Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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 .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_atomic_state *state)
25{
26 struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
27 plane);
28 struct drm_crtc_state *crtc_state;
29 struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
30 plane);
31 unsigned int pitch;
32
33 if (!new_state->crtc)
34 return 0;
35
36 if (WARN_ON(!new_state->fb))
37 return -EINVAL;
38
39 if (new_state->crtc_x || new_state->crtc_y) {
40 dev_err(plane->dev->dev, "%s: crtc position must be zero.",
41 __func__);
42 return -EINVAL;
43 }
44
45 crtc_state = drm_atomic_get_new_crtc_state(state, new_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 != new_state->crtc_w ||
51 crtc_state->mode.vdisplay != new_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 new_state->crtc_w, new_state->crtc_h);
56 return -EINVAL;
57 }
58
59 pitch = crtc_state->mode.hdisplay *
60 new_state->fb->format->cpp[0];
61 if (new_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 (old_state->fb && new_state->fb->format != old_state->fb->format) {
68 dev_dbg(plane->dev->dev,
69 "%s(): pixel format change requires mode_change\n",
70 __func__);
71 crtc_state->mode_changed = true;
72 }
73
74 return 0;
75}
76
77static void tilcdc_plane_atomic_update(struct drm_plane *plane,
78 struct drm_atomic_state *state)
79{
80 struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
81 plane);
82
83 if (!new_state->crtc)
84 return;
85
86 if (WARN_ON(!new_state->fb || !new_state->crtc->state))
87 return;
88
89 if (tilcdc_crtc_update_fb(new_state->crtc,
90 new_state->fb,
91 new_state->crtc->state->event) == 0) {
92 new_state->crtc->state->event = NULL;
93 }
94}
95
96static const struct drm_plane_helper_funcs plane_helper_funcs = {
97 .atomic_check = tilcdc_plane_atomic_check,
98 .atomic_update = tilcdc_plane_atomic_update,
99};
100
101int tilcdc_plane_init(struct drm_device *dev,
102 struct drm_plane *plane)
103{
104 struct tilcdc_drm_private *priv = dev->dev_private;
105 int ret;
106
107 ret = drm_universal_plane_init(dev, plane, 1, &tilcdc_plane_funcs,
108 priv->pixelformats,
109 priv->num_pixelformats,
110 NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
111 if (ret) {
112 dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
113 return ret;
114 }
115
116 drm_plane_helper_add(plane, &plane_helper_funcs);
117
118 return 0;
119}