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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.h"
#include "amdgpu_mode.h"
#include "amdgpu_dm.h"
#include "dc.h"
#include "modules/color/color_gamma.h"
#include "basics/conversion.h"
/*
* The DC interface to HW gives us the following color management blocks
* per pipe (surface):
*
* - Input gamma LUT (de-normalized)
* - Input CSC (normalized)
* - Surface degamma LUT (normalized)
* - Surface CSC (normalized)
* - Surface regamma LUT (normalized)
* - Output CSC (normalized)
*
* But these aren't a direct mapping to DRM color properties. The current DRM
* interface exposes CRTC degamma, CRTC CTM and CRTC regamma while our hardware
* is essentially giving:
*
* Plane CTM -> Plane degamma -> Plane CTM -> Plane regamma -> Plane CTM
*
* The input gamma LUT block isn't really applicable here since it operates
* on the actual input data itself rather than the HW fp representation. The
* input and output CSC blocks are technically available to use as part of
* the DC interface but are typically used internally by DC for conversions
* between color spaces. These could be blended together with user
* adjustments in the future but for now these should remain untouched.
*
* The pipe blending also happens after these blocks so we don't actually
* support any CRTC props with correct blending with multiple planes - but we
* can still support CRTC color management properties in DM in most single
* plane cases correctly with clever management of the DC interface in DM.
*
* As per DRM documentation, blocks should be in hardware bypass when their
* respective property is set to NULL. A linear DGM/RGM LUT should also
* considered as putting the respective block into bypass mode.
*
* This means that the following
* configuration is assumed to be the default:
*
* Plane DGM Bypass -> Plane CTM Bypass -> Plane RGM Bypass -> ...
* CRTC DGM Bypass -> CRTC CTM Bypass -> CRTC RGM Bypass
*/
#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();
}
/* Extracts the DRM lut and lut size from a blob. */
static const struct drm_color_lut *
__extract_blob_lut(const struct drm_property_blob *blob, uint32_t *size)
{
*size = blob ? drm_color_lut_size(blob) : 0;
return blob ? (struct drm_color_lut *)blob->data : NULL;
}
/*
* 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(const 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(const 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] = dc_fixpt_from_int(r);
gamma->entries.green[i] = dc_fixpt_from_int(g);
gamma->entries.blue[i] = dc_fixpt_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] = dc_fixpt_from_fraction(r, MAX_DRM_LUT_VALUE);
gamma->entries.green[i] = dc_fixpt_from_fraction(g, MAX_DRM_LUT_VALUE);
gamma->entries.blue[i] = dc_fixpt_from_fraction(b, MAX_DRM_LUT_VALUE);
}
}
/*
* Converts a DRM CTM to a DC CSC float matrix.
* The matrix needs to be a 3x4 (12 entry) matrix.
*/
static void __drm_ctm_to_dc_matrix(const struct drm_color_ctm *ctm,
struct fixed31_32 *matrix)
{
int64_t val;
int i;
/*
* 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) {
matrix[i] = dc_fixpt_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));
matrix[i].value = val;
}
}
/* Calculates the legacy transfer function - only for sRGB input space. */
static int __set_legacy_tf(struct dc_transfer_func *func,
const struct drm_color_lut *lut, uint32_t lut_size,
bool has_rom)
{
struct dc_gamma *gamma = NULL;
struct calculate_buffer cal_buffer = {0};
bool res;
ASSERT(lut && lut_size == MAX_COLOR_LEGACY_LUT_ENTRIES);
cal_buffer.buffer_index = -1;
gamma = dc_create_gamma();
if (!gamma)
return -ENOMEM;
gamma->type = GAMMA_RGB_256;
gamma->num_entries = lut_size;
__drm_lut_to_dc_gamma(lut, gamma, true);
res = mod_color_calculate_regamma_params(func, gamma, true, has_rom,
NULL, &cal_buffer);
dc_gamma_release(&gamma);
return res ? 0 : -ENOMEM;
}
/* Calculates the output transfer function based on expected input space. */
static int __set_output_tf(struct dc_transfer_func *func,
const struct drm_color_lut *lut, uint32_t lut_size,
bool has_rom)
{
struct dc_gamma *gamma = NULL;
struct calculate_buffer cal_buffer = {0};
bool res;
ASSERT(lut && lut_size == MAX_COLOR_LUT_ENTRIES);
cal_buffer.buffer_index = -1;
gamma = dc_create_gamma();
if (!gamma)
return -ENOMEM;
gamma->num_entries = lut_size;
__drm_lut_to_dc_gamma(lut, gamma, false);
if (func->tf == TRANSFER_FUNCTION_LINEAR) {
/*
* Color module doesn't like calculating regamma params
* on top of a linear input. But degamma params can be used
* instead to simulate this.
