Re: [PATCH v1] remoteproc: core: do pm relax when not first crash

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On 9/17/2022 1:05 AM, Mathieu Poirier wrote:
On Tue, 13 Sept 2022 at 05:03, Aiqun(Maria) Yu <quic_aiquny@xxxxxxxxxxx> wrote:

Hi Mathieu,

pm_awake and pm_relax needed to be used as a pair. There is chance that
pm_relax is not being called, and make the device always in cannot
suspend state.

On 9/10/2022 3:23 AM, Mathieu Poirier wrote:
Hi Maria,

On Fri, Sep 09, 2022 at 04:33:33PM +0800, Maria Yu wrote:
Even if it is not first crash, need to relax the pm
wakelock otherwise the device will stay awake.


The goal is exactly to keep the device awake...

Signed-off-by: Maria Yu <quic_aiquny@xxxxxxxxxxx>
---
   drivers/remoteproc/remoteproc_core.c | 1 +
   1 file changed, 1 insertion(+)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index e5279ed9a8d7..30078043e939 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1956,6 +1956,7 @@ static void rproc_crash_handler_work(struct work_struct *work)
      if (rproc->state == RPROC_CRASHED || rproc->state == RPROC_OFFLINE) {
              /* handle only the first crash detected */
              mutex_unlock(&rproc->lock);
+            pm_relax(rproc->dev.parent);

If we are here it means that rproc_crash_handler_work() has already been called
_and_ that a recovery is in process.  When the first crash handler completes
pm_relax() will be called and the device will go to sleep as expected.
If the rproc->state cannot be changed to running state, the device will
always be awake from this return.
Also APROC_OFFLINE state can be given in other path like an shutdown
request is issued.

While this patch is not considering carefully as well, I think I need to
upload a new patchset with an ordered workqueue to make each work have
each pm_relax before return.
what do you think?

I was travelling this week and as such did not have the time to
follow-up with this thread, something I will do next week.

Thx for follow up. I have new patchset posted on this thread.
After reconsideration, extra action can be done only for RPROC_OFFLINE state. Pls check the newest v4 patchset on this thread.


Thanks,
Mathieu

              return;
      }

--
2.7.4



--
Thx and BRs,
Aiqun(Maria) Yu


--
Thx and BRs,
Aiqun(Maria) Yu



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