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Commit 35f6b97e authored by Siddartha Mohanadoss's avatar Siddartha Mohanadoss
Browse files

msm: mhi_dev: Hold a wakelock during data transfer 



Modem host interface (MHI) device supports software
channel data transfers. Hold a wakelock if MHI device
is in active state and host has not placed the device
in suspend.

Change-Id: I5000e8b9c6761c6f662ee01d557b78bc16fe1632
Signed-off-by: default avatarSiddartha Mohanadoss <smohanad@codeaurora.org>
parent 998e5be1

drivers/platform/msm/mhi_dev/mhi.c

+20 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/msm_ep_pcie.h>

#include <linux/ipa_mhi.h>

#include <linux/vmalloc.h>

#include <linux/wakelock.h>



#include "mhi.h"

#include "mhi_hwio.h"
@@ -1129,6 +1130,13 @@ static void mhi_dev_scheduler(struct work_struct *work) 


void mhi_dev_notify_a7_event(struct mhi_dev *mhi)

{



	if (!atomic_read(&mhi->mhi_dev_wake)) {

		pm_stay_awake(mhi->dev);

		atomic_set(&mhi->mhi_dev_wake, 1);

	}

	mhi_log(MHI_MSG_VERBOSE, "acquiring mhi wakelock\n");



	schedule_work(&mhi->chdb_ctrl_work);

	mhi_log(MHI_MSG_VERBOSE, "mhi irq triggered\n");

}
@@ -1368,6 +1376,10 @@ int mhi_dev_suspend(struct mhi_dev *mhi) 


	}



	atomic_set(&mhi->mhi_dev_wake, 0);

	pm_relax(mhi->dev);

	mhi_log(MHI_MSG_VERBOSE, "releasing mhi wakelock\n");



	mutex_unlock(&mhi_ctx->mhi_write_test);



	return rc;
@@ -2028,6 +2040,14 @@ static int get_device_tree_data(struct platform_device *pdev) 
		}

	}



	device_init_wakeup(mhi->dev, true);

	/* MHI device will be woken up from PCIe event */

	device_set_wakeup_capable(mhi->dev, false);

	/* Hold a wakelock until completion of M0 */

	pm_stay_awake(mhi->dev);

	atomic_set(&mhi->mhi_dev_wake, 1);



	mhi_log(MHI_MSG_VERBOSE, "acquiring wakelock\n");



	return 0;

}

drivers/platform/msm/mhi_dev/mhi.h

+1 −0
Original line number Diff line number Diff line
@@ -519,6 +519,7 @@ struct mhi_dev { 


	atomic_t			write_active;

	atomic_t			is_suspended;

	atomic_t			mhi_dev_wake;

	struct mutex			mhi_write_test;

	u32				device_local_pa_base;

	u32				mhi_ep_msi_num;