Update the M4 co-processor state in function stm32_rproc_stop() so that it can be used in synchronisation scenarios. Mainly based on the work published by Arnaud Pouliquen [1]. [1]. https://patchwork.kernel.org/project/linux-remoteproc/list/?series=239877 Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx> --- drivers/remoteproc/stm32_rproc.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c index 404f17a97095..86d23c35d805 100644 --- a/drivers/remoteproc/stm32_rproc.c +++ b/drivers/remoteproc/stm32_rproc.c @@ -493,6 +493,18 @@ 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; } @@ -531,6 +543,7 @@ static struct rproc_ops st_rproc_ops = { static __maybe_unused struct rproc_ops st_rproc_sync_ops = { .start = stm32_rproc_sync_start, + .stop = stm32_rproc_stop, }; static const struct of_device_id stm32_rproc_match[] = { -- 2.20.1
