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 bool enable; 55 56 enum amdgpu_dm_pipe_crc_source source = dm_parse_crc_source(src_name); 57 58 if (source < 0) { 59 DRM_DEBUG_DRIVER("Unknown CRC source %s for CRTC%d\n", 60 src_name, crtc->index); 61 return -EINVAL; 62 } 63 64 if (!stream_state) { 65 DRM_ERROR("No stream state for CRTC%d\n", crtc->index); 66 return -EINVAL; 67 } 68 69 enable = (source == AMDGPU_DM_PIPE_CRC_SOURCE_AUTO); 70 71 if (!dc_stream_configure_crc(stream_state->ctx->dc, stream_state, 72 enable, enable)) 73 return -EINVAL; 74 75 /* When enabling CRC, we should also disable dithering. */ 76 dc_stream_set_dither_option(stream_state, 77 enable ? DITHER_OPTION_TRUN8 78 : DITHER_OPTION_DEFAULT); 79 80 /* 81 * Reading the CRC requires the vblank interrupt handler to be 82 * enabled. Keep a reference until CRC capture stops. 83 */ 84 if (!crtc_state->crc_enabled && enable) 85 drm_crtc_vblank_get(crtc); 86 else if (crtc_state->crc_enabled && !enable) 87 drm_crtc_vblank_put(crtc); 88 89 crtc_state->crc_enabled = enable; 90 91 *values_cnt = 3; 92 /* Reset crc_skipped on dm state */ 93 crtc_state->crc_skip_count = 0; 94 return 0; 95 } 96 97 /** 98 * amdgpu_dm_crtc_handle_crc_irq: Report to DRM the CRC on given CRTC. 99 * @crtc: DRM CRTC object. 100 * 101 * This function should be called at the end of a vblank, when the fb has been 102 * fully processed through the pipe. 103 */ 104 void amdgpu_dm_crtc_handle_crc_irq(struct drm_crtc *crtc) 105 { 106 struct dm_crtc_state *crtc_state; 107 struct dc_stream_state *stream_state; 108 uint32_t crcs[3]; 109 110 if (crtc == NULL) 111 return; 112 113 crtc_state = to_dm_crtc_state(crtc->state); 114 stream_state = crtc_state->stream; 115 116 /* Early return if CRC capture is not enabled. */ 117 if (!crtc_state->crc_enabled) 118 return; 119 120 /* 121 * Since flipping and crc enablement happen asynchronously, we - more 122 * often than not - will be returning an 'uncooked' crc on first frame. 123 * Probably because hw isn't ready yet. For added security, skip the 124 * first two CRC values. 125 */ 126 if (crtc_state->crc_skip_count < 2) { 127 crtc_state->crc_skip_count += 1; 128 return; 129 } 130 131 if (!dc_stream_get_crc(stream_state->ctx->dc, stream_state, 132 &crcs[0], &crcs[1], &crcs[2])) 133 return; 134 135 drm_crtc_add_crc_entry(crtc, true, 136 drm_crtc_accurate_vblank_count(crtc), crcs); 137 } 138