1 /*
2  * Copyright (C) 2015 Texas Instruments
3  * Author: Jyri Sarha <jsarha@ti.com>
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 as published by
7  * the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program.  If not, see <http://www.gnu.org/licenses/>.
16  */
17 
18 #include <drm/drmP.h>
19 
20 #include <drm/drm_atomic.h>
21 #include <drm/drm_plane_helper.h>
22 #include <drm/drm_atomic_helper.h>
23 #include <uapi/drm/drm_fourcc.h>
24 
25 #include "tilcdc_drv.h"
26 
27 static struct drm_plane_funcs tilcdc_plane_funcs = {
28 	.update_plane	= drm_atomic_helper_update_plane,
29 	.disable_plane	= drm_atomic_helper_disable_plane,
30 	.destroy	= drm_plane_cleanup,
31 	.reset		= drm_atomic_helper_plane_reset,
32 	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
33 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
34 };
35 
36 static int tilcdc_plane_atomic_check(struct drm_plane *plane,
37 				     struct drm_plane_state *state)
38 {
39 	struct drm_crtc_state *crtc_state;
40 	struct drm_plane_state *old_state = plane->state;
41 	unsigned int pitch;
42 
43 	if (!state->crtc)
44 		return 0;
45 
46 	if (WARN_ON(!state->fb))
47 		return -EINVAL;
48 
49 	if (state->crtc_x || state->crtc_y) {
50 		dev_err(plane->dev->dev, "%s: crtc position must be zero.",
51 			__func__);
52 		return -EINVAL;
53 	}
54 
55 	crtc_state = drm_atomic_get_existing_crtc_state(state->state,
56 							state->crtc);
57 	/* we should have a crtc state if the plane is attached to a crtc */
58 	if (WARN_ON(!crtc_state))
59 		return 0;
60 
61 	if (crtc_state->mode.hdisplay != state->crtc_w ||
62 	    crtc_state->mode.vdisplay != state->crtc_h) {
63 		dev_err(plane->dev->dev,
64 			"%s: Size must match mode (%dx%d == %dx%d)", __func__,
65 			crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
66 			state->crtc_w, state->crtc_h);
67 		return -EINVAL;
68 	}
69 
70 	pitch = crtc_state->mode.hdisplay *
71 		state->fb->format->cpp[0];
72 	if (state->fb->pitches[0] != pitch) {
73 		dev_err(plane->dev->dev,
74 			"Invalid pitch: fb and crtc widths must be the same");
75 		return -EINVAL;
76 	}
77 
78 	if (state->fb && old_state->fb &&
79 	    state->fb->format != old_state->fb->format) {
80 		dev_dbg(plane->dev->dev,
81 			"%s(): pixel format change requires mode_change\n",
82 			__func__);
83 		crtc_state->mode_changed = true;
84 	}
85 
86 	return 0;
87 }
88 
89 static void tilcdc_plane_atomic_update(struct drm_plane *plane,
90 				       struct drm_plane_state *old_state)
91 {
92 	struct drm_plane_state *state = plane->state;
93 
94 	if (!state->crtc)
95 		return;
96 
97 	if (WARN_ON(!state->fb || !state->crtc->state))
98 		return;
99 
100 	tilcdc_crtc_update_fb(state->crtc,
101 			      state->fb,
102 			      state->crtc->state->event);
103 }
104 
105 static const struct drm_plane_helper_funcs plane_helper_funcs = {
106 	.atomic_check = tilcdc_plane_atomic_check,
107 	.atomic_update = tilcdc_plane_atomic_update,
108 };
109 
110 int tilcdc_plane_init(struct drm_device *dev,
111 		      struct drm_plane *plane)
112 {
113 	struct tilcdc_drm_private *priv = dev->dev_private;
114 	int ret;
115 
116 	ret = drm_plane_init(dev, plane, 1,
117 			     &tilcdc_plane_funcs,
118 			     priv->pixelformats,
119 			     priv->num_pixelformats,
120 			     true);
121 	if (ret) {
122 		dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
123 		return ret;
124 	}
125 
126 	drm_plane_helper_add(plane, &plane_helper_funcs);
127 
128 	return 0;
129 }
130