rpmsg: glink: Add support to preallocate intents

The base intents prequeued during channel creation may not satisfy a
channel's throughput requirement. Add support for intents dt-binding to
allow channels to specify the size and amount of intents to prequeue
during endpoint announcement.

Signed-off-by: Chris Lew <clew@codeaurora.org>
[bjorn: Altered how defaults are expressed]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/rpmsg/qcom_glink_native.c

@@ -1149,19 +1149,38 @@ static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
 static int qcom_glink_announce_create(struct rpmsg_device *rpdev)
 {
 	struct glink_channel *channel = to_glink_channel(rpdev->ept);
-	struct glink_core_rx_intent *intent;
+	struct device_node *np = rpdev->dev.of_node;
 	struct qcom_glink *glink = channel->glink;
-	int num_intents = glink->intentless ? 0 : 5;
+	struct glink_core_rx_intent *intent;
+	const struct property *prop = NULL;
+	__be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) };
+	int num_intents;
+	int num_groups = 1;
+	__be32 *val = defaults;
+	int size;
+
+	if (glink->intentless)
+		return 0;
+
+	prop = of_find_property(np, "qcom,intents", NULL);
+	if (prop) {
+		val = prop->value;
+		num_groups = prop->length / sizeof(u32) / 2;
+	}
 
 	/* Channel is now open, advertise base set of intents */
-	while (num_intents--) {
-		intent = qcom_glink_alloc_intent(glink, channel, SZ_1K, true);
-		if (!intent)
-			break;
+	while (num_groups--) {
+		size = be32_to_cpup(val++);
+		num_intents = be32_to_cpup(val++);
+		while (num_intents--) {
+			intent = qcom_glink_alloc_intent(glink, channel, size,
+							 true);
+			if (!intent)
+				break;
 
-		qcom_glink_advertise_intent(glink, channel, intent);
+			qcom_glink_advertise_intent(glink, channel, intent);
+		}
 	}
-
 	return 0;
 }