2 * Copyright 2018 Advanced Micro Devices, Inc.
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26 #include "amdgpu_mode.h"
27 #include "amdgpu_dm.h"
29 #include "modules/color/color_gamma.h"
30 #include "basics/conversion.h"
33 * The DC interface to HW gives us the following color management blocks
36 * - Input gamma LUT (de-normalized)
37 * - Input CSC (normalized)
38 * - Surface degamma LUT (normalized)
39 * - Surface CSC (normalized)
40 * - Surface regamma LUT (normalized)
41 * - Output CSC (normalized)
43 * But these aren't a direct mapping to DRM color properties. The current DRM
44 * interface exposes CRTC degamma, CRTC CTM and CRTC regamma while our hardware
45 * is essentially giving:
47 * Plane CTM -> Plane degamma -> Plane CTM -> Plane regamma -> Plane CTM
49 * The input gamma LUT block isn't really applicable here since it operates
50 * on the actual input data itself rather than the HW fp representation. The
51 * input and output CSC blocks are technically available to use as part of
52 * the DC interface but are typically used internally by DC for conversions
53 * between color spaces. These could be blended together with user
54 * adjustments in the future but for now these should remain untouched.
56 * The pipe blending also happens after these blocks so we don't actually
57 * support any CRTC props with correct blending with multiple planes - but we
58 * can still support CRTC color management properties in DM in most single
59 * plane cases correctly with clever management of the DC interface in DM.
61 * As per DRM documentation, blocks should be in hardware bypass when their
62 * respective property is set to NULL. A linear DGM/RGM LUT should also
63 * considered as putting the respective block into bypass mode.
65 * This means that the following
66 * configuration is assumed to be the default:
68 * Plane DGM Bypass -> Plane CTM Bypass -> Plane RGM Bypass -> ...
69 * CRTC DGM Bypass -> CRTC CTM Bypass -> CRTC RGM Bypass
72 #define MAX_DRM_LUT_VALUE 0xFFFF
75 * Initialize the color module.
77 * We're not using the full color module, only certain components.
78 * Only call setup functions for components that we need.
80 void amdgpu_dm_init_color_mod(void)
82 setup_x_points_distribution();
85 /* Extracts the DRM lut and lut size from a blob. */
86 static const struct drm_color_lut *
87 __extract_blob_lut(const struct drm_property_blob *blob, uint32_t *size)
89 *size = blob ? drm_color_lut_size(blob) : 0;
90 return blob ? (struct drm_color_lut *)blob->data : NULL;
94 * Return true if the given lut is a linear mapping of values, i.e. it acts
97 * It is considered linear if the lut represents:
98 * f(a) = (0xFF00/MAX_COLOR_LUT_ENTRIES-1)a; for integer a in
99 * [0, MAX_COLOR_LUT_ENTRIES)
101 static bool __is_lut_linear(const struct drm_color_lut *lut, uint32_t size)
107 for (i = 0; i < size; i++) {
108 /* All color values should equal */
109 if ((lut[i].red != lut[i].green) || (lut[i].green != lut[i].blue))
112 expected = i * MAX_DRM_LUT_VALUE / (size-1);
114 /* Allow a +/-1 error. */
115 delta = lut[i].red - expected;
116 if (delta < -1 || 1 < delta)
123 * Convert the drm_color_lut to dc_gamma. The conversion depends on the size
124 * of the lut - whether or not it's legacy.
126 static void __drm_lut_to_dc_gamma(const struct drm_color_lut *lut,
127 struct dc_gamma *gamma, bool is_legacy)
133 for (i = 0; i < MAX_COLOR_LEGACY_LUT_ENTRIES; i++) {
134 r = drm_color_lut_extract(lut[i].red, 16);
135 g = drm_color_lut_extract(lut[i].green, 16);
136 b = drm_color_lut_extract(lut[i].blue, 16);
138 gamma->entries.red[i] = dc_fixpt_from_int(r);
139 gamma->entries.green[i] = dc_fixpt_from_int(g);
140 gamma->entries.blue[i] = dc_fixpt_from_int(b);
146 for (i = 0; i < MAX_COLOR_LUT_ENTRIES; i++) {
147 r = drm_color_lut_extract(lut[i].red, 16);
148 g = drm_color_lut_extract(lut[i].green, 16);
149 b = drm_color_lut_extract(lut[i].blue, 16);
151 gamma->entries.red[i] = dc_fixpt_from_fraction(r, MAX_DRM_LUT_VALUE);
152 gamma->entries.green[i] = dc_fixpt_from_fraction(g, MAX_DRM_LUT_VALUE);
153 gamma->entries.blue[i] = dc_fixpt_from_fraction(b, MAX_DRM_LUT_VALUE);
158 * Converts a DRM CTM to a DC CSC float matrix.
159 * The matrix needs to be a 3x4 (12 entry) matrix.
161 static void __drm_ctm_to_dc_matrix(const struct drm_color_ctm *ctm,
162 struct fixed31_32 *matrix)
168 * DRM gives a 3x3 matrix, but DC wants 3x4. Assuming we're operating
169 * with homogeneous coordinates, augment the matrix with 0's.
