1 /*
2 * Copyright (C) 2022 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "drmhwc"
18
19 #include "HwcDisplayConfigs.h"
20
21 #include <cmath>
22 #include <cstring>
23
24 #include "drm/DrmConnector.h"
25 #include "utils/log.h"
26 #include "utils/properties.h"
27
28 constexpr uint32_t kHeadlessModeDisplayWidthMm = 163;
29 constexpr uint32_t kHeadlessModeDisplayHeightMm = 122;
30 constexpr uint32_t kHeadlessModeDisplayWidthPx = 1024;
31 constexpr uint32_t kHeadlessModeDisplayHeightPx = 768;
32 constexpr uint32_t kHeadlessModeDisplayVRefresh = 60;
33 constexpr uint32_t kSyncLen = 10;
34 constexpr uint32_t kBackPorch = 10;
35 constexpr uint32_t kFrontPorch = 10;
36 constexpr uint32_t kHzInKHz = 1000;
37
38 namespace android {
39
40 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
41 uint32_t HwcDisplayConfigs::last_config_id = 1;
42
GenFakeMode(uint16_t width,uint16_t height)43 void HwcDisplayConfigs::GenFakeMode(uint16_t width, uint16_t height) {
44 hwc_configs.clear();
45
46 last_config_id++;
47 preferred_config_id = active_config_id = last_config_id;
48 auto headless_drm_mode_info = (drmModeModeInfo){
49 .hdisplay = width,
50 .vdisplay = height,
51 .vrefresh = kHeadlessModeDisplayVRefresh,
52 .name = "VIRTUAL-MODE",
53 };
54
55 if (width == 0 || height == 0) {
56 strcpy(headless_drm_mode_info.name, "HEADLESS-MODE");
57 headless_drm_mode_info.hdisplay = kHeadlessModeDisplayWidthPx;
58 headless_drm_mode_info.vdisplay = kHeadlessModeDisplayHeightPx;
59 }
60
61 /* We need a valid mode to pass the kernel validation */
62
63 headless_drm_mode_info.hsync_start = headless_drm_mode_info.hdisplay +
64 kFrontPorch;
65 headless_drm_mode_info.hsync_end = headless_drm_mode_info.hsync_start +
66 kSyncLen;
67 headless_drm_mode_info.htotal = headless_drm_mode_info.hsync_end + kBackPorch;
68
69 headless_drm_mode_info.vsync_start = headless_drm_mode_info.vdisplay +
70 kFrontPorch;
71 headless_drm_mode_info.vsync_end = headless_drm_mode_info.vsync_start +
72 kSyncLen;
73 headless_drm_mode_info.vtotal = headless_drm_mode_info.vsync_end + kBackPorch;
74
75 headless_drm_mode_info.clock = (headless_drm_mode_info.htotal *
76 headless_drm_mode_info.vtotal *
77 headless_drm_mode_info.vrefresh) /
78 kHzInKHz;
79
80 hwc_configs[active_config_id] = (HwcDisplayConfig){
81 .id = active_config_id,
82 .group_id = 1,
83 .mode = DrmMode(&headless_drm_mode_info),
84 };
85
86 mm_width = kHeadlessModeDisplayWidthMm;
87 mm_height = kHeadlessModeDisplayHeightMm;
88 }
89
90 // NOLINTNEXTLINE (readability-function-cognitive-complexity): Fixme
Update(DrmConnector & connector)91 HWC2::Error HwcDisplayConfigs::Update(DrmConnector &connector) {
92 /* In case UpdateModes will fail we will still have one mode for headless
93 * mode
94 */
95 GenFakeMode(0, 0);
96 /* Read real configs */
97 auto ret = connector.UpdateModes();
98 if (ret != 0) {
99 ALOGE("Failed to update display modes %d", ret);
100 return HWC2::Error::BadDisplay;
101 }
102
103 if (connector.GetModes().empty()) {
104 ALOGE("No modes reported by KMS");
105 return HWC2::Error::BadDisplay;
106 }
107
108 hwc_configs.clear();
109 mm_width = connector.GetMmWidth();
110 mm_height = connector.GetMmHeight();
111
112 preferred_config_id = 0;
113 uint32_t preferred_config_group_id = 0;
114
115 auto first_config_id = last_config_id;
116 uint32_t last_group_id = 1;
117 const bool use_config_groups = Properties::UseConfigGroups();
118
119 /* Group modes */
120 for (const auto &mode : connector.GetModes()) {
121 /* Find group for the new mode or create new group */
