		mhi_trigger_resume(mhi_cntrl, false);
 
 	mhi_cntrl->wake_put(mhi_cntrl, false);
 	read_unlock_bh(&mhi_cntrl->pm_lock);
-- 
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