remoteproc: k3: Refactor rproc_reset() implementation into common driver

The rproc_reset() implementations in TI K3 DSP and M4 remoteproc drivers
assert reset in the same way. Refactor the above function into the
ti_k3_common.c driver as k3_rproc_reset() and use it throughout DSP and
M4 drivers for resetting the remote processor.

Signed-off-by: Beleswar Padhi <b-padhi@ti.com>
Tested-by: Judith Mendez <jm@ti.com>
Reviewed-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20250513054510.3439842-18-b-padhi@ti.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Author: 3V3RYONE

drivers/remoteproc/ti_k3_common.c

@@ -109,5 +109,26 @@ void k3_rproc_kick(struct rproc *rproc, int vqid)
 }
 EXPORT_SYMBOL_GPL(k3_rproc_kick);
 
+/* Put the remote processor into reset */
+int k3_rproc_reset(struct k3_rproc *kproc)
+{
+	struct device *dev = kproc->dev;
+	int ret;
+
+	if (kproc->data->uses_lreset) {
+		ret = reset_control_assert(kproc->reset);
+		if (ret)
+			dev_err(dev, "local-reset assert failed (%pe)\n", ERR_PTR(ret));
+	} else {
+		ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
+							    kproc->ti_sci_id);
+		if (ret)
+			dev_err(dev, "module-reset assert failed (%pe)\n", ERR_PTR(ret));
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(k3_rproc_reset);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("TI K3 common Remoteproc code");

drivers/remoteproc/ti_k3_common.h

@@ -95,4 +95,5 @@ struct k3_rproc {
 
 void k3_rproc_mbox_callback(struct mbox_client *client, void *data);
 void k3_rproc_kick(struct rproc *rproc, int vqid);
+int k3_rproc_reset(struct k3_rproc *kproc);
 #endif /* REMOTEPROC_TI_K3_COMMON_H */

drivers/remoteproc/ti_k3_dsp_remoteproc.c

@@ -24,26 +24,6 @@
 
 #define KEYSTONE_RPROC_LOCAL_ADDRESS_MASK	(SZ_16M - 1)
 
-/* Put the DSP processor into reset */
-static int k3_dsp_rproc_reset(struct k3_rproc *kproc)
-{
-	struct device *dev = kproc->dev;
-	int ret;
-
-	if (kproc->data->uses_lreset) {
-		ret = reset_control_assert(kproc->reset);
-		if (ret)
-			dev_err(dev, "local-reset assert failed (%pe)\n", ERR_PTR(ret));
-	} else {
-		ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
-							    kproc->ti_sci_id);
-		if (ret)
-			dev_err(dev, "module-reset assert failed (%pe)\n", ERR_PTR(ret));
-	}
-
-	return ret;
-}
-
 /* Release the DSP processor from reset */
 static int k3_dsp_rproc_release(struct k3_rproc *kproc)
 {
@@ -197,7 +177,7 @@ static int k3_dsp_rproc_stop(struct rproc *rproc)
 {
 	struct k3_rproc *kproc = rproc->priv;
 
-	k3_dsp_rproc_reset(kproc);
+	k3_rproc_reset(kproc);
 
 	return 0;
 }
@@ -561,7 +541,7 @@ static int k3_dsp_rproc_probe(struct platform_device *pdev)
 				return dev_err_probe(dev, ret, "failed to get reset status\n");
 			} else if (ret == 0) {
 				dev_warn(dev, "local reset is deasserted for device\n");
-				k3_dsp_rproc_reset(kproc);
+				k3_rproc_reset(kproc);
 			}
 		}
 	}

drivers/remoteproc/ti_k3_m4_remoteproc.c

@@ -21,26 +21,6 @@
 #include "ti_sci_proc.h"
 #include "ti_k3_common.h"
 
-/* Put the M4 remote processor into reset */
-static int k3_m4_rproc_reset(struct k3_rproc *kproc)
-{
-	struct device *dev = kproc->dev;
-	int ret;
-
-	if (kproc->data->uses_lreset) {
-		ret = reset_control_assert(kproc->reset);
-		if (ret)
-			dev_err(dev, "local-reset assert failed, ret = %d\n", ret);
-	} else {
-		ret = kproc->ti_sci->ops.dev_ops.put_device(kproc->ti_sci,
-							    kproc->ti_sci_id);
-		if (ret)
-			dev_err(dev, "module-reset assert failed, ret = %d\n", ret);
-	}
-
-	return ret;
-}
-
 static int k3_m4_rproc_ping_mbox(struct k3_rproc *kproc)
 {
 	struct device *dev = kproc->dev;
@@ -85,7 +65,7 @@ static int k3_m4_rproc_prepare(struct rproc *rproc)
 	 * Ensure the local reset is asserted so the core doesn't
 	 * execute bogus code when the module reset is released.
 	 */
-	ret = k3_m4_rproc_reset(kproc);
+	ret = k3_rproc_reset(kproc);
 	if (ret)
 		return ret;
 
@@ -393,7 +373,7 @@ static int k3_m4_rproc_stop(struct rproc *rproc)
 {
 	struct k3_rproc *kproc = rproc->priv;
 
-	return k3_m4_rproc_reset(kproc);
+	return k3_rproc_reset(kproc);
 }
 
 /*