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remoteproc: stm32: Update M4 state in stm32_rproc_stop()

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Update the co-processor state in function stm32_rproc_stop() so that
it can be used in scenarios where the remoteproc core is attaching
to the M4.

Mainly based on the work published by Arnaud Pouliquen [1].

[1]. https://patchwork.kernel.org/project/linux-remoteproc/list/?series=239877

Acked-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Link: https://lore.kernel.org/r/20200714200445.1427257-12-mathieu.poirier@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Mathieu Poirier 2020-07-14 14:04:45 -06:00 committed by Bjorn Andersson
parent bee04d4672
commit efd8626213
1 changed files with 12 additions and 0 deletions
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12
drivers/remoteproc/stm32_rproc.c
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@ -504,6 +504,18 @@ static int stm32_rproc_stop(struct rproc *rproc)
}
}
/* update coprocessor state to OFF if available */
if (ddata->m4_state.map) {
err = regmap_update_bits(ddata->m4_state.map,
ddata->m4_state.reg,
ddata->m4_state.mask,
M4_STATE_OFF);
if (err) {
dev_err(&rproc->dev, "failed to set copro state\n");
return err;
}
}
return 0;
}