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 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 */
 99void 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}