171 * The format provided is S31.32, using signed-magnitude representation.
172 * Our fixed31_32 is also S31.32, but is using 2's complement. We have
173 * to convert from signed-magnitude to 2's complement.
175 for (i = 0; i < 12; i++) {
176 /* Skip 4th element */
178 matrix[i] = dc_fixpt_zero;
182 /* gamut_remap_matrix[i] = ctm[i - floor(i/4)] */
183 val = ctm->matrix[i - (i / 4)];
184 /* If negative, convert to 2's complement. */
185 if (val & (1ULL << 63))
186 val = -(val & ~(1ULL << 63));
188 matrix[i].value = val;
192 /* Calculates the legacy transfer function - only for sRGB input space. */
193 static int __set_legacy_tf(struct dc_transfer_func *func,
194 const struct drm_color_lut *lut, uint32_t lut_size,
197 struct dc_gamma *gamma = NULL;
200 ASSERT(lut && lut_size == MAX_COLOR_LEGACY_LUT_ENTRIES);
202 gamma = dc_create_gamma();
206 gamma->type = GAMMA_RGB_256;
207 gamma->num_entries = lut_size;
208 __drm_lut_to_dc_gamma(lut, gamma, true);
210 res = mod_color_calculate_regamma_params(func, gamma, true, has_rom,
213 return res ? 0 : -ENOMEM;
216 /* Calculates the output transfer function based on expected input space. */
217 static int __set_output_tf(struct dc_transfer_func *func,
218 const struct drm_color_lut *lut, uint32_t lut_size,
221 struct dc_gamma *gamma = NULL;
224 ASSERT(lut && lut_size == MAX_COLOR_LUT_ENTRIES);
226 gamma = dc_create_gamma();
230 gamma->num_entries = lut_size;
231 __drm_lut_to_dc_gamma(lut, gamma, false);
233 if (func->tf == TRANSFER_FUNCTION_LINEAR) {
235 * Color module doesn't like calculating regamma params
236 * on top of a linear input. But degamma params can be used
237 * instead to simulate this.
239 gamma->type = GAMMA_CUSTOM;
240 res = mod_color_calculate_degamma_params(func, gamma, true);
243 * Assume sRGB. The actual mapping will depend on whether the
244 * input was legacy or not.
246 gamma->type = GAMMA_CS_TFM_1D;
247 res = mod_color_calculate_regamma_params(func, gamma, false,
251 dc_gamma_release(&gamma);
253 return res ? 0 : -ENOMEM;
256 /* Caculates the input transfer function based on expected input space. */
257 static int __set_input_tf(struct dc_transfer_func *func,
258 const struct drm_color_lut *lut, uint32_t lut_size)
260 struct dc_gamma *gamma = NULL;
263 gamma = dc_create_gamma();
267 gamma->type = GAMMA_CUSTOM;
268 gamma->num_entries = lut_size;
270 __drm_lut_to_dc_gamma(lut, gamma, false);
272 res = mod_color_calculate_degamma_params(func, gamma, true);
273 dc_gamma_release(&gamma);
275 return res ? 0 : -ENOMEM;
279 * amdgpu_dm_update_crtc_color_mgmt: Maps DRM color management to DC stream.
280 * @crtc: amdgpu_dm crtc state
282 * With no plane level color management properties we're free to use any
283 * of the HW blocks as long as the CRTC CTM always comes before the
284 * CRTC RGM and after the CRTC DGM.
286 * The CRTC RGM block will be placed in the RGM LUT block if it is non-linear.
287 * The CRTC DGM block will be placed in the DGM LUT block if it is non-linear.
288 * The CRTC CTM will be placed in the gamut remap block if it is non-linear.
290 * The RGM block is typically more fully featured and accurate across
291 * all ASICs - DCE can't support a custom non-linear CRTC DGM.
293 * For supporting both plane level color management and CRTC level color
294 * management at once we have to either restrict the usage of CRTC properties
295 * or blend adjustments together.
297 * Returns 0 on success.
299 int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc)
301 struct dc_stream_state *stream = crtc->stream;
302 struct amdgpu_device *adev =
303 (struct amdgpu_device *)crtc->base.state->dev->dev_private;
304 bool has_rom = adev->asic_type <= CHIP_RAVEN;
305 struct drm_color_ctm *ctm = NULL;
306 const struct drm_color_lut *degamma_lut, *regamma_lut;
307 uint32_t degamma_size, regamma_size;
308 bool has_regamma, has_degamma;
312 degamma_lut = __extract_blob_lut(crtc->base.degamma_lut, °amma_size);
313 if (degamma_lut && degamma_size != MAX_COLOR_LUT_ENTRIES)
316 regamma_lut = __extract_blob_lut(crtc->base.gamma_lut, ®amma_size);
317 if (regamma_lut && regamma_size != MAX_COLOR_LUT_ENTRIES &&
318 regamma_size != MAX_COLOR_LEGACY_LUT_ENTRIES)
322 degamma_lut && !__is_lut_linear(degamma_lut, degamma_size);
325 regamma_lut && !__is_lut_linear(regamma_lut, regamma_size);
327 is_legacy = regamma_size == MAX_COLOR_LEGACY_LUT_ENTRIES;
329 /* Reset all adjustments. */
330 crtc->cm_has_degamma = false;
331 crtc->cm_is_degamma_srgb = false;
333 /* Setup regamma and degamma. */
336 * Legacy regamma forces us to use the sRGB RGM as a base.
