linux-kernel - [PATCH v2 3/4] remoteproc: stm32: Create sub-functions to request shutdown and release

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Message-ID: <20240118100433.3984196-4-arnaud.pouliquen@foss.st.com>
Date: Thu, 18 Jan 2024 11:04:32 +0100
From: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier
	<mathieu.poirier@...aro.org>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Rob
 Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
CC: <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <op-tee@...ts.trustedfirmware.org>, <devicetree@...r.kernel.org>,
        Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
Subject: [PATCH v2 3/4] remoteproc: stm32: Create sub-functions to request shutdown and release

To prepare for the support of TEE remoteproc, create sub-functions
that can be used in both cases, with and without TEE support.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
 drivers/remoteproc/stm32_rproc.c | 84 +++++++++++++++++++-------------
 1 file changed, 51 insertions(+), 33 deletions(-)

diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
index 4f469f0bcf8b..fcc0001e2657 100644
--- a/drivers/remoteproc/stm32_rproc.c
+++ b/drivers/remoteproc/stm32_rproc.c
@@ -209,6 +209,54 @@ static int stm32_rproc_mbox_idx(struct rproc *rproc, const unsigned char *name)
 	return -EINVAL;
 }
 
+static void stm32_rproc_request_shutdown(struct rproc *rproc)
+{
+	struct stm32_rproc *ddata = rproc->priv;
+	int err, dummy_data, idx;
+
+	/* Request shutdown of the remote processor */
+	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) {
+			/* A dummy data is sent to allow to block on transmit. */
+			err = mbox_send_message(ddata->mb[idx].chan,
+						&dummy_data);
+			if (err < 0)
+				dev_warn(&rproc->dev, "warning: remote FW shutdown without ack\n");
+		}
+	}
+}
+
+static int stm32_rproc_release(struct rproc *rproc)
+{
+	struct stm32_rproc *ddata = rproc->priv;
+	unsigned int err = 0;
+
+	/* To allow platform Standby power mode, set remote proc Deep Sleep. */
+	if (ddata->pdds.map) {
+		err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
+					 ddata->pdds.mask, 1);
+		if (err) {
+			dev_err(&rproc->dev, "failed to set pdds\n");
+			return err;
+		}
+	}
+
+	/* 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 err;
+}
+
 static int stm32_rproc_prepare(struct rproc *rproc)
 {
 	struct device *dev = rproc->dev.parent;
@@ -519,17 +567,9 @@ static int stm32_rproc_detach(struct rproc *rproc)
 static int stm32_rproc_stop(struct rproc *rproc)
 {
 	struct stm32_rproc *ddata = rproc->priv;
-	int err, idx;
+	int err;
 
-	/* request shutdown of the remote processor */
-	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");
-			if (err < 0)
-				dev_warn(&rproc->dev, "warning: remote FW shutdown without ack\n");
-		}
-	}
+	stm32_rproc_request_shutdown(rproc);
 
 	err = stm32_rproc_set_hold_boot(rproc, true);
 	if (err)
@@ -541,29 +581,7 @@ static int stm32_rproc_stop(struct rproc *rproc)
 		return err;
 	}
 
-	/* to allow platform Standby power mode, set remote proc Deep Sleep */
-	if (ddata->pdds.map) {
-		err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
-					 ddata->pdds.mask, 1);
-		if (err) {
-			dev_err(&rproc->dev, "failed to set pdds\n");
-			return err;
-		}
-	}
-
-	/* 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;
+	return stm32_rproc_release(rproc);
 }
 
 static void stm32_rproc_kick(struct rproc *rproc, int vqid)
-- 
2.25.1