drm/amd/display: Implement color management (303afd2d) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/gpu/drm/amd/display/amdgpu_dm/Makefile

+1 −1

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		@@ -25,7 +25,7 @@



		AMDGPUDM = amdgpu_dm.o amdgpu_dm_irq.o amdgpu_dm_mst_types.o
		AMDGPUDM = amdgpu_dm.o amdgpu_dm_irq.o amdgpu_dm_mst_types.o amdgpu_dm_color.o

		ifneq ($(CONFIG_DRM_AMD_DC),)
		AMDGPUDM += amdgpu_dm_services.o amdgpu_dm_helpers.o

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

+5 −0

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		@@ -268,6 +268,11 @@ void amdgpu_dm_crtc_handle_crc_irq(struct drm_crtc *crtc);
		#define amdgpu_dm_crtc_handle_crc_irq(x)
		#endif

		int amdgpu_dm_set_degamma_lut(struct drm_crtc_state *crtc_state,
		struct dc_plane_state *dc_plane_state);
		void amdgpu_dm_set_ctm(struct dm_crtc_state *crtc);
		int amdgpu_dm_set_regamma_lut(struct dm_crtc_state *crtc);

		extern const struct drm_encoder_helper_funcs amdgpu_dm_encoder_helper_funcs;

		#endif /* __AMDGPU_DM_H__ */

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

0 → 100644

+218 −0

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		/*
		* Copyright 2018 Advanced Micro Devices, Inc.
		*
		* Permission is hereby granted, free of charge, to any person obtaining a
		* copy of this software and associated documentation files (the "Software"),
		* to deal in the Software without restriction, including without limitation
		* the rights to use, copy, modify, merge, publish, distribute, sublicense,
		* and/or sell copies of the Software, and to permit persons to whom the
		* Software is furnished to do so, subject to the following conditions:
		*
		* The above copyright notice and this permission notice shall be included in
		* all copies or substantial portions of the Software.
		*
		* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
		* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
		* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
		* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
		* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
		* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
		* OTHER DEALINGS IN THE SOFTWARE.
		*
		* Authors: AMD
		*
		*/

		#include "amdgpu_mode.h"
		#include "amdgpu_dm.h"
		#include "modules/color/color_gamma.h"


		#define MAX_LUT_ENTRIES 256

		/*
		* Return true if the given lut is a linear mapping of values, i.e. it acts
		* like a bypass LUT.
		*
		* It is considered linear if the lut represents:
		* f(a) = (0xFF00/MAX_LUT_ENTRIES-1)a; for integer a in [0, MAX_LUT_ENTRIES)
		*/
		static bool __is_lut_linear(struct drm_color_lut *lut)
		{
		int i;
		uint32_t max_os = 0xFF00;
		uint32_t expected;
		int delta;

		for (i = 0; i < MAX_LUT_ENTRIES; i++) {
		/* All color values should equal */
		if ((lut[i].red != lut[i].green) \|\| (lut[i].green != lut[i].blue))
		return false;

		expected = i * max_os / (MAX_LUT_ENTRIES-1);

		/* Allow a +/-1 error. */
		delta = lut[i].red - expected;
		if (delta < -1 \|\| 1 < delta)
		return false;
		}
		return true;
		}

		/**
		* amdgpu_dm_set_regamma_lut: Set regamma lut for the given CRTC.
		* @crtc: amdgpu_dm crtc state
		*
		* Update the underlying dc_stream_state's output transfer function (OTF) in
		* preparation for hardware commit. If no lut is specified by user, we default
		* to SRGB.
		*
		* RETURNS:
		* 0 on success, -ENOMEM if memory cannot be allocated to calculate the OTF.
		*/
		int amdgpu_dm_set_regamma_lut(struct dm_crtc_state *crtc)
		{
		struct drm_property_blob *blob = crtc->base.gamma_lut;
		struct dc_stream_state *stream = crtc->stream;
		struct drm_color_lut *lut;
		struct dc_gamma *gamma;
		enum dc_transfer_func_type old_type = stream->out_transfer_func->type;

		uint32_t r, g, b;
		int i;
		bool ret;

		if (!blob) {
		/* By default, use the SRGB predefined curve.*/
		stream->out_transfer_func->type = TF_TYPE_PREDEFINED;
		stream->out_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
		return 0;
		}

		lut = (struct drm_color_lut *)blob->data;

		if (__is_lut_linear(lut)) {
		/* Set to bypass if lut is set to linear */
		stream->out_transfer_func->type = TF_TYPE_BYPASS;
		stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
		return 0;
		}

		gamma = dc_create_gamma();
		if (!gamma)
		return -ENOMEM;

		gamma->num_entries = MAX_LUT_ENTRIES;
		gamma->type = GAMMA_RGB_256;

