1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
4 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
5 */
6
7 #include <linux/export.h>
8
9 #include <drm/drm_crtc.h>
10 #include <drm/drm_modeset_helper_vtables.h>
11 #include <drm/drm_panel.h>
12 #include <drm/drm_of.h>
13
14 #include "tidss_crtc.h"
15 #include "tidss_drv.h"
16 #include "tidss_encoder.h"
17
tidss_encoder_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)18 static int tidss_encoder_atomic_check(struct drm_encoder *encoder,
19 struct drm_crtc_state *crtc_state,
20 struct drm_connector_state *conn_state)
21 {
22 struct drm_device *ddev = encoder->dev;
23 struct tidss_crtc_state *tcrtc_state = to_tidss_crtc_state(crtc_state);
24 struct drm_display_info *di = &conn_state->connector->display_info;
25 struct drm_bridge *bridge;
26 bool bus_flags_set = false;
27
28 dev_dbg(ddev->dev, "%s\n", __func__);
29
30 /*
31 * Take the bus_flags from the first bridge that defines
32 * bridge timings, or from the connector's display_info if no
33 * bridge defines the timings.
34 */
35 drm_for_each_bridge_in_chain(encoder, bridge) {
36 if (!bridge->timings)
37 continue;
38
39 tcrtc_state->bus_flags = bridge->timings->input_bus_flags;
40 bus_flags_set = true;
41 break;
42 }
43
44 if (!di->bus_formats || di->num_bus_formats == 0) {
45 dev_err(ddev->dev, "%s: No bus_formats in connected display\n",
46 __func__);
47 return -EINVAL;
48 }
49
50 // XXX any cleaner way to set bus format and flags?
51 tcrtc_state->bus_format = di->bus_formats[0];
52 if (!bus_flags_set)
53 tcrtc_state->bus_flags = di->bus_flags;
54
55 return 0;
56 }
57
tidss_encoder_destroy(struct drm_encoder * encoder)58 static void tidss_encoder_destroy(struct drm_encoder *encoder)
59 {
60 drm_encoder_cleanup(encoder);
61 kfree(encoder);
62 }
63
64 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
65 .atomic_check = tidss_encoder_atomic_check,
66 };
67
68 static const struct drm_encoder_funcs encoder_funcs = {
69 .destroy = tidss_encoder_destroy,
70 };
71
tidss_encoder_create(struct tidss_device * tidss,u32 encoder_type,u32 possible_crtcs)72 struct drm_encoder *tidss_encoder_create(struct tidss_device *tidss,
73 u32 encoder_type, u32 possible_crtcs)
74 {
75 struct drm_encoder *enc;
76 int ret;
77
78 enc = kzalloc(sizeof(*enc), GFP_KERNEL);
79 if (!enc)
80 return ERR_PTR(-ENOMEM);
81
82 enc->possible_crtcs = possible_crtcs;
83
84 ret = drm_encoder_init(&tidss->ddev, enc, &encoder_funcs,
85 encoder_type, NULL);
86 if (ret < 0) {
87 kfree(enc);
88 return ERR_PTR(ret);
89 }
90
91 drm_encoder_helper_add(enc, &encoder_helper_funcs);
92
93 dev_dbg(tidss->dev, "Encoder create done\n");
94
95 return enc;
96 }
97