From: Hari Nagalla <hnagalla@ti.com>
Date: Wed, 13 Aug 2025 21:47:05 +0000 (-0500)
Subject: remoteproc: k3-r5: Add support for single cpu mode
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=15642829127cd503838f28254a1f3e080103ca4b;p=pandora-u-boot.git

remoteproc: k3-r5: Add support for single cpu mode

Add early boot support for AM64 single cpu mode configuration.
In single CPU mode the 2nd core of the R5F cluster can't be used or
unavailable.

Signed-off-by: Hari Nagalla <hnagalla@ti.com>
---

diff --git a/drivers/remoteproc/ti_k3_r5f_rproc.c b/drivers/remoteproc/ti_k3_r5f_rproc.c
index 3a25ef6bf87..48401bc6eb6 100644
--- a/drivers/remoteproc/ti_k3_r5f_rproc.c
+++ b/drivers/remoteproc/ti_k3_r5f_rproc.c
@@ -233,7 +233,7 @@ static int k3_r5f_prepare(struct udevice *dev)
 
 	dev_dbg(dev, "%s\n", __func__);
 
-	if (cluster->mode == CLUSTER_MODE_LOCKSTEP)
+	if ((cluster->mode == CLUSTER_MODE_LOCKSTEP) || (cluster->mode == CLUSTER_MODE_SINGLECPU))
 		ret = k3_r5f_lockstep_release(cluster);
 	else
 		ret = k3_r5f_split_release(core);
@@ -269,6 +269,13 @@ static int k3_r5f_core_sanity_check(struct k3_r5f_core *core)
 		return -EINVAL;
 	}
 
+	if (cluster->mode == CLUSTER_MODE_SINGLECPU && !is_primary_core(core)) {
+		dev_err(core->dev,
+			"Invalid op: Trying to start secondary core %d in single CPU mode\n",
+			core->tsp.proc_id);
+		return -EINVAL;
+	}
+
 	if (cluster->mode == CLUSTER_MODE_SPLIT && !is_primary_core(core)) {
 		if (!core->cluster->cores[0]->in_use) {
 			dev_err(core->dev,
@@ -768,7 +775,7 @@ static void k3_r5f_core_adjust_tcm_sizes(struct k3_r5f_core *core)
 {
 	struct k3_r5f_cluster *cluster = core->cluster;
 
-	if (cluster->mode == CLUSTER_MODE_LOCKSTEP)
+	if ((cluster->mode == CLUSTER_MODE_LOCKSTEP) || (cluster->mode == CLUSTER_MODE_SINGLECPU))
 		return;
 
 	if (!core->ipdata->tcm_is_double)