337 * This also means we can't use linear DGM since DGM needs
338 * to use sRGB as a base as well, resulting in incorrect CRTC
341 * TODO: Just map this to the standard regamma interface
342 * instead since this isn't really right. One of the cases
343 * where this setup currently fails is trying to do an
344 * inverse color ramp in legacy userspace.
346 crtc->cm_is_degamma_srgb = true;
347 stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
348 stream->out_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
350 r = __set_legacy_tf(stream->out_transfer_func, regamma_lut,
351 regamma_size, has_rom);
354 } else if (has_regamma) {
355 /* CRTC RGM goes into RGM LUT. */
356 stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
357 stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
359 r = __set_output_tf(stream->out_transfer_func, regamma_lut,
360 regamma_size, has_rom);
365 * No CRTC RGM means we can just put the block into bypass
366 * since we don't have any plane level adjustments using it.
368 stream->out_transfer_func->type = TF_TYPE_BYPASS;
369 stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
373 * CRTC DGM goes into DGM LUT. It would be nice to place it
374 * into the RGM since it's a more featured block but we'd
375 * have to place the CTM in the OCSC in that case.
377 crtc->cm_has_degamma = has_degamma;
379 /* Setup CRTC CTM. */
380 if (crtc->base.ctm) {
381 ctm = (struct drm_color_ctm *)crtc->base.ctm->data;
384 * Gamut remapping must be used for gamma correction
385 * since it comes before the regamma correction.
387 * OCSC could be used for gamma correction, but we'd need to
388 * blend the adjustments together with the required output
389 * conversion matrix - so just use the gamut remap block
392 __drm_ctm_to_dc_matrix(ctm, stream->gamut_remap_matrix.matrix);
394 stream->gamut_remap_matrix.enable_remap = true;
395 stream->csc_color_matrix.enable_adjustment = false;
398 stream->gamut_remap_matrix.enable_remap = false;
399 stream->csc_color_matrix.enable_adjustment = false;
406 * amdgpu_dm_update_plane_color_mgmt: Maps DRM color management to DC plane.
407 * @crtc: amdgpu_dm crtc state
408 * @ dc_plane_state: target DC surface
410 * Update the underlying dc_stream_state's input transfer function (ITF) in
411 * preparation for hardware commit. The transfer function used depends on
412 * the prepartion done on the stream for color management.
414 * Returns 0 on success.
416 int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
417 struct dc_plane_state *dc_plane_state)
419 const struct drm_color_lut *degamma_lut;
420 uint32_t degamma_size;
423 if (crtc->cm_has_degamma) {
424 degamma_lut = __extract_blob_lut(crtc->base.degamma_lut,
426 ASSERT(degamma_size == MAX_COLOR_LUT_ENTRIES);
428 dc_plane_state->in_transfer_func->type =
429 TF_TYPE_DISTRIBUTED_POINTS;
432 * This case isn't fully correct, but also fairly
433 * uncommon. This is userspace trying to use a
434 * legacy gamma LUT + atomic degamma LUT
437 * Legacy gamma requires the input to be in linear
438 * space, so that means we need to apply an sRGB
439 * degamma. But color module also doesn't support
440 * a user ramp in this case so the degamma will
443 * Even if we did support it, it's still not right:
445 * Input -> CRTC DGM -> sRGB DGM -> CRTC CTM ->
446 * sRGB RGM -> CRTC RGM -> Output
448 * The CSC will be done in the wrong space since
449 * we're applying an sRGB DGM on top of the CRTC
452 * TODO: Don't use the legacy gamma interface and just
453 * map these to the atomic one instead.
455 if (crtc->cm_is_degamma_srgb)
456 dc_plane_state->in_transfer_func->tf =
457 TRANSFER_FUNCTION_SRGB;
459 dc_plane_state->in_transfer_func->tf =
460 TRANSFER_FUNCTION_LINEAR;
462 r = __set_input_tf(dc_plane_state->in_transfer_func,
463 degamma_lut, degamma_size);
466 } else if (crtc->cm_is_degamma_srgb) {
468 * For legacy gamma support we need the regamma input
469 * in linear space. Assume that the input is sRGB.
471 dc_plane_state->in_transfer_func->type = TF_TYPE_PREDEFINED;
472 dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
474 /* ...Otherwise we can just bypass the DGM block. */
475 dc_plane_state->in_transfer_func->type = TF_TYPE_BYPASS;
476 dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;