On Mon 22 Jun 00:07 PDT 2020, Bjorn Andersson wrote:
> On Mon 01 Jun 10:51 PDT 2020, Mathieu Poirier wrote:
>
> > Introducing function rproc_attach() to enact the same actions as
> > rproc_start(), but without the steps related to the handling of
> > a firmware image. That way we can properly deal with scenarios
> > where the remoteproc core needs to attach with a remote processsor
> > that has been booted by another entity.
> >
> > Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
> > ---
> > drivers/remoteproc/remoteproc_core.c | 42 ++++++++++++++++++++++++++++
> > 1 file changed, 42 insertions(+)
> >
> > diff --git a/drivers/remoteproc/remoteproc_core.c
> > b/drivers/remoteproc/remoteproc_core.c
> > index 9f04c30c4aaf..0b323f6b554b 100644
> > --- a/drivers/remoteproc/remoteproc_core.c
> > +++ b/drivers/remoteproc/remoteproc_core.c
> > @@ -1370,6 +1370,48 @@ static int rproc_start(struct rproc *rproc, const
> > struct firmware *fw)
> > return ret;
> > }
> >
> > +static int __maybe_unused rproc_attach(struct rproc *rproc)
> > +{
> > + struct device *dev = &rproc->dev;
> > + int ret;
> > +
>
> For the case where we're going DETACHED -> RUNNING - > OFFLINE we
> need to consider the pm_runtime (and prepare/unprepare) state of the
> device as well...
>
Missed that you do indeed pm_runtime_get() in the calling function, so I
think we're good on that part. Still need how to actually implement
that (and the prepare/unprepare), in particular if we're moving into
detaching a remoteproc.
>
> Apart from that I think this looks good.
>
Reviewed-by: Bjorn Andersson <bjorn.anders...@linaro.org>
Regards,
Bjorn
> Regards,
> Bjorn
>
> > + ret = rproc_prepare_subdevices(rproc);
> > + if (ret) {
> > + dev_err(dev, "failed to prepare subdevices for %s: %d\n",
> > + rproc->name, ret);
> > + goto out;
> > + }
> > +
> > + /* Attach to the remote processor */
> > + ret = rproc_attach_device(rproc);
> > + if (ret) {
> > + dev_err(dev, "can't attach to rproc %s: %d\n",
> > + rproc->name, ret);
> > + goto unprepare_subdevices;
> > + }
> > +
> > + /* Start any subdevices for the remote processor */
> > + ret = rproc_start_subdevices(rproc);
> > + if (ret) {
> > + dev_err(dev, "failed to probe subdevices for %s: %d\n",
> > + rproc->name, ret);
> > + goto stop_rproc;
> > + }
> > +
> > + rproc->state = RPROC_RUNNING;
> > +
> > + dev_info(dev, "remote processor %s is now attached\n", rproc->name);
> > +
> > + return 0;
> > +
> > +stop_rproc:
> > + rproc->ops->stop(rproc);
> > +unprepare_subdevices:
> > + rproc_unprepare_subdevices(rproc);
> > +out:
> > + return ret;
> > +}
> > +
> > /*
> > * take a firmware and boot a remote processor with it.
> > */
> > --
> > 2.20.1
> >
