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SubjectRe: [PATCH v4 3/5] remoteproc: Add prepare/unprepare callbacks
On Wed 15 Jan 13:15 PST 2020, Paul Cercueil wrote:

> Hi Bjorn,
>
>
> Le sam., déc. 21, 2019 at 12:20, Bjorn Andersson
> <bjorn.andersson@linaro.org> a écrit :
> > On Tue 10 Dec 08:40 PST 2019, Paul Cercueil wrote:
> >
> > > The .prepare() callback is called before the firmware is loaded to
> > > memory. This is useful for instance in the case where some setup is
> > > required for the memory to be accessible.
> > >
> >
> > Would it make sense to somehow tie this prepare/unprepare to the actual
> > struct rproc_mem_entry that needs the resource enabled?
>
> Do you need such granularity?
>

I don't have such needs, but given some of the memory structure that
Suman and Loic has been talking about I would expect that such need
exists.

> In my case, the three memories need the same clock to be enabled.
>

But we can update your driver to associate your one clock with the
memory objects if/when we end up implementing this later.

Regards,
Bjorn

> -Paul
>
>
> >
> > > Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> > > ---
> > >
> > > Notes:
> > > v2-v4: No change
> > >
> > > drivers/remoteproc/remoteproc_core.c | 16 +++++++++++++++-
> > > include/linux/remoteproc.h | 4 ++++
> > > 2 files changed, 19 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/remoteproc/remoteproc_core.c
> > > b/drivers/remoteproc/remoteproc_core.c
> > > index 0a9fc7fdd1c3..3ea5f675a148 100644
> > > --- a/drivers/remoteproc/remoteproc_core.c
> > > +++ b/drivers/remoteproc/remoteproc_core.c
> > > @@ -1299,11 +1299,19 @@ static int rproc_start(struct rproc *rproc,
> > > const struct firmware *fw)
> > > struct device *dev = &rproc->dev;
> > > int ret;
> > >
> > > + if (rproc->ops->prepare) {
> > > + ret = rproc->ops->prepare(rproc);
> > > + if (ret) {
> > > + dev_err(dev, "Failed to prepare rproc: %d\n", ret);
> > > + return ret;
> > > + }
> > > + }
> > > +
> > > /* load the ELF segments to memory */
> > > ret = rproc_load_segments(rproc, fw);
> > > if (ret) {
> > > dev_err(dev, "Failed to load program segments: %d\n", ret);
> > > - return ret;
> > > + goto unprepare_rproc;
> > > }
> > >
> > > /*
> > > @@ -1354,6 +1362,9 @@ static int rproc_start(struct rproc *rproc,
> > > const struct firmware *fw)
> > > rproc_unprepare_subdevices(rproc);
> > > reset_table_ptr:
> > > rproc->table_ptr = rproc->cached_table;
> > > +unprepare_rproc:
> > > + if (rproc->ops->unprepare)
> > > + rproc->ops->unprepare(rproc);
> > >
> > > return ret;
> > > }
> > > @@ -1483,6 +1494,9 @@ static int rproc_stop(struct rproc *rproc,
> > > bool crashed)
> > >
> > > rproc->state = RPROC_OFFLINE;
> > >
> > > + if (rproc->ops->unprepare)
> > > + rproc->ops->unprepare(rproc);
> > > +
> > > dev_info(dev, "stopped remote processor %s\n", rproc->name);
> > >
> > > return 0;
> > > diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> > > index 5f201f0c86c3..a6272d1ba384 100644
> > > --- a/include/linux/remoteproc.h
> > > +++ b/include/linux/remoteproc.h
> > > @@ -355,6 +355,8 @@ enum rsc_handling_status {
> > >
> > > /**
> > > * struct rproc_ops - platform-specific device handlers
> > > + * @prepare: prepare the device for power up (before the firmware
> > > is loaded)
> > > + * @unprepare: unprepare the device after it is stopped
> > > * @start: power on the device and boot it
> > > * @stop: power off the device
> > > * @kick: kick a virtqueue (virtqueue id given as a parameter)
> > > @@ -371,6 +373,8 @@ enum rsc_handling_status {
> > > * @get_boot_addr: get boot address to entry point specified in
> > > firmware
> > > */
> > > struct rproc_ops {
> > > + int (*prepare)(struct rproc *rproc);
> > > + void (*unprepare)(struct rproc *rproc);
> > > int (*start)(struct rproc *rproc);
> > > int (*stop)(struct rproc *rproc);
> > > void (*kick)(struct rproc *rproc, int vqid);
> > > --
> > > 2.24.0
> > >
>
>

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