Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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
28#include "amdgpu.h"
29#include "amdgpu_dm.h"
30#include "dc.h"
31
32enum amdgpu_dm_pipe_crc_source {
33 AMDGPU_DM_PIPE_CRC_SOURCE_NONE = 0,
34 AMDGPU_DM_PIPE_CRC_SOURCE_AUTO,
35 AMDGPU_DM_PIPE_CRC_SOURCE_MAX,
36 AMDGPU_DM_PIPE_CRC_SOURCE_INVALID = -1,
37};
38
39static enum amdgpu_dm_pipe_crc_source dm_parse_crc_source(const char *source)
40{
41 if (!source || !strcmp(source, "none"))
42 return AMDGPU_DM_PIPE_CRC_SOURCE_NONE;
43 if (!strcmp(source, "auto"))
44 return AMDGPU_DM_PIPE_CRC_SOURCE_AUTO;
45
46 return AMDGPU_DM_PIPE_CRC_SOURCE_INVALID;
47}
48
49int
50amdgpu_dm_crtc_verify_crc_source(struct drm_crtc *crtc, const char *src_name,
51 size_t *values_cnt)
52{
53 enum amdgpu_dm_pipe_crc_source source = dm_parse_crc_source(src_name);
54
55 if (source < 0) {
56 DRM_DEBUG_DRIVER("Unknown CRC source %s for CRTC%d\n",
57 src_name, crtc->index);
58 return -EINVAL;
59 }
60
61 *values_cnt = 3;
62 return 0;
63}
64
65int amdgpu_dm_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name)
66{
67 struct amdgpu_device *adev = crtc->dev->dev_private;
68 struct dm_crtc_state *crtc_state = to_dm_crtc_state(crtc->state);
69 struct dc_stream_state *stream_state = crtc_state->stream;
70 bool enable;
71
72 enum amdgpu_dm_pipe_crc_source source = dm_parse_crc_source(src_name);
73
74 if (source < 0) {
75 DRM_DEBUG_DRIVER("Unknown CRC source %s for CRTC%d\n",
76 src_name, crtc->index);
77 return -EINVAL;
78 }
79
80 if (!stream_state) {
81 DRM_ERROR("No stream state for CRTC%d\n", crtc->index);
82 return -EINVAL;
83 }
84
85 enable = (source == AMDGPU_DM_PIPE_CRC_SOURCE_AUTO);
86
87 mutex_lock(&adev->dm.dc_lock);
88 if (!dc_stream_configure_crc(stream_state->ctx->dc, stream_state,
89 enable, enable)) {
90 mutex_unlock(&adev->dm.dc_lock);
91 return -EINVAL;
92 }
93
94 /* When enabling CRC, we should also disable dithering. */
95 dc_stream_set_dither_option(stream_state,
96 enable ? DITHER_OPTION_TRUN8
97 : DITHER_OPTION_DEFAULT);
98
99 mutex_unlock(&adev->dm.dc_lock);
100
101 /*
102 * Reading the CRC requires the vblank interrupt handler to be
103 * enabled. Keep a reference until CRC capture stops.
104 */
105 if (!crtc_state->crc_enabled && enable)
106 drm_crtc_vblank_get(crtc);
107 else if (crtc_state->crc_enabled && !enable)
108 drm_crtc_vblank_put(crtc);
109
110 crtc_state->crc_enabled = enable;
111
112 /* Reset crc_skipped on dm state */
113 crtc_state->crc_skip_count = 0;
114 return 0;
115}
116
117/**
118 * amdgpu_dm_crtc_handle_crc_irq: Report to DRM the CRC on given CRTC.
119 * @crtc: DRM CRTC object.
120 *
121 * This function should be called at the end of a vblank, when the fb has been
122 * fully processed through the pipe.
123 */
124void amdgpu_dm_crtc_handle_crc_irq(struct drm_crtc *crtc)
125{
126 struct dm_crtc_state *crtc_state;
127 struct dc_stream_state *stream_state;
128 uint32_t crcs[3];
129
130 if (crtc == NULL)
131 return;
132
133 crtc_state = to_dm_crtc_state(crtc->state);
134 stream_state = crtc_state->stream;
135
136 /* Early return if CRC capture is not enabled. */
137 if (!crtc_state->crc_enabled)
138 return;
139
140 /*
141 * Since flipping and crc enablement happen asynchronously, we - more
142 * often than not - will be returning an 'uncooked' crc on first frame.
143 * Probably because hw isn't ready yet. For added security, skip the
144 * first two CRC values.
145 */
146 if (crtc_state->crc_skip_count < 2) {
147 crtc_state->crc_skip_count += 1;
148 return;
149 }
150
151 if (!dc_stream_get_crc(stream_state->ctx->dc, stream_state,
152 &crcs[0], &crcs[1], &crcs[2]))
153 return;
154
155 drm_crtc_add_crc_entry(crtc, true,
156 drm_crtc_accurate_vblank_count(crtc), crcs);
157}