122 uint32_t group_found = 0;
123 if (use_config_groups) {
124 for (auto &hwc_config : hwc_configs) {
125 if (mode.GetRawMode().hdisplay ==
126 hwc_config.second.mode.GetRawMode().hdisplay &&
127 mode.GetRawMode().vdisplay ==
128 hwc_config.second.mode.GetRawMode().vdisplay) {
129 group_found = hwc_config.second.group_id;
130 }
131 }
132 }
133 if (group_found == 0) {
134 group_found = last_group_id++;
135 }
136
137 bool disabled = false;
138 if ((mode.GetRawMode().flags & DRM_MODE_FLAG_3D_MASK) != 0) {
139 ALOGI("Disabling display mode %s (Modes with 3D flag aren't supported)",
140 mode.GetName().c_str());
141 disabled = true;
142 }
143
144 /* Add config */
145 hwc_configs[last_config_id] = {
146 .id = last_config_id,
147 .group_id = group_found,
148 .mode = mode,
149 .disabled = disabled,
150 };
151
152 /* Chwck if the mode is preferred */
153 if ((mode.GetRawMode().type & DRM_MODE_TYPE_PREFERRED) != 0 &&
154 preferred_config_id == 0) {
155 preferred_config_id = last_config_id;
156 preferred_config_group_id = group_found;
157 }
158
159 last_config_id++;
160 }
161
162 /* We must have preferred mode. Set first mode as preferred
163 * in case KMS haven't reported anything. */
164 if (preferred_config_id == 0) {
165 preferred_config_id = first_config_id;
166 preferred_config_group_id = 1;
167 }
168
169 for (uint32_t group = 1; group < last_group_id; group++) {
170 bool has_interlaced = false;
171 bool has_progressive = false;
172 for (auto &hwc_config : hwc_configs) {
173 if (hwc_config.second.group_id != group || hwc_config.second.disabled) {
174 continue;
175 }
176
177 if (hwc_config.second.IsInterlaced()) {
178 has_interlaced = true;
179 } else {
180 has_progressive = true;
181 }
182 }
183
184 auto has_both = has_interlaced && has_progressive;
185 if (!has_both) {
186 continue;
187 }
188
189 bool group_contains_preferred_interlaced = false;
190 if (group == preferred_config_group_id &&
191 hwc_configs[preferred_config_id].IsInterlaced()) {
192 group_contains_preferred_interlaced = true;
193 }
194
195 for (auto &hwc_config : hwc_configs) {
196 if (hwc_config.second.group_id != group || hwc_config.second.disabled) {
197 continue;
198 }
199
200 auto disable = group_contains_preferred_interlaced
201 ? !hwc_config.second.IsInterlaced()
202 : hwc_config.second.IsInterlaced();
203
204 if (disable) {
205 ALOGI(
206 "Group %i: Disabling display mode %s (This group should consist "
207 "of %s modes)",
208 group, hwc_config.second.mode.GetName().c_str(),
209 group_contains_preferred_interlaced ? "interlaced" : "progressive");
210
211 hwc_config.second.disabled = true;
212 }
213 }
214 }
215
216 /* Group should not contain 2 modes with FPS delta less than ~1HZ
217 * otherwise android.graphics.cts.SetFrameRateTest CTS will fail
218 */
219 constexpr float kMinFpsDelta = 1.0; // FPS
220 for (uint32_t m1 = first_config_id; m1 < last_config_id; m1++) {
221 for (uint32_t m2 = first_config_id; m2 < last_config_id; m2++) {
222 if (m1 != m2 && hwc_configs[m1].group_id == hwc_configs[m2].group_id &&
223 !hwc_configs[m1].disabled && !hwc_configs[m2].disabled &&
224 fabsf(hwc_configs[m1].mode.GetVRefresh() -
225 hwc_configs[m2].mode.GetVRefresh()) < kMinFpsDelta) {
226 ALOGI(
227 "Group %i: Disabling display mode %s (Refresh rate value is "
228 "too close to existing mode %s)",
229 hwc_configs[m2].group_id, hwc_configs[m2].mode.GetName().c_str(),
230 hwc_configs[m1].mode.GetName().c_str());
231
232 hwc_configs[m2].disabled = true;
233 }
234 }
235 }
236
237 return HWC2::Error::None;
238 }
239
240 } // namespace android
241