*/
gamma->type = GAMMA_CUSTOM;
res = mod_color_calculate_degamma_params(NULL, func,
gamma, true);
} else {
/*
* Assume sRGB. The actual mapping will depend on whether the
* input was legacy or not.
*/
gamma->type = GAMMA_CS_TFM_1D;
res = mod_color_calculate_regamma_params(func, gamma, false,
has_rom, NULL, &cal_buffer);
}
dc_gamma_release(&gamma);
return res ? 0 : -ENOMEM;
}
/* Caculates the input transfer function based on expected input space. */
static int __set_input_tf(struct dc_transfer_func *func,
const struct drm_color_lut *lut, uint32_t lut_size)
{
struct dc_gamma *gamma = NULL;
bool res;
gamma = dc_create_gamma();
if (!gamma)
return -ENOMEM;
gamma->type = GAMMA_CUSTOM;
gamma->num_entries = lut_size;
__drm_lut_to_dc_gamma(lut, gamma, false);
res = mod_color_calculate_degamma_params(NULL, func, gamma, true);
dc_gamma_release(&gamma);
return res ? 0 : -ENOMEM;
}
/**
* amdgpu_dm_update_crtc_color_mgmt: Maps DRM color management to DC stream.
* @crtc: amdgpu_dm crtc state
*
* With no plane level color management properties we're free to use any
* of the HW blocks as long as the CRTC CTM always comes before the
* CRTC RGM and after the CRTC DGM.
*
* The CRTC RGM block will be placed in the RGM LUT block if it is non-linear.
* The CRTC DGM block will be placed in the DGM LUT block if it is non-linear.
* The CRTC CTM will be placed in the gamut remap block if it is non-linear.
*
* The RGM block is typically more fully featured and accurate across
* all ASICs - DCE can't support a custom non-linear CRTC DGM.
*
* For supporting both plane level color management and CRTC level color
* management at once we have to either restrict the usage of CRTC properties
* or blend adjustments together.
*
* Returns 0 on success.
*/
int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc)
{
struct dc_stream_state *stream = crtc->stream;
struct amdgpu_device *adev =
(struct amdgpu_device *)crtc->base.state->dev->dev_private;
bool has_rom = adev->asic_type <= CHIP_RAVEN;
struct drm_color_ctm *ctm = NULL;
const struct drm_color_lut *degamma_lut, *regamma_lut;
uint32_t degamma_size, regamma_size;
bool has_regamma, has_degamma;
bool is_legacy;
int r;
degamma_lut = __extract_blob_lut(crtc->base.degamma_lut, °amma_size);
if (degamma_lut && degamma_size != MAX_COLOR_LUT_ENTRIES)
return -EINVAL;
regamma_lut = __extract_blob_lut(crtc->base.gamma_lut, ®amma_size);
if (regamma_lut && regamma_size != MAX_COLOR_LUT_ENTRIES &&
regamma_size != MAX_COLOR_LEGACY_LUT_ENTRIES)
return -EINVAL;
has_degamma =
degamma_lut && !__is_lut_linear(degamma_lut, degamma_size);
has_regamma =
regamma_lut && !__is_lut_linear(regamma_lut, regamma_size);
is_legacy = regamma_size == MAX_COLOR_LEGACY_LUT_ENTRIES;
/* Reset all adjustments. */
crtc->cm_has_degamma = false;
crtc->cm_is_degamma_srgb = false;
/* Setup regamma and degamma. */
if (is_legacy) {
/*
* Legacy regamma forces us to use the sRGB RGM as a base.
* This also means we can't use linear DGM since DGM needs
* to use sRGB as a base as well, resulting in incorrect CRTC
* DGM and CRTC CTM.
*
* TODO: Just map this to the standard regamma interface
* instead since this isn't really right. One of the cases
* where this setup currently fails is trying to do an
* inverse color ramp in legacy userspace.
*/
crtc->cm_is_degamma_srgb = true;
stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
stream->out_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
r = __set_legacy_tf(stream->out_transfer_func, regamma_lut,
regamma_size, has_rom);
if (r)
return r;
} else if (has_regamma) {
/* CRTC RGM goes into RGM LUT. */
stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
r = __set_output_tf(stream->out_transfer_func, regamma_lut,
regamma_size, has_rom);
if (r)
return r;
} else {
/*
* No CRTC RGM means we can just put the block into bypass
* since we don't have any plane level adjustments using it.
