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bus: mhi: core: Use helper API to trigger a non-blocking host resume

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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.

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200929175218.8178-5-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bhaumik Bhatt 2020-09-29 23:22:03 +05:30 committed by Greg Kroah-Hartman
parent 515847c557
commit 8b53087cab
3 changed files with 18 additions and 23 deletions
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7
drivers/bus/mhi/core/internal.h
View File

@ -599,6 +599,13 @@ int __mhi_device_get_sync(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)
{
pm_wakeup_event(&mhi_cntrl->mhi_dev->dev, 0);
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);

21
drivers/bus/mhi/core/main.c
View File

@ -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);
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);
/* 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);
/* 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);
/* Toggle wake to exit out of M2 */
mhi_cntrl->wake_toggle(mhi_cntrl);

13
drivers/bus/mhi/core/pm.c
View File

@ -824,11 +824,8 @@ int __mhi_device_get_sync(struct mhi_controller *mhi_cntrl)
/* Wake up the device */
read_lock_bh(&mhi_cntrl->pm_lock);
mhi_cntrl->wake_get(mhi_cntrl, true);
if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state)) {
pm_wakeup_event(&mhi_cntrl->mhi_dev->dev, 0);
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);
read_unlock_bh(&mhi_cntrl->pm_lock);
ret = wait_event_timeout(mhi_cntrl->state_event,
@ -1139,10 +1136,8 @@ 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);
mhi_cntrl->wake_put(mhi_cntrl, false);
read_unlock_bh(&mhi_cntrl->pm_lock);