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/drmP.h>
8 
9 #include <drm/drm_atomic.h>
10 #include <drm/drm_plane_helper.h>
11 #include <drm/drm_atomic_helper.h>
12 #include <uapi/drm/drm_fourcc.h>
13 
14 #include "tilcdc_drv.h"
15 
16 static struct drm_plane_funcs tilcdc_plane_funcs = {
17 	.update_plane	= drm_atomic_helper_update_plane,
18 	.disable_plane	= drm_atomic_helper_disable_plane,
19 	.destroy	= drm_plane_cleanup,
20 	.reset		= drm_atomic_helper_plane_reset,
21 	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
22 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
23 };
24 
25 static int tilcdc_plane_atomic_check(struct drm_plane *plane,
26 				     struct drm_plane_state *state)
27 {
28 	struct drm_crtc_state *crtc_state;
29 	struct drm_plane_state *old_state = plane->state;
30 	unsigned int pitch;
31 
32 	if (!state->crtc)
33 		return 0;
34 
35 	if (WARN_ON(!state->fb))
36 		return -EINVAL;
37 
38 	if (state->crtc_x || state->crtc_y) {
39 		dev_err(plane->dev->dev, "%s: crtc position must be zero.",
40 			__func__);
41 		return -EINVAL;
42 	}
43 
44 	crtc_state = drm_atomic_get_existing_crtc_state(state->state,
45 							state->crtc);
46 	/* we should have a crtc state if the plane is attached to a crtc */
47 	if (WARN_ON(!crtc_state))
48 		return 0;
49 
50 	if (crtc_state->mode.hdisplay != state->crtc_w ||
51 	    crtc_state->mode.vdisplay != state->crtc_h) {
52 		dev_err(plane->dev->dev,
53 			"%s: Size must match mode (%dx%d == %dx%d)", __func__,
54 			crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
55 			state->crtc_w, state->crtc_h);
56 		return -EINVAL;
57 	}
58 
59 	pitch = crtc_state->mode.hdisplay *
60 		state->fb->format->cpp[0];
61 	if (state->fb->pitches[0] != pitch) {
62 		dev_err(plane->dev->dev,
63 			"Invalid pitch: fb and crtc widths must be the same");
64 		return -EINVAL;
65 	}
66 
67 	if (state->fb && old_state->fb &&
68 	    state->fb->format != old_state->fb->format) {
69 		dev_dbg(plane->dev->dev,
70 			"%s(): pixel format change requires mode_change\n",
71 			__func__);
72 		crtc_state->mode_changed = true;
73 	}
74 
75 	return 0;
76 }
77 
78 static void tilcdc_plane_atomic_update(struct drm_plane *plane,
79 				       struct drm_plane_state *old_state)
80 {
81 	struct drm_plane_state *state = plane->state;
82 
83 	if (!state->crtc)
84 		return;
85 
86 	if (WARN_ON(!state->fb || !state->crtc->state))
87 		return;
88 
89 	tilcdc_crtc_update_fb(state->crtc,
90 			      state->fb,
91 			      state->crtc->state->event);
92 }
93 
94 static const struct drm_plane_helper_funcs plane_helper_funcs = {
95 	.atomic_check = tilcdc_plane_atomic_check,
96 	.atomic_update = tilcdc_plane_atomic_update,
97 };
98 
99 int tilcdc_plane_init(struct drm_device *dev,
100 		      struct drm_plane *plane)
101 {
102 	struct tilcdc_drm_private *priv = dev->dev_private;
103 	int ret;
104 
105 	ret = drm_plane_init(dev, plane, 1,
106 			     &tilcdc_plane_funcs,
107 			     priv->pixelformats,
108 			     priv->num_pixelformats,
109 			     true);
110 	if (ret) {
111 		dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
112 		return ret;
113 	}
114 
115 	drm_plane_helper_add(plane, &plane_helper_funcs);
116 
117 	return 0;
118 }
119