| Message ID | 1622449813-3850-1-git-send-email-loic.poulain@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | bus: mhi: core: Resume success on SYS_ERR | expand |
On 2021-05-31 01:30 AM, Loic Poulain wrote: > When a crash occurs while in suspended state M3/D3hot, the host > only discovers SYS_ERR pm-state change on resume. Handle this > state as valid transition for resume procedure, giving a chance > to the MHI core to manage the state (sbl transition, etc...). > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> > --- > drivers/bus/mhi/core/pm.c | 21 ++++++++++++++++++++- > 1 file changed, 20 insertions(+), 1 deletion(-) > > diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c > index 704a5e2..e8eae4f 100644 > --- a/drivers/bus/mhi/core/pm.c > +++ b/drivers/bus/mhi/core/pm.c > @@ -898,8 +898,27 @@ int mhi_pm_resume(struct mhi_controller > *mhi_cntrl) > if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) > return -EIO; > > - if (mhi_get_mhi_state(mhi_cntrl) != MHI_STATE_M3) > + if (mhi_get_mhi_state(mhi_cntrl) == MHI_STATE_SYS_ERR) { > + /* If we are in SYS_ERR state, let MHI stack manages the error Nitpick: manage (instead of manages) > + * and resume successfully. > + */ > + dev_warn(dev, "Entered error while suspended\n"); > + > + write_lock_irq(&mhi_cntrl->pm_lock); > + cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_SYS_ERR_DETECT); > + write_unlock_irq(&mhi_cntrl->pm_lock); > + > + if (cur_state == MHI_PM_SYS_ERR_DETECT) { > + mhi_pm_sys_err_handler(mhi_cntrl); > + return 0; > + } > + } > + > + if (mhi_get_mhi_state(mhi_cntrl) != MHI_STATE_M3) { > + dev_warn(dev, "Is not in M3 state, resume failed %d\n", Maybe this log can be improved to say, "Resume failed. Current state: %d, expected M3.\n" > + mhi_get_mhi_state(mhi_cntrl)); > return -EINVAL; > + } > > /* Notify clients about exiting LPM */ > list_for_each_entry_safe(itr, tmp, &mhi_cntrl->lpm_chans, node) { We can add RDDM handling here as well since this hole exists in RDDM handling too. This means we can include the below within if (cur_state == MHI_PM_SYS_ERR_DETECT): if (mhi_cntrl->rddm_image && mhi_is_active(mhi_cntrl)) { mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_EE_RDDM); mhi_cntrl->ee = ee; wake_up_all(&mhi_cntrl->state_event); return 0; } It can be added in a separate patch as well following this one if you're fine with that. In its current state + nitpick addressed, you can add my: Reviewed-by: Bhaumik Bhatt <bbhatt@codeaurora.org> Thanks, Bhaumik --- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index 704a5e2..e8eae4f 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -898,8 +898,27 @@ int mhi_pm_resume(struct mhi_controller *mhi_cntrl) if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) return -EIO; - if (mhi_get_mhi_state(mhi_cntrl) != MHI_STATE_M3) + if (mhi_get_mhi_state(mhi_cntrl) == MHI_STATE_SYS_ERR) { + /* If we are in SYS_ERR state, let MHI stack manages the error + * and resume successfully. + */ + dev_warn(dev, "Entered error while suspended\n"); + + write_lock_irq(&mhi_cntrl->pm_lock); + cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_SYS_ERR_DETECT); + write_unlock_irq(&mhi_cntrl->pm_lock); + + if (cur_state == MHI_PM_SYS_ERR_DETECT) { + mhi_pm_sys_err_handler(mhi_cntrl); + return 0; + } + } + + if (mhi_get_mhi_state(mhi_cntrl) != MHI_STATE_M3) { + dev_warn(dev, "Is not in M3 state, resume failed %d\n", + mhi_get_mhi_state(mhi_cntrl)); return -EINVAL; + } /* Notify clients about exiting LPM */ list_for_each_entry_safe(itr, tmp, &mhi_cntrl->lpm_chans, node) {
When a crash occurs while in suspended state M3/D3hot, the host only discovers SYS_ERR pm-state change on resume. Handle this state as valid transition for resume procedure, giving a chance to the MHI core to manage the state (sbl transition, etc...). Signed-off-by: Loic Poulain <loic.poulain@linaro.org> --- drivers/bus/mhi/core/pm.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) -- 2.7.4