drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c

   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 = to_dm_crtc_state(crtc->state);
 102         struct dc_stream_state *stream_state = crtc_state->stream;
 103         uint32_t crcs[3];
 104
 105         /* Early return if CRC capture is not enabled. */
 106         if (!crtc_state->crc_enabled)
 107                 return;
 108
 109         /*
 110          * Since flipping and crc enablement happen asynchronously, we - more
 111          * often than not - will be returning an 'uncooked' crc on first frame.
 112          * Probably because hw isn't ready yet. For added security, skip the
 113          * first two CRC values.
 114          */
 115         if (crtc_state->crc_skip_count < 2) {
 116                 crtc_state->crc_skip_count += 1;
 117                 return;
 118         }
 119
 120         if (!dc_stream_get_crc(stream_state->ctx->dc, stream_state,
 121                                &crcs[0], &crcs[1], &crcs[2]))
 122                 return;
 123
 124         drm_crtc_add_crc_entry(crtc, true,
 125                                drm_crtc_accurate_vblank_count(crtc), crcs);
 126 }