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authorBhaumik Bhatt <bbhatt@codeaurora.org>2020-09-29 23:22:03 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-10-02 11:33:46 +0200
commit8b53087cab61c3b309aaa9babf9a912d4dfd12c2 (patch)
tree306f5589ba37c04f1fa6709a1796ded724ca0187 /drivers/bus
parent515847c557dd33167be86cb429fc0674a331bc88 (diff)
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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. 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>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/mhi/core/internal.h7
-rw-r--r--drivers/bus/mhi/core/main.c21
-rw-r--r--drivers/bus/mhi/core/pm.c13
3 files changed, 18 insertions, 23 deletions
diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index bcfa7b6558ef..1bbd6e99d38d 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -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);
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index 1f622ce6be8b..79be18ec2ebf 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);
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);
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index 661d704c8093..b227d415e937 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -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);