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 
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 (state->fb && old_state->fb &&
66 	    state->fb->format != old_state->fb->format) {
67 		dev_dbg(plane->dev->dev,
68 			"%s(): pixel format change requires mode_change\n",
69 			__func__);
70 		crtc_state->mode_changed = true;
71 	}
72 
73 	return 0;
74 }
75 
76 static void tilcdc_plane_atomic_update(struct drm_plane *plane,
77 				       struct drm_plane_state *old_state)
78 {
79 	struct drm_plane_state *state = plane->state;
80 
81 	if (!state->crtc)
82 		return;
83 
84 	if (WARN_ON(!state->fb || !state->crtc->state))
85 		return;
86 
87 	tilcdc_crtc_update_fb(state->crtc,
88 			      state->fb,
89 			      state->crtc->state->event);
90 }
91 
92 static const struct drm_plane_helper_funcs plane_helper_funcs = {
93 	.atomic_check = tilcdc_plane_atomic_check,
94 	.atomic_update = tilcdc_plane_atomic_update,
95 };
96 
97 int tilcdc_plane_init(struct drm_device *dev,
98 		      struct drm_plane *plane)
99 {
100 	struct tilcdc_drm_private *priv = dev->dev_private;
101 	int ret;
102 
103 	ret = drm_plane_init(dev, plane, 1,
104 			     &tilcdc_plane_funcs,
105 			     priv->pixelformats,
106 			     priv->num_pixelformats,
107 			     true);
108 	if (ret) {
109 		dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
110 		return ret;
111 	}
112 
113 	drm_plane_helper_add(plane, &plane_helper_funcs);
114 
115 	return 0;
116 }
117