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remoteproc: Introducing function rproc_attach()

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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.poirier@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Link: https://lore.kernel.org/r/20200714195035.1426873-4-mathieu.poirier@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Mathieu Poirier 2020-07-14 13:50:29 -06:00 committed by Bjorn Andersson
parent a6a4f28575
commit d848a4819d
1 changed files with 42 additions and 0 deletions
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42
drivers/remoteproc/remoteproc_core.c
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@ -1372,6 +1372,48 @@ reset_table_ptr:
return ret;
}
static int __maybe_unused rproc_attach(struct rproc *rproc)
{
struct device *dev = &rproc->dev;
int ret;
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.
*/