1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
new file mode 100644
index 000000000000..f6cb502c303f
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
@@ -0,0 +1,274 @@
+/*
+ * 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_DRM_LUT_VALUE 0xFFFF
+
+/*
+ * Initialize the color module.
+ *
+ * We're not using the full color module, only certain components.
+ * Only call setup functions for components that we need.
+ */
+void amdgpu_dm_init_color_mod(void)
+{
+	setup_x_points_distribution();
+}
+
+
+/*
+ * 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_COLOR_LUT_ENTRIES-1)a; for integer a in
+ *                                           [0, MAX_COLOR_LUT_ENTRIES)
+ */
+static bool __is_lut_linear(struct drm_color_lut *lut, uint32_t size)
+{
+	int i;
+	uint32_t expected;
+	int delta;
+
+	for (i = 0; i < size; i++) {
+		/* All color values should equal */
+		if ((lut[i].red != lut[i].green) || (lut[i].green != lut[i].blue))
+			return false;
+
+		expected = i * MAX_DRM_LUT_VALUE / (size-1);
+
+		/* Allow a +/-1 error. */
+		delta = lut[i].red - expected;
+		if (delta < -1 || 1 < delta)
+			return false;
+	}
+	return true;
+}
+
+/**
+ * Convert the drm_color_lut to dc_gamma. The conversion depends on the size
+ * of the lut - whether or not it's legacy.
+ */
+static void __drm_lut_to_dc_gamma(struct drm_color_lut *lut,
+				  struct dc_gamma *gamma,
+				  bool is_legacy)
+{
+	uint32_t r, g, b;
+	int i;
+
+	if (is_legacy) {
+		for (i = 0; i < MAX_COLOR_LEGACY_LUT_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);
+		}
+		return;
+	}
+
+	/* else */
+	for (i = 0; i < MAX_COLOR_LUT_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_fraction(r, MAX_DRM_LUT_VALUE);
+		gamma->entries.green[i] = dal_fixed31_32_from_fraction(g, MAX_DRM_LUT_VALUE);
+		gamma->entries.blue[i] = dal_fixed31_32_from_fraction(b, MAX_DRM_LUT_VALUE);
+	}
+}
+
+/**
+ * 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;
+	uint32_t lut_size;
+	struct dc_gamma *gamma;
+	enum dc_transfer_func_type old_type = stream->out_transfer_func->type;
+
+	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;
+	lut_size = blob->length / sizeof(struct drm_color_lut);
+
+	if (__is_lut_linear(lut, lut_size)) {
+		/* 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 = lut_size;
+	if (gamma->num_entries == MAX_COLOR_LEGACY_LUT_ENTRIES)
+		gamma->type = GAMMA_RGB_256;
+	else if (gamma->num_entries == MAX_COLOR_LUT_ENTRIES)
+		gamma->type = GAMMA_CS_TFM_1D;
+	else {
+		/* Invalid lut size */
+		dc_gamma_release(&gamma);
+		return -EINVAL;
+	}
+
+	/* Convert drm_lut into dc_gamma */
+	__drm_lut_to_dc_gamma(lut, gamma, gamma->type == GAMMA_RGB_256);
+
+	/* 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;
+	int64_t val;
+	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, using signed-magnitude representation.
+	 * Our fixed31_32 is also S31.32, but is using 2's complement. We have
+	 * to convert from signed-magnitude to 2's complement.
+	 */
+	for (i = 0; i < 12; i++) {
+		/* Skip 4th element */
+		if (i % 4 == 3) {
+			stream->gamut_remap_matrix.matrix[i] = dal_fixed31_32_zero;
+			continue;
+		}
+
+		/* gamut_remap_matrix[i] = ctm[i - floor(i/4)] */
+		val = ctm->matrix[i - (i/4)];
+		/* If negative, convert to 2's complement. */
+		if (val & (1ULL << 63))
+			val = -(val & ~(1ULL << 63));
+
+		stream->gamut_remap_matrix.matrix[i].value = val;
+	}
+}
+
+
+/**
+ * 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, MAX_COLOR_LUT_ENTRIES)) {
+		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;
+}
+