linux-kernel - [PATCH] remoteproc: stm32: Improve crash recovery time

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Date:   Tue, 21 Dec 2021 15:31:29 +0100
From:   Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <arnaud.pouliquen@...s.st.com>
Subject: [PATCH] remoteproc: stm32: Improve crash recovery time

When a stop is requested on a crash, it is useless to try to shutdown it
gracefully, it is crashed.

In this case don't send the STM32_MBX_SHUTDOWN mailbox message that
will block the recovery during 500 ms, waiting an answer from the
coprocessor.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
 drivers/remoteproc/stm32_rproc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
index b643efcf995a..7d782ed9e589 100644
--- a/drivers/remoteproc/stm32_rproc.c
+++ b/drivers/remoteproc/stm32_rproc.c
@@ -494,7 +494,7 @@ static int stm32_rproc_stop(struct rproc *rproc)
 	int err, idx;
 
 	/* request shutdown of the remote processor */
-	if (rproc->state != RPROC_OFFLINE) {
+	if (rproc->state != RPROC_OFFLINE && rproc->state != RPROC_CRASHED) {
 		idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_SHUTDOWN);
 		if (idx >= 0 && ddata->mb[idx].chan) {
 			err = mbox_send_message(ddata->mb[idx].chan, "detach");
-- 
2.17.1