1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2015 Texas Instruments
4 * Author: Jyri Sarha <jsarha@ti.com>
5 */
6
7 #include <drm/drm_atomic.h>
8 #include <drm/drm_plane_helper.h>
9 #include <drm/drm_atomic_helper.h>
10 #include <drm/drm_fourcc.h>
11
12 #include "tilcdc_drv.h"
13
14 static const struct drm_plane_funcs tilcdc_plane_funcs = {
15 .update_plane = drm_atomic_helper_update_plane,
16 .disable_plane = drm_atomic_helper_disable_plane,
17 .destroy = drm_plane_cleanup,
18 .reset = drm_atomic_helper_plane_reset,
19 .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
20 .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
21 };
22
tilcdc_plane_atomic_check(struct drm_plane * plane,struct drm_plane_state * state)23 static int tilcdc_plane_atomic_check(struct drm_plane *plane,
24 struct drm_plane_state *state)
25 {
26 struct drm_crtc_state *crtc_state;
27 struct drm_plane_state *old_state = plane->state;
28 unsigned int pitch;
29
30 if (!state->crtc)
31 return 0;
32
33 if (WARN_ON(!state->fb))
34 return -EINVAL;
35
36 if (state->crtc_x || state->crtc_y) {
37 dev_err(plane->dev->dev, "%s: crtc position must be zero.",
38 __func__);
39 return -EINVAL;
40 }
41
42 crtc_state = drm_atomic_get_existing_crtc_state(state->state,
43 state->crtc);
44 /* we should have a crtc state if the plane is attached to a crtc */
45 if (WARN_ON(!crtc_state))
46 return 0;
47
48 if (crtc_state->mode.hdisplay != state->crtc_w ||
49 crtc_state->mode.vdisplay != state->crtc_h) {
50 dev_err(plane->dev->dev,
51 "%s: Size must match mode (%dx%d == %dx%d)", __func__,
52 crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
53 state->crtc_w, state->crtc_h);
54 return -EINVAL;
55 }
56
57 pitch = crtc_state->mode.hdisplay *
58 state->fb->format->cpp[0];
59 if (state->fb->pitches[0] != pitch) {
60 dev_err(plane->dev->dev,
61 "Invalid pitch: fb and crtc widths must be the same");
62 return -EINVAL;
63 }
64
65 if (old_state->fb && state->fb->format != old_state->fb->format) {
66 dev_dbg(plane->dev->dev,
67 "%s(): pixel format change requires mode_change\n",
68 __func__);
69 crtc_state->mode_changed = true;
70 }
71
72 return 0;
73 }
74
tilcdc_plane_atomic_update(struct drm_plane * plane,struct drm_plane_state * old_state)75 static void tilcdc_plane_atomic_update(struct drm_plane *plane,
76 struct drm_plane_state *old_state)
77 {
78 struct drm_plane_state *state = plane->state;
79
80 if (!state->crtc)
81 return;
82
83 if (WARN_ON(!state->fb || !state->crtc->state))
84 return;
85
86 if (tilcdc_crtc_update_fb(state->crtc,
87 state->fb,
88 state->crtc->state->event) == 0) {
89 state->crtc->state->event = NULL;
90 }
91 }
92
93 static const struct drm_plane_helper_funcs plane_helper_funcs = {
94 .atomic_check = tilcdc_plane_atomic_check,
95 .atomic_update = tilcdc_plane_atomic_update,
96 };
97
tilcdc_plane_init(struct drm_device * dev,struct drm_plane * plane)98 int tilcdc_plane_init(struct drm_device *dev,
99 struct drm_plane *plane)
100 {
101 struct tilcdc_drm_private *priv = dev->dev_private;
102 int ret;
103
104 ret = drm_plane_init(dev, plane, 1,
105 &tilcdc_plane_funcs,
106 priv->pixelformats,
107 priv->num_pixelformats,
108 true);
109 if (ret) {
110 dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
111 return ret;
112 }
113
114 drm_plane_helper_add(plane, &plane_helper_funcs);
115
116 return 0;
117 }
118