*/
stream->out_transfer_func->type = TF_TYPE_BYPASS;
stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
}
/*
* CRTC DGM goes into DGM LUT. It would be nice to place it
* into the RGM since it's a more featured block but we'd
* have to place the CTM in the OCSC in that case.
*/
crtc->cm_has_degamma = has_degamma;
/* Setup CRTC CTM. */
if (crtc->base.ctm) {
ctm = (struct drm_color_ctm *)crtc->base.ctm->data;
/*
* Gamut remapping must be used for gamma correction
* since it comes before the regamma correction.
*
* OCSC could be used for gamma correction, but we'd need to
* blend the adjustments together with the required output
* conversion matrix - so just use the gamut remap block
* for now.
*/
__drm_ctm_to_dc_matrix(ctm, stream->gamut_remap_matrix.matrix);
stream->gamut_remap_matrix.enable_remap = true;
stream->csc_color_matrix.enable_adjustment = false;
} else {
/* Bypass CTM. */
stream->gamut_remap_matrix.enable_remap = false;
stream->csc_color_matrix.enable_adjustment = false;
}
return 0;
}
/**
* amdgpu_dm_update_plane_color_mgmt: Maps DRM color management to DC plane.
* @crtc: amdgpu_dm crtc state
* @ dc_plane_state: target DC surface
*
* Update the underlying dc_stream_state's input transfer function (ITF) in
* preparation for hardware commit. The transfer function used depends on
* the prepartion done on the stream for color management.
*
* Returns 0 on success.
*/
int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
struct dc_plane_state *dc_plane_state)
{
const struct drm_color_lut *degamma_lut;
enum dc_transfer_func_predefined tf = TRANSFER_FUNCTION_SRGB;
uint32_t degamma_size;
int r;
/* Get the correct base transfer function for implicit degamma. */
switch (dc_plane_state->format) {
case SURFACE_PIXEL_FORMAT_VIDEO_420_YCbCr:
case SURFACE_PIXEL_FORMAT_VIDEO_420_YCrCb:
/* DC doesn't have a transfer function for BT601 specifically. */
tf = TRANSFER_FUNCTION_BT709;
break;
default:
break;
}
if (crtc->cm_has_degamma) {
degamma_lut = __extract_blob_lut(crtc->base.degamma_lut,
°amma_size);
ASSERT(degamma_size == MAX_COLOR_LUT_ENTRIES);
dc_plane_state->in_transfer_func->type =
TF_TYPE_DISTRIBUTED_POINTS;
/*
* This case isn't fully correct, but also fairly
* uncommon. This is userspace trying to use a
* legacy gamma LUT + atomic degamma LUT
* at the same time.
*
* Legacy gamma requires the input to be in linear
* space, so that means we need to apply an sRGB
* degamma. But color module also doesn't support
* a user ramp in this case so the degamma will
* be lost.
*
* Even if we did support it, it's still not right:
*
* Input -> CRTC DGM -> sRGB DGM -> CRTC CTM ->
* sRGB RGM -> CRTC RGM -> Output
*
* The CSC will be done in the wrong space since
* we're applying an sRGB DGM on top of the CRTC
* DGM.
*
* TODO: Don't use the legacy gamma interface and just
* map these to the atomic one instead.
*/
if (crtc->cm_is_degamma_srgb)
dc_plane_state->in_transfer_func->tf = tf;
else
dc_plane_state->in_transfer_func->tf =
TRANSFER_FUNCTION_LINEAR;
r = __set_input_tf(dc_plane_state->in_transfer_func,
degamma_lut, degamma_size);
if (r)
return r;
} else if (crtc->cm_is_degamma_srgb) {
/*
* For legacy gamma support we need the regamma input
* in linear space. Assume that the input is sRGB.
*/
dc_plane_state->in_transfer_func->type = TF_TYPE_PREDEFINED;
dc_plane_state->in_transfer_func->tf = tf;
if (tf != TRANSFER_FUNCTION_SRGB &&
!mod_color_calculate_degamma_params(NULL,
dc_plane_state->in_transfer_func, NULL, false))
return -ENOMEM;
} else {
/* ...Otherwise we can just bypass the DGM block. */
dc_plane_state->in_transfer_func->type = TF_TYPE_BYPASS;
dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
}
return 0;
}
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