Re: [PATCH v4 10/12] bus: mhi: core: Separate system error and power down handling
On Mon, Nov 09, 2020 at 12:47:29PM -0800, Bhaumik Bhatt wrote:
> Currently, there exist a set of if...else statements in the
> mhi_pm_disable_transition() function which make handling system
> error and disable transitions differently complex. To make that
> cleaner and facilitate differences in behavior, separate these
> two transitions for MHI host.
>
> Signed-off-by: Bhaumik Bhatt
Reviewed-by: Manivannan Sadhasivam
Thanks,
Mani
> ---
> drivers/bus/mhi/core/pm.c | 159
> +++---
> 1 file changed, 137 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index 1d04e401..347ae7d 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -444,7 +444,7 @@ static int mhi_pm_mission_mode_transition(struct
> mhi_controller *mhi_cntrl)
> return ret;
> }
>
> -/* Handle SYS_ERR and Shutdown transitions */
> +/* Handle shutdown transitions */
> static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl,
> enum mhi_pm_state transition_state)
> {
> @@ -460,10 +460,6 @@ static void mhi_pm_disable_transition(struct
> mhi_controller *mhi_cntrl,
> to_mhi_pm_state_str(mhi_cntrl->pm_state),
> to_mhi_pm_state_str(transition_state));
>
> - /* We must notify MHI control driver so it can clean up first */
> - if (transition_state == MHI_PM_SYS_ERR_PROCESS)
> - mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_SYS_ERROR);
> -
> mutex_lock(_cntrl->pm_mutex);
> write_lock_irq(_cntrl->pm_lock);
> prev_state = mhi_cntrl->pm_state;
> @@ -502,11 +498,8 @@ static void mhi_pm_disable_transition(struct
> mhi_controller *mhi_cntrl,
> MHICTRL_RESET_SHIFT,
> _reset) ||
> !in_reset, timeout);
> - if ((!ret || in_reset) && cur_state == MHI_PM_SYS_ERR_PROCESS) {
> + if (!ret || in_reset)
> dev_err(dev, "Device failed to exit MHI Reset state\n");
> - mutex_unlock(_cntrl->pm_mutex);
> - return;
> - }
>
> /*
>* Device will clear BHI_INTVEC as a part of RESET processing,
> @@ -566,19 +559,142 @@ static void mhi_pm_disable_transition(struct
> mhi_controller *mhi_cntrl,
> er_ctxt->wp = er_ctxt->rbase;
> }
>
> - if (cur_state == MHI_PM_SYS_ERR_PROCESS) {
> - mhi_ready_state_transition(mhi_cntrl);
> - } else {
> - /* Move to disable state */
> - write_lock_irq(_cntrl->pm_lock);
> - cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_DISABLE);
> - write_unlock_irq(_cntrl->pm_lock);
> - if (unlikely(cur_state != MHI_PM_DISABLE))
> - dev_err(dev, "Error moving from PM state: %s to: %s\n",
> - to_mhi_pm_state_str(cur_state),
> - to_mhi_pm_state_str(MHI_PM_DISABLE));
> + /* Move to disable state */
> + write_lock_irq(_cntrl->pm_lock);
> + cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_DISABLE);
> + write_unlock_irq(_cntrl->pm_lock);
> + if (unlikely(cur_state != MHI_PM_DISABLE))
> + dev_err(dev, "Error moving from PM state: %s to: %s\n",
> + to_mhi_pm_state_str(cur_state),
> + to_mhi_pm_state_str(MHI_PM_DISABLE));
> +
> + dev_dbg(dev, "Exiting with PM state: %s, MHI state: %s\n",
> + to_mhi_pm_state_str(mhi_cntrl->pm_state),
> + TO_MHI_STATE_STR(mhi_cntrl->dev_state));
> +
> + mutex_unlock(_cntrl->pm_mutex);
> +}
> +
> +/* Handle system error transitions */
> +static void mhi_pm_sys_error_transition(struct mhi_controller *mhi_cntrl)
> +{
> + enum mhi_pm_state cur_state, prev_state;
> + struct mhi_event *mhi_event;
> + struct mhi_cmd_ctxt *cmd_ctxt;
> + struct mhi_cmd *mhi_cmd;
> + struct mhi_event_ctxt *er_ctxt;
> + struct device *dev = _cntrl->mhi_dev->dev;
> + int ret, i;
> +
> + dev_dbg(dev, "Transitioning from PM state: %s to: %s\n",
> + to_mhi_pm_state_str(mhi_cntrl->pm_state),
> + to_mhi_pm_state_str(MHI_PM_SYS_ERR_PROCESS));
> +
> + /* We must notify MHI control driver so it can clean up first */
> + mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_SYS_ERROR);
> +
> + mutex_lock(_cntrl->pm_mutex);
> + write_lock_irq(_cntrl->pm_lock);
> + prev_state = mhi_cntrl->pm_state;
> + cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_SYS_ERR_PROCESS);
> + write_unlock_irq(_cntrl->pm_lock);
> +
> + if (cur_state != MHI_PM_SYS_ERR_PROCESS) {
> + dev_err(dev, "Failed to transition from PM state: %s to: %s\n",
> + to_mhi_pm_state_str(cur_state),
> +
[PATCH v4 10/12] bus: mhi: core: Separate system error and power down handling
Currently, there exist a set of if...else statements in the
mhi_pm_disable_transition() function which make handling system
error and disable transitions differently complex. To make that
cleaner and facilitate differences in behavior, separate these
two transitions for MHI host.
