From: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
[Why]
To prepare for the upcoming DRM plane color management properties
we need to correct a lot of wrong behavior and assumptions made for
CRTC color management.
The documentation added by this commit in amdgpu_dm_color explains
how the HW color pipeline works and its limitations with the DRM
interface.
The current implementation does the following wrong:
- Implicit sRGB DGM when no CRTC DGM is set
- Implicit sRGB RGM when no CRTC RGM is set
- No way to specify a non-linear DGM matrix that produces correct output
- No way to specify a correct RGM when a linear DGM is used
We had workarounds for passing kms_color tests but not all of the
behavior we had wrong was covered by these tests (especially when
it comes to non-linear DGM). Testing both DGM and RGM at the same time
isn't something kms_color tests well either.
[How]
The specifics for how color management works in AMDGPU and the new
behavior can be found by reading the documentation added to
amdgpu_dm_color.c from this patch.
All of the incorrect cases from the old implementation have been
addressed for the atomic interface, but there still a few TODOs for
the legacy one.
Note: this does cause regressions for kms_color@pipe-a-ctm-* over HDMI.
The result looks correct from visual inspection but the CRC no longer
matches. For reference, the test was previously doing the following:
linear degamma -> CTM -> sRGB regamma -> RGB to YUV (709) -> ...
Now the test is doing:
linear degamma -> CTM -> linear regamma -> RGB to YUV (709) -> ...
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
Reviewed-by: Sun peng Li <Sunpeng.Li@xxxxxxx>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@xxxxxxx>
---
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 32 +-
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 10 +-
.../amd/display/amdgpu_dm/amdgpu_dm_color.c | 473 ++++++++++++------
3 files changed, 356 insertions(+), 159 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 36ee8fe52f38..d267a9cc840f 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2930,6 +2930,7 @@ static int fill_