tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (c) 2015 MediaTek Inc.
3 * Author: CK Hu <ck.hu@mediatek.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include <drm/drmP.h>
16#include <drm/drm_atomic.h>
17#include <drm/drm_atomic_helper.h>
18#include <drm/drm_plane_helper.h>
19
20#include "mtk_drm_crtc.h"
21#include "mtk_drm_ddp_comp.h"
22#include "mtk_drm_drv.h"
23#include "mtk_drm_fb.h"
24#include "mtk_drm_gem.h"
25#include "mtk_drm_plane.h"
26
27static const u32 formats[] = {
28 DRM_FORMAT_XRGB8888,
29 DRM_FORMAT_ARGB8888,
30 DRM_FORMAT_RGB565,
31};
32
33static void mtk_plane_reset(struct drm_plane *plane)
34{
35 struct mtk_plane_state *state;
36
37 if (plane->state) {
38 __drm_atomic_helper_plane_destroy_state(plane->state);
39
40 state = to_mtk_plane_state(plane->state);
41 memset(state, 0, sizeof(*state));
42 } else {
43 state = kzalloc(sizeof(*state), GFP_KERNEL);
44 if (!state)
45 return;
46 plane->state = &state->base;
47 }
48
49 state->base.plane = plane;
50 state->pending.format = DRM_FORMAT_RGB565;
51}
52
53static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane)
54{
55 struct mtk_plane_state *old_state = to_mtk_plane_state(plane->state);
56 struct mtk_plane_state *state;
57
58 state = kzalloc(sizeof(*state), GFP_KERNEL);
59 if (!state)
60 return NULL;
61
62 __drm_atomic_helper_plane_duplicate_state(plane, &state->base);
63
64 WARN_ON(state->base.plane != plane);
65
66 state->pending = old_state->pending;
67
68 return &state->base;
69}
70
71static void mtk_drm_plane_destroy_state(struct drm_plane *plane,
72 struct drm_plane_state *state)
73{
74 __drm_atomic_helper_plane_destroy_state(state);
75 kfree(to_mtk_plane_state(state));
76}
77
78static const struct drm_plane_funcs mtk_plane_funcs = {
79 .update_plane = drm_atomic_helper_update_plane,
80 .disable_plane = drm_atomic_helper_disable_plane,
81 .destroy = drm_plane_cleanup,
82 .reset = mtk_plane_reset,
83 .atomic_duplicate_state = mtk_plane_duplicate_state,
84 .atomic_destroy_state = mtk_drm_plane_destroy_state,
85};
86
87static int mtk_plane_atomic_check(struct drm_plane *plane,
88 struct drm_plane_state *state)
89{
90 struct drm_framebuffer *fb = state->fb;
91 struct drm_crtc_state *crtc_state;
92 struct drm_rect clip = { 0, };
93
94 if (!fb)
95 return 0;
96
97 if (!mtk_fb_get_gem_obj(fb)) {
98 DRM_DEBUG_KMS("buffer is null\n");
99 return -EFAULT;
100 }
101
102 if (!state->crtc)
103 return 0;
104
105 crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
106 if (IS_ERR(crtc_state))
107 return PTR_ERR(crtc_state);
108
109 clip.x2 = crtc_state->mode.hdisplay;
110 clip.y2 = crtc_state->mode.vdisplay;
111
112 return drm_plane_helper_check_state(state, &clip,
113 DRM_PLANE_HELPER_NO_SCALING,
114 DRM_PLANE_HELPER_NO_SCALING,
115 true, true);
116}
117
118static void mtk_plane_atomic_update(struct drm_plane *plane,
119 struct drm_plane_state *old_state)
120{
121 struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
122 struct drm_crtc *crtc = plane->state->crtc;
123 struct drm_framebuffer *fb = plane->state->fb;
124 struct drm_gem_object *gem;
125 struct mtk_drm_gem_obj *mtk_gem;
126 unsigned int pitch, format;
127 dma_addr_t addr;
128
129 if (!crtc || WARN_ON(!fb))
130 return;
131
132 gem = mtk_fb_get_gem_obj(fb);
133 mtk_gem = to_mtk_gem_obj(gem);
134 addr = mtk_gem->dma_addr;
135 pitch = fb->pitches[0];
136 format = fb->format->format;
137
138 addr += (plane->state->src.x1 >> 16) * fb->format->cpp[0];
139 addr += (plane->state->src.y1 >> 16) * pitch;
140
141 state->pending.enable = true;
142 state->pending.pitch = pitch;
143 state->pending.format = format;
144 state->pending.addr = addr;
145 state->pending.x = plane->state->dst.x1;
146 state->pending.y = plane->state->dst.y1;
147 state->pending.width = drm_rect_width(&plane->state->dst);
148 state->pending.height = drm_rect_height(&plane->state->dst);
149 wmb(); /* Make sure the above parameters are set before update */
150 state->pending.dirty = true;
151}
152
153static void mtk_plane_atomic_disable(struct drm_plane *plane,
154 struct drm_plane_state *old_state)
155{
156 struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
157
158 state->pending.enable = false;
159 wmb(); /* Make sure the above parameter is set before update */
160 state->pending.dirty = true;
161}
162
163static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
164 .atomic_check = mtk_plane_atomic_check,
165 .atomic_update = mtk_plane_atomic_update,
166 .atomic_disable = mtk_plane_atomic_disable,
167};
168
169int mtk_plane_init(struct drm_device *dev, struct drm_plane *plane,
170 unsigned long possible_crtcs, enum drm_plane_type type)
171{
172 int err;
173
174 err = drm_universal_plane_init(dev, plane, possible_crtcs,
175 &mtk_plane_funcs, formats,
176 ARRAY_SIZE(formats), type, NULL);
177 if (err) {
178 DRM_ERROR("failed to initialize plane\n");
179 return err;
180 }
181
182 drm_plane_helper_add(plane, &mtk_plane_helper_funcs);
183
184 return 0;
185}