Signed-off-by: Bhaumik Bhatt
---
drivers/bus/mhi/core/pm.c | 159 +++---
1 file changed, 137 insertions(+), 22 deletions(-)
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index 1d04e401..347ae7d 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -444,7 +444,7 @@ static int mhi_pm_mission_mode_transition(struct
mhi_controller *mhi_cntrl)
return ret;
}
-/* Handle SYS_ERR and Shutdown transitions */
+/* Handle shutdown transitions */
static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl,
enum mhi_pm_state transition_state)
{
@@ -460,10 +460,6 @@ static void mhi_pm_disable_transition(struct
mhi_controller *mhi_cntrl,
to_mhi_pm_state_str(mhi_cntrl->pm_state),
to_mhi_pm_state_str(transition_state));
- /* We must notify MHI control driver so it can clean up first */
- if (transition_state == MHI_PM_SYS_ERR_PROCESS)
- mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_SYS_ERROR);
-
mutex_lock(_cntrl->pm_mutex);
write_lock_irq(_cntrl->pm_lock);
prev_state = mhi_cntrl->pm_state;
@@ -502,11 +498,8 @@ static void mhi_pm_disable_transition(struct
mhi_controller *mhi_cntrl,
MHICTRL_RESET_SHIFT,
_reset) ||
!in_reset, timeout);
- if ((!ret || in_reset) && cur_state == MHI_PM_SYS_ERR_PROCESS) {
+ if (!ret || in_reset)
dev_err(dev, "Device failed to exit MHI Reset state\n");
- mutex_unlock(_cntrl->pm_mutex);
- return;
- }
/*
* Device will clear BHI_INTVEC as a part of RESET processing,
@@ -566,19 +559,142 @@ static void mhi_pm_disable_transition(struct
mhi_controller *mhi_cntrl,
er_ctxt->wp = er_ctxt->rbase;
}
- if (cur_state == MHI_PM_SYS_ERR_PROCESS) {
- mhi_ready_state_transition(mhi_cntrl);
- } else {
- /* Move to disable state */
- write_lock_irq(_cntrl->pm_lock);
- cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_DISABLE);
- write_unlock_irq(_cntrl->pm_lock);
- if (unlikely(cur_state != MHI_PM_DISABLE))
- dev_err(dev, "Error moving from PM state: %s to: %s\n",
- to_mhi_pm_state_str(cur_state),
- to_mhi_pm_state_str(MHI_PM_DISABLE));
+ /* Move to disable state */
+ write_lock_irq(_cntrl->pm_lock);
+ cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_DISABLE);
+ write_unlock_irq(_cntrl->pm_lock);
+ if (unlikely(cur_state != MHI_PM_DISABLE))
+ dev_err(dev, "Error moving from PM state: %s to: %s\n",
+ to_mhi_pm_state_str(cur_state),
+ to_mhi_pm_state_str(MHI_PM_DISABLE));
+
+ dev_dbg(dev, "Exiting with PM state: %s, MHI state: %s\n",
+ to_mhi_pm_state_str(mhi_cntrl->pm_state),
+ TO_MHI_STATE_STR(mhi_cntrl->dev_state));
+
+ mutex_unlock(_cntrl->pm_mutex);
+}
+
+/* Handle system error transitions */
+static void mhi_pm_sys_error_transition(struct mhi_controller *mhi_cntrl)
+{
+ enum mhi_pm_state cur_state, prev_state;
+ struct mhi_event *mhi_event;
+ struct mhi_cmd_ctxt *cmd_ctxt;
+ struct mhi_cmd *mhi_cmd;
+ struct mhi_event_ctxt *er_ctxt;
+ struct device *dev = _cntrl->mhi_dev->dev;
+ int ret, i;
+
+ dev_dbg(dev, "Transitioning from PM state: %s to: %s\n",
+ to_mhi_pm_state_str(mhi_cntrl->pm_state),
+ to_mhi_pm_state_str(MHI_PM_SYS_ERR_PROCESS));
+
+ /* We must notify MHI control driver so it can clean up first */
+ mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_SYS_ERROR);
+
+ mutex_lock(_cntrl->pm_mutex);
+ write_lock_irq(_cntrl->pm_lock);
+ prev_state = mhi_cntrl->pm_state;
+ cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_SYS_ERR_PROCESS);
+ write_unlock_irq(_cntrl->pm_lock);
+
+ if (cur_state != MHI_PM_SYS_ERR_PROCESS) {
+ dev_err(dev, "Failed to transition from PM state: %s to: %s\n",
+ to_mhi_pm_state_str(cur_state),
+ to_mhi_pm_state_str(MHI_PM_SYS_ERR_PROCESS));
+ goto exit_sys_error_transition;
+ }
+
+ mhi_cntrl->ee = MHI_EE_DISABLE_TRANSITION;
+ mhi_cntrl->dev_state =
