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Commit 7978e38f authored by Sujeev Dias's avatar Sujeev Dias Committed by Gerrit - the friendly Code Review server
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mhi: core: add support to trigger modem into RDDM mode 



RDDM mode (ramdump mode) allows host to collect external modem
ramdump for debugging purpose.

CRs-Fixed: 2220997
Change-Id: I88c38198f150716a3e997cdd424b19b7576aca20
Signed-off-by: default avatarSujeev Dias <sdias@codeaurora.org>
parent fd523541

drivers/bus/mhi/core/mhi_pm.c

+71 −15
Original line number Diff line number Diff line
@@ -1065,23 +1065,10 @@ int mhi_pm_resume(struct mhi_controller *mhi_cntrl) 
	return 0;

}



void mhi_device_get(struct mhi_device *mhi_dev)

static int __mhi_device_get_sync(struct mhi_controller *mhi_cntrl)

{

	struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;



	atomic_inc(&mhi_dev->dev_wake);

	read_lock_bh(&mhi_cntrl->pm_lock);

	mhi_cntrl->wake_get(mhi_cntrl, false);

	read_unlock_bh(&mhi_cntrl->pm_lock);

}

EXPORT_SYMBOL(mhi_device_get);



int mhi_device_get_sync(struct mhi_device *mhi_dev)

{

	struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;

	int ret;



	atomic_inc(&mhi_dev->dev_wake);

	read_lock_bh(&mhi_cntrl->pm_lock);

	mhi_cntrl->wake_get(mhi_cntrl, false);

	if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state)) {
@@ -1099,7 +1086,6 @@ int mhi_device_get_sync(struct mhi_device *mhi_dev) 
		MHI_ERR("Did not enter M0 state, cur_state:%s pm_state:%s\n",

			TO_MHI_STATE_STR(mhi_cntrl->dev_state),

			to_mhi_pm_state_str(mhi_cntrl->pm_state));

		atomic_dec(&mhi_dev->dev_wake);

		read_lock_bh(&mhi_cntrl->pm_lock);

		mhi_cntrl->wake_put(mhi_cntrl, false);

		read_unlock_bh(&mhi_cntrl->pm_lock);
@@ -1108,6 +1094,29 @@ int mhi_device_get_sync(struct mhi_device *mhi_dev) 


	return 0;

}



void mhi_device_get(struct mhi_device *mhi_dev)

{

	struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;



	atomic_inc(&mhi_dev->dev_wake);

	read_lock_bh(&mhi_cntrl->pm_lock);

	mhi_cntrl->wake_get(mhi_cntrl, false);

	read_unlock_bh(&mhi_cntrl->pm_lock);

}

EXPORT_SYMBOL(mhi_device_get);



int mhi_device_get_sync(struct mhi_device *mhi_dev)

{

	struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;

	int ret;



	ret = __mhi_device_get_sync(mhi_cntrl);

	if (!ret)

		atomic_inc(&mhi_dev->dev_wake);



	return ret;

}

EXPORT_SYMBOL(mhi_device_get_sync);



void mhi_device_put(struct mhi_device *mhi_dev)
@@ -1120,3 +1129,50 @@ void mhi_device_put(struct mhi_device *mhi_dev) 
	read_unlock_bh(&mhi_cntrl->pm_lock);

}

EXPORT_SYMBOL(mhi_device_put);



int mhi_force_rddm_mode(struct mhi_controller *mhi_cntrl)

{

	int ret;



	MHI_LOG("Enter with pm_state:%s ee:%s\n",

		to_mhi_pm_state_str(mhi_cntrl->pm_state),

		TO_MHI_EXEC_STR(mhi_cntrl->ee));



	/* before rddm mode, we need to enter M0 state */

	ret = __mhi_device_get_sync(mhi_cntrl);

	if (ret)

		return ret;



	mutex_lock(&mhi_cntrl->pm_mutex);

	write_lock_irq(&mhi_cntrl->pm_lock);

	if (!MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state))

		goto no_reg_access;



	MHI_LOG("Triggering SYS_ERR to force rddm state\n");



	mhi_set_mhi_state(mhi_cntrl, MHI_STATE_SYS_ERR);

	mhi_cntrl->wake_put(mhi_cntrl, false);

	write_unlock_irq(&mhi_cntrl->pm_lock);

	mutex_unlock(&mhi_cntrl->pm_mutex);



	/* wait for rddm event */

	MHI_LOG("Waiting for device to enter RDDM state\n");

	ret = wait_event_timeout(mhi_cntrl->state_event,

				 mhi_cntrl->ee == MHI_EE_RDDM,

				 msecs_to_jiffies(mhi_cntrl->timeout_ms));

	ret = !ret ? 0 : -EIO;



	MHI_LOG("Exiting with pm_state:%s ee:%s ret:%d\n",

		to_mhi_pm_state_str(mhi_cntrl->pm_state),

		TO_MHI_EXEC_STR(mhi_cntrl->ee), ret);



	return ret;



no_reg_access:

	mhi_cntrl->wake_put(mhi_cntrl, false);

	write_unlock_irq(&mhi_cntrl->pm_lock);

	mutex_unlock(&mhi_cntrl->pm_mutex);



	return -EIO;

}

EXPORT_SYMBOL(mhi_force_rddm_mode);

include/linux/mhi.h

+13 −0
Original line number Diff line number Diff line
@@ -519,6 +519,14 @@ int mhi_pm_resume(struct mhi_controller *mhi_cntrl); 
 */

int mhi_download_rddm_img(struct mhi_controller *mhi_cntrl, bool in_panic);



/**

 * mhi_force_rddm_mode - Force external device into rddm mode

 * to collect device ramdump. This is useful if host driver assert

 * and we need to see device state as well.

 * @mhi_cntrl: MHI controller

 */

int mhi_force_rddm_mode(struct mhi_controller *mhi_cntrl);



#else



static inline int mhi_driver_register(struct mhi_driver *mhi_drv)
@@ -643,6 +651,11 @@ static inline int mhi_download_rddm_img(struct mhi_controller *mhi_cntrl, 
	return -EINVAL;

}



static inlint int mhi_force_rddm_mode(struct mhi_controller *mhi_cntrl)

{

	return -EINVAL;

}



#endif



#ifndef CONFIG_ARCH_QCOM