		/* Truncate, and store in dc_gamma for output tf calculation */
		for (i = 0; i < gamma->num_entries; i++) {
		r = drm_color_lut_extract(lut[i].red, 16);
		g = drm_color_lut_extract(lut[i].green, 16);
		b = drm_color_lut_extract(lut[i].blue, 16);

		gamma->entries.red[i] = dal_fixed31_32_from_int(r);
		gamma->entries.green[i] = dal_fixed31_32_from_int(g);
		gamma->entries.blue[i] = dal_fixed31_32_from_int(b);
		}

		/* Call color module to translate into something DC understands. Namely
		* a transfer function.
		*/
		stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
		ret = mod_color_calculate_regamma_params(stream->out_transfer_func,
		gamma, true);
		dc_gamma_release(&gamma);
		if (!ret) {
		stream->out_transfer_func->type = old_type;
		DRM_ERROR("Out of memory when calculating regamma params\n");
		return -ENOMEM;
		}

		return 0;
		}

		/**
		* amdgpu_dm_set_ctm: Set the color transform matrix for the given CRTC.
		* @crtc: amdgpu_dm crtc state
		*
		* Update the underlying dc_stream_state's gamut remap matrix in preparation
		* for hardware commit. If no matrix is specified by user, gamut remap will be
		* disabled.
		*/
		void amdgpu_dm_set_ctm(struct dm_crtc_state *crtc)
		{

		struct drm_property_blob *blob = crtc->base.ctm;
		struct dc_stream_state *stream = crtc->stream;
		struct drm_color_ctm *ctm;
		int i;

		if (!blob) {
		stream->gamut_remap_matrix.enable_remap = false;
		return;
		}

		stream->gamut_remap_matrix.enable_remap = true;
		ctm = (struct drm_color_ctm *)blob->data;
		/*
		* DRM gives a 3x3 matrix, but DC wants 3x4. Assuming we're operating
		* with homogeneous coordinates, augment the matrix with 0's.
		*
		* The format provided is S31.32, which is the same as our fixed31_32.
		*/
		for (i = 0; i < 12; i++) {
		/* Skip 4th element */
		if (i % 4 == 3) {
		stream->gamut_remap_matrix.matrix[i] = dal_fixed31_32_zero;
		continue;
		}
		/* csc[i] = ctm[i - floor(i/4)] */
		stream->gamut_remap_matrix.matrix[i].value = ctm->matrix[i - (i/4)];
		}
		}


		/**
		* amdgpu_dm_set_degamma_lut: Set degamma lut for the given CRTC.
		* @crtc: amdgpu_dm crtc state
		*
		* Update the underlying dc_stream_state's input transfer function (ITF) in
		* preparation for hardware commit. If no lut is specified by user, we default
		* to SRGB degamma.
		*
		* Currently, we only support degamma bypass, or preprogrammed SRGB degamma.
		* Programmable degamma is not supported, and an attempt to do so will return
		* -EINVAL.
		*
		* RETURNS:
		* 0 on success, -EINVAL if custom degamma curve is given.
		*/
		int amdgpu_dm_set_degamma_lut(struct drm_crtc_state *crtc_state,
		struct dc_plane_state *dc_plane_state)
		{
		struct drm_property_blob *blob = crtc_state->degamma_lut;
		struct drm_color_lut *lut;

		if (!blob) {
		/* Default to SRGB */
		dc_plane_state->in_transfer_func->type = TF_TYPE_PREDEFINED;
		dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
		return 0;
		}

		lut = (struct drm_color_lut *)blob->data;
		if (__is_lut_linear(lut)) {
		dc_plane_state->in_transfer_func->type = TF_TYPE_BYPASS;
		dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
		return 0;
		}

		/* Otherwise, assume SRGB, since programmable degamma is not
		* supported.
		*/
		dc_plane_state->in_transfer_func->type = TF_TYPE_PREDEFINED;
		dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
		return -EINVAL;
		}