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
14static 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
23static 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
75static 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
93static 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
98int 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