1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * RZ/G2L Display Unit Encoder
4 *
5 * Copyright (C) 2023 Renesas Electronics Corporation
6 *
7 * Based on rcar_du_encoder.c
8 */
9
10 #include <linux/export.h>
11 #include <linux/of.h>
12
13 #include <drm/drm_bridge.h>
14 #include <drm/drm_bridge_connector.h>
15 #include <drm/drm_panel.h>
16
17 #include "rzg2l_du_drv.h"
18 #include "rzg2l_du_encoder.h"
19
20 /* -----------------------------------------------------------------------------
21 * Encoder
22 */
23
24 static const struct drm_encoder_funcs rzg2l_du_encoder_funcs = {
25 };
26
rzg2l_du_encoder_init(struct rzg2l_du_device * rcdu,enum rzg2l_du_output output,struct device_node * enc_node)27 int rzg2l_du_encoder_init(struct rzg2l_du_device *rcdu,
28 enum rzg2l_du_output output,
29 struct device_node *enc_node)
30 {
31 struct rzg2l_du_encoder *renc;
32 struct drm_connector *connector;
33 struct drm_bridge *bridge;
34 int ret;
35
36 /* Locate the DRM bridge from the DT node. */
37 bridge = of_drm_find_bridge(enc_node);
38 if (!bridge)
39 return -EPROBE_DEFER;
40
41 dev_dbg(rcdu->dev, "initializing encoder %pOF for output %s\n",
42 enc_node, rzg2l_du_output_name(output));
43
44 renc = drmm_encoder_alloc(&rcdu->ddev, struct rzg2l_du_encoder, base,
45 &rzg2l_du_encoder_funcs, DRM_MODE_ENCODER_NONE,
46 NULL);
47 if (IS_ERR(renc))
48 return PTR_ERR(renc);
49
50 renc->output = output;
51
52 /* Attach the bridge to the encoder. */
53 ret = drm_bridge_attach(&renc->base, bridge, NULL,
54 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
55 if (ret) {
56 dev_err(rcdu->dev,
57 "failed to attach bridge %pOF for output %s (%d)\n",
58 bridge->of_node, rzg2l_du_output_name(output), ret);
59 return ret;
60 }
61
62 /* Create the connector for the chain of bridges. */
63 connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base);
64 if (IS_ERR(connector)) {
65 dev_err(rcdu->dev,
66 "failed to created connector for output %s (%ld)\n",
67 rzg2l_du_output_name(output), PTR_ERR(connector));
68 return PTR_ERR(connector);
69 }
70
71 return drm_connector_attach_encoder(connector, &renc->base);
72 }
73