Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/*
2 * Copyright 2015 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: AMD
23 *
24 */
25
26#include <drm/drm_crtc.h>
27#include <drm/drm_vblank.h>
28
29#include "amdgpu.h"
30#include "amdgpu_dm.h"
31#include "dc.h"
32
33enum amdgpu_dm_pipe_crc_source {
34 AMDGPU_DM_PIPE_CRC_SOURCE_NONE = 0,
35 AMDGPU_DM_PIPE_CRC_SOURCE_AUTO,
36 AMDGPU_DM_PIPE_CRC_SOURCE_MAX,
37 AMDGPU_DM_PIPE_CRC_SOURCE_INVALID = -1,
38};
39
40static enum amdgpu_dm_pipe_crc_source dm_parse_crc_source(const char *source)
41{
42 if (!source || !strcmp(source, "none"))
43 return AMDGPU_DM_PIPE_CRC_SOURCE_NONE;
44 if (!strcmp(source, "auto"))
45 return AMDGPU_DM_PIPE_CRC_SOURCE_AUTO;
46
47 return AMDGPU_DM_PIPE_CRC_SOURCE_INVALID;
48}
49
50int
51amdgpu_dm_crtc_verify_crc_source(struct drm_crtc *crtc, const char *src_name,
52 size_t *values_cnt)
53{
54 enum amdgpu_dm_pipe_crc_source source = dm_parse_crc_source(src_name);
55
56 if (source < 0) {
57 DRM_DEBUG_DRIVER("Unknown CRC source %s for CRTC%d\n",
58 src_name, crtc->index);
59 return -EINVAL;
60 }
61
62 *values_cnt = 3;
63 return 0;
64}
65
66int amdgpu_dm_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name)
67{
68 struct amdgpu_device *adev = crtc->dev->dev_private;
69 struct dm_crtc_state *crtc_state = to_dm_crtc_state(crtc->state);
70 struct dc_stream_state *stream_state = crtc_state->stream;
71 bool enable;
72
73 enum amdgpu_dm_pipe_crc_source source = dm_parse_crc_source(src_name);
74
75 if (source < 0) {
76 DRM_DEBUG_DRIVER("Unknown CRC source %s for CRTC%d\n",
77 src_name, crtc->index);
78 return -EINVAL;
79 }
80
81 if (!stream_state) {
82 DRM_ERROR("No stream state for CRTC%d\n", crtc->index);
83 return -EINVAL;
84 }
85
86 enable = (source == AMDGPU_DM_PIPE_CRC_SOURCE_AUTO);
87
88 mutex_lock(&adev->dm.dc_lock);
89 if (!dc_stream_configure_crc(stream_state->ctx->dc, stream_state,
90 enable, enable)) {
91 mutex_unlock(&adev->dm.dc_lock);
92 return -EINVAL;
93 }
94
95 /* When enabling CRC, we should also disable dithering. */
96 dc_stream_set_dither_option(stream_state,
97 enable ? DITHER_OPTION_TRUN8
98 : DITHER_OPTION_DEFAULT);
99
100 mutex_unlock(&adev->dm.dc_lock);
101
102 /*
103 * Reading the CRC requires the vblank interrupt handler to be
104 * enabled. Keep a reference until CRC capture stops.
105 */
106 if (!crtc_state->crc_enabled && enable)
107 drm_crtc_vblank_get(crtc);
108 else if (crtc_state->crc_enabled && !enable)
109 drm_crtc_vblank_put(crtc);
110
111 crtc_state->crc_enabled = enable;
112
113 /* Reset crc_skipped on dm state */
114 crtc_state->crc_skip_count = 0;
115 return 0;
116}
117
118/**
119 * amdgpu_dm_crtc_handle_crc_irq: Report to DRM the CRC on given CRTC.
120 * @crtc: DRM CRTC object.
121 *
122 * This function should be called at the end of a vblank, when the fb has been
123 * fully processed through the pipe.
124 */
125void amdgpu_dm_crtc_handle_crc_irq(struct drm_crtc *crtc)
126{
127 struct dm_crtc_state *crtc_state;
128 struct dc_stream_state *stream_state;
129 uint32_t crcs[3];
130
131 if (crtc == NULL)
132 return;
133
134 crtc_state = to_dm_crtc_state(crtc->state);
135 stream_state = crtc_state->stream;
136
137 /* Early return if CRC capture is not enabled. */
138 if (!crtc_state->crc_enabled)
139 return;
140
141 /*
142 * Since flipping and crc enablement happen asynchronously, we - more
143 * often than not - will be returning an 'uncooked' crc on first frame.
144 * Probably because hw isn't ready yet. For added security, skip the
145 * first two CRC values.
146 */
147 if (crtc_state->crc_skip_count < 2) {
148 crtc_state->crc_skip_count += 1;
149 return;
150 }
151
152 if (!dc_stream_get_crc(stream_state->ctx->dc, stream_state,
153 &crcs[0], &crcs[1], &crcs[2]))
154 return;
155
156 drm_crtc_add_crc_entry(crtc, true,
157 drm_crtc_accurate_vblank_count(crtc), crcs);
158}