Add the capability for a rpmsg local endpoint to informs the
remote of its state using the flow control channel.
If the feature is not supported by the remote processor, no
message is sent.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@xxxxxxxxxxx>
---
drivers/rpmsg/virtio_rpmsg_bus.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 40d2ab86b395..96bd12095c8c 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -154,6 +154,8 @@ static ssize_t virtio_rpmsg_get_mtu(struct rpmsg_endpoint *ept);
static struct rpmsg_device *__rpmsg_create_channel(struct virtproc_info *vrp,
struct rpmsg_channel_info *chinfo);
+static int virtio_rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool enable);
+
static const struct rpmsg_endpoint_ops virtio_endpoint_ops = {
.destroy_ept = virtio_rpmsg_destroy_ept,
.send = virtio_rpmsg_send,
@@ -163,6 +165,7 @@ static const struct rpmsg_endpoint_ops virtio_endpoint_ops = {
.trysendto = virtio_rpmsg_trysendto,
.trysend_offchannel = virtio_rpmsg_trysend_offchannel,
.get_mtu = virtio_rpmsg_get_mtu,
+ .set_flow_control = virtio_rpmsg_set_flow_control,
};
/**
@@ -745,6 +748,34 @@ static ssize_t virtio_rpmsg_get_mtu(struct rpmsg_endpoint *ept)
return vch->vrp->buf_size - sizeof(struct rpmsg_hdr);
}
+static int virtio_rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool enable)
+{
+ struct rpmsg_device *rpdev;
+ struct virtio_rpmsg_channel *vch;
+ int err = 0;
+
+ if (!ept)
+ return -EINVAL;
+
+ rpdev = ept->rpdev;
+ vch = to_virtio_rpmsg_channel(rpdev);
+
+ if (virtio_has_feature(vch->vrp->vdev, VIRTIO_RPMSG_F_FC)) {
+ struct rpmsg_ept_msg msg;
+
+ msg.src = cpu_to_rpmsg32(rpdev, ept->addr);
+ msg.dst = cpu_to_rpmsg32(rpdev, rpdev->dst);
+ msg.flags = cpu_to_rpmsg32(rpdev, enable ? RPMSG_EPT_FC_ON : 0);
+
+ err = rpmsg_sendto(ept, &msg, sizeof(msg), RPMSG_FC_ADDR);
+ if (err)
+ dev_err(&rpdev->dev, "Failed to set endpoint 0x%x state %sable (%d)\n",
+ ept->addr, enable ? "en" : "dis", err);
+ }
+
+ return err;
+}
+
static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
struct rpmsg_hdr *msg, unsigned int len)
{
--
2.25.1
