linux-kernel - [PATCH 2/5] drm_dp_mst_topology: use correct AUX channel

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Date:   Tue,  1 Sep 2020 16:22:16 +1000
From:   Sam McNally <sammc@...omium.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Hans Verkuil <hans.verkuil@...co.com>,
        Sam McNally <sammc@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH 2/5] drm_dp_mst_topology: use correct AUX channel

From: Hans Verkuil <hans.verkuil@...co.com>

For adapters behind an MST hub use the correct AUX channel.

Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
[sammc@...omium.org: rebased, removing redundant changes]
Signed-off-by: Sam McNally <sammc@...omium.org>
---

 drivers/gpu/drm/drm_dp_mst_topology.c | 36 +++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 15b6cc39a754..0d753201adbd 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2255,6 +2255,9 @@ drm_dp_mst_topology_unlink_port(struct drm_dp_mst_topology_mgr *mgr,
 	drm_dp_mst_topology_put_port(port);
 }
 
+static ssize_t
+drm_dp_mst_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg);
+
 static struct drm_dp_mst_port *
 drm_dp_mst_add_port(struct drm_device *dev,
 		    struct drm_dp_mst_topology_mgr *mgr,
@@ -2271,9 +2274,13 @@ drm_dp_mst_add_port(struct drm_device *dev,
 	port->port_num = port_number;
 	port->mgr = mgr;
 	port->aux.name = "DPMST";
+	mutex_init(&port->aux.hw_mutex);
+	mutex_init(&port->aux.cec.lock);
 	port->aux.dev = dev->dev;
 	port->aux.is_remote = true;
 
+	port->aux.transfer = drm_dp_mst_aux_transfer;
+
 	/* initialize the MST downstream port's AUX crc work queue */
 	drm_dp_remote_aux_init(&port->aux);
 
@@ -3503,6 +3510,35 @@ static int drm_dp_send_up_ack_reply(struct drm_dp_mst_topology_mgr *mgr,
 	return 0;
 }
 
+static ssize_t
+drm_dp_mst_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
+{
+	struct drm_dp_mst_port *port =
+		container_of(aux, struct drm_dp_mst_port, aux);
+	int ret;
+
+	switch (msg->request & ~DP_AUX_I2C_MOT) {
+	case DP_AUX_NATIVE_WRITE:
+	case DP_AUX_I2C_WRITE:
+	case DP_AUX_I2C_WRITE_STATUS_UPDATE:
+		ret = drm_dp_send_dpcd_write(port->mgr, port, msg->address,
+					     msg->size, msg->buffer);
+		break;
+
+	case DP_AUX_NATIVE_READ:
+	case DP_AUX_I2C_READ:
+		ret = drm_dp_send_dpcd_read(port->mgr, port, msg->address,
+					    msg->size, msg->buffer);
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
 static int drm_dp_get_vc_payload_bw(u8 dp_link_bw, u8  dp_link_count)
 {
 	if (dp_link_bw == 0 || dp_link_count == 0)
-- 
2.28.0.402.g5ffc5be6b7-goog