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remoteproc: Introduce function __rproc_detach()

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Introduce function __rproc_detach() to perform the same kind of
operation as rproc_stop(), but instead of switching off the
remote processor using rproc->ops->stop(), it uses
rproc->ops->detach().  That way it is possible for the core
to release the resources associated with a remote processor while
the latter is kept operating.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Link: https://lore.kernel.org/r/20210312162453.1234145-10-mathieu.poirier@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Mathieu Poirier 2021-03-12 09:24:45 -07:00 committed by Bjorn Andersson
parent 7f3bd0c019
commit 6070203fe4
1 changed files with 30 additions and 0 deletions
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30
drivers/remoteproc/remoteproc_core.c
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@ -1712,6 +1712,36 @@ static int rproc_stop(struct rproc *rproc, bool crashed)
return 0;
}
/*
* __rproc_detach(): Does the opposite of __rproc_attach()
*/
static int __maybe_unused __rproc_detach(struct rproc *rproc)
{
struct device *dev = &rproc->dev;
int ret;
/* No need to continue if a detach() operation has not been provided */
if (!rproc->ops->detach)
return -EINVAL;
/* Stop any subdevices for the remote processor */
rproc_stop_subdevices(rproc, false);
/* Tell the remote processor the core isn't available anymore */
ret = rproc->ops->detach(rproc);
if (ret) {
dev_err(dev, "can't detach from rproc: %d\n", ret);
return ret;
}
rproc_unprepare_subdevices(rproc);
rproc->state = RPROC_DETACHED;
dev_info(dev, "detached remote processor %s\n", rproc->name);
return 0;
}
/**
* rproc_trigger_recovery() - recover a remoteproc