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 
32 enum 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 
39 static 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 
49 int amdgpu_dm_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name,
50 			   size_t *values_cnt)
51 {
52 	struct dm_crtc_state *crtc_state = to_dm_crtc_state(crtc->state);
53 	struct dc_stream_state *stream_state = crtc_state->stream;
54 
55 	enum amdgpu_dm_pipe_crc_source source = dm_parse_crc_source(src_name);
56 
57 	if (source < 0) {
58 		DRM_DEBUG_DRIVER("Unknown CRC source %s for CRTC%d\n",
59 				 src_name, crtc->index);
60 		return -EINVAL;
61 	}
62 
63 	/* When enabling CRC, we should also disable dithering. */
64 	if (source == AMDGPU_DM_PIPE_CRC_SOURCE_AUTO) {
65 		if (dc_stream_configure_crc(stream_state->ctx->dc,
66 					    stream_state,
67 					    true, true)) {
68 			crtc_state->crc_enabled = true;
69 			dc_stream_set_dither_option(stream_state,
70 						    DITHER_OPTION_TRUN8);
71 		}
72 		else
73 			return -EINVAL;
74 	} else {
75 		if (dc_stream_configure_crc(stream_state->ctx->dc,
76 					    stream_state,
77 					    false, false)) {
78 			crtc_state->crc_enabled = false;
79 			dc_stream_set_dither_option(stream_state,
80 						    DITHER_OPTION_DEFAULT);
81 		}
82 		else
83 			return -EINVAL;
84 	}
85 
86 	*values_cnt = 3;
87 	/* Reset crc_skipped on dm state */
88 	crtc_state->crc_skip_count = 0;
89 	return 0;
90 }
91 
92 /**
93  * amdgpu_dm_crtc_handle_crc_irq: Report to DRM the CRC on given CRTC.
94  * @crtc: DRM CRTC object.
95  *
96  * This function should be called at the end of a vblank, when the fb has been
97  * fully processed through the pipe.
98  */
99 void amdgpu_dm_crtc_handle_crc_irq(struct drm_crtc *crtc)
100 {
101 	struct dm_crtc_state *crtc_state;
102 	struct dc_stream_state *stream_state;
103 	uint32_t crcs[3];
104 
105 	if (crtc == NULL)
106 		return;
107 
108 	crtc_state = to_dm_crtc_state(crtc->state);
109 	stream_state = crtc_state->stream;
110 
111 	/* Early return if CRC capture is not enabled. */
112 	if (!crtc_state->crc_enabled)
113 		return;
114 
115 	/*
116 	 * Since flipping and crc enablement happen asynchronously, we - more
117 	 * often than not - will be returning an 'uncooked' crc on first frame.
118 	 * Probably because hw isn't ready yet. For added security, skip the
119 	 * first two CRC values.
120 	 */
121 	if (crtc_state->crc_skip_count < 2) {
122 		crtc_state->crc_skip_count += 1;
123 		return;
124 	}
125 
126 	if (!dc_stream_get_crc(stream_state->ctx->dc, stream_state,
127 			       &crcs[0], &crcs[1], &crcs[2]))
128 		return;
129 
130 	drm_crtc_add_crc_entry(crtc, true,
131 			       drm_crtc_accurate_vblank_count(crtc), crcs);
132 }
133