github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-31 11:37:06 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

bus: mhi: host: Add RDDM check in mhi_pm_resume()

Browse Source 
If a device crash occurs when in suspended state, the interrupt
handler cannot access registers to act on it. Once controller is
done with PCIe resume and calls mhi_pm_resume(), MHI host can
check for the RDDM entry and handle it as needed.

Change-Id: I6127b75b51c3ef932e601391daebd0657e1a04eb
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Signed-off-by: Lazarus Motha <quic_lmotha@quicinc.com>
This commit is contained in:
Bhaumik Bhatt 2021-10-13 12:51:30 -07:00 committed by Gerrit - the friendly Code Review server
parent d0737d448d
commit 38dced66d3
1 changed files with 27 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/bus/mhi/host/pm.c
View File

@ -820,6 +820,28 @@ void mhi_pm_st_worker(struct work_struct *work)
}
}
static bool mhi_in_rddm(struct mhi_controller *mhi_cntrl)
{
struct device *dev = &mhi_cntrl->mhi_dev->dev;
if (mhi_cntrl->rddm_image && mhi_get_exec_env(mhi_cntrl) == MHI_EE_RDDM
&& mhi_is_active(mhi_cntrl)) {
mhi_cntrl->ee = MHI_EE_RDDM;
MHI_ERR(dev, "RDDM event occurred!\n");
/* notify critical clients with early notifications */
mhi_report_error(mhi_cntrl);
mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_EE_RDDM);
wake_up_all(&mhi_cntrl->state_event);
return true;
}
return false;
}
int mhi_pm_suspend(struct mhi_controller *mhi_cntrl)
{
struct mhi_chan *itr, *tmp;
@ -935,6 +957,9 @@ static int __mhi_pm_resume(struct mhi_controller *mhi_cntrl, bool force)
if (mhi_get_mhi_state(mhi_cntrl) != MHI_STATE_M3)
panic("mhi_pm_state != M3");
if (mhi_in_rddm(mhi_cntrl))
return 0;
/* Notify clients about exiting LPM */
list_for_each_entry_safe(itr, tmp, &mhi_cntrl->lpm_chans, node) {
mutex_lock(&itr->mutex);
@ -965,6 +990,8 @@ static int __mhi_pm_resume(struct mhi_controller *mhi_cntrl, bool force)
msecs_to_jiffies(mhi_cntrl->timeout_ms));
if (!ret || MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) {
if (mhi_in_rddm(mhi_cntrl))
return 0;
dev_err(dev,
"Did not enter M0 state, MHI state: %s, PM state: %s\n",
mhi_state_str(mhi_cntrl->dev_state),