Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_atomic_helper.h>
9#include <drm/drm_fourcc.h>
10#include <drm/drm_framebuffer.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 .reset = drm_atomic_helper_plane_reset,
18 .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
19 .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
20};
21
22static int tilcdc_plane_atomic_check(struct drm_plane *plane,
23 struct drm_atomic_state *state)
24{
25 struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
26 plane);
27 struct drm_crtc_state *crtc_state;
28 struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
29 plane);
30 unsigned int pitch;
31
32 if (!new_state->crtc)
33 return 0;
34
35 if (WARN_ON(!new_state->fb))
36 return -EINVAL;
37
38 if (new_state->crtc_x || new_state->crtc_y) {
39 drm_err(plane->dev, "%s: crtc position must be zero.",
40 __func__);
41 return -EINVAL;
42 }
43
44 crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc);
45 /* we should have a crtc state if the plane is attached to a crtc */
46 if (WARN_ON(!crtc_state))
47 return 0;
48
49 if (crtc_state->mode.hdisplay != new_state->crtc_w ||
50 crtc_state->mode.vdisplay != new_state->crtc_h) {
51 drm_err(plane->dev,
52 "%s: Size must match mode (%dx%d == %dx%d)", __func__,
53 crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
54 new_state->crtc_w, new_state->crtc_h);
55 return -EINVAL;
56 }
57
58 pitch = crtc_state->mode.hdisplay *
59 new_state->fb->format->cpp[0];
60 if (new_state->fb->pitches[0] != pitch) {
61 drm_err(plane->dev,
62 "Invalid pitch: fb and crtc widths must be the same");
63 return -EINVAL;
64 }
65
66 if (old_state->fb && new_state->fb->format != old_state->fb->format) {
67 drm_dbg(plane->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
76static void tilcdc_plane_atomic_update(struct drm_plane *plane,
77 struct drm_atomic_state *state)
78{
79 struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
80 plane);
81
82 if (!new_state->crtc)
83 return;
84
85 if (WARN_ON(!new_state->fb || !new_state->crtc->state))
86 return;
87
88 if (tilcdc_crtc_update_fb(new_state->crtc,
89 new_state->fb,
90 new_state->crtc->state->event) == 0) {
91 new_state->crtc->state->event = NULL;
92 }
93}
94
95static const struct drm_plane_helper_funcs plane_helper_funcs = {
96 .atomic_check = tilcdc_plane_atomic_check,
97 .atomic_update = tilcdc_plane_atomic_update,
98};
99
100struct tilcdc_plane *tilcdc_plane_init(struct drm_device *dev)
101{
102 struct tilcdc_drm_private *priv = ddev_to_tilcdc_priv(dev);
103 struct tilcdc_plane *plane;
104
105 plane = drmm_universal_plane_alloc(dev, struct tilcdc_plane, base,
106 1, &tilcdc_plane_funcs,
107 priv->pixelformats,
108 priv->num_pixelformats,
109 NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
110 if (IS_ERR(plane))
111 return plane;
112
113 drm_plane_helper_add(&plane->base, &plane_helper_funcs);
114
115 return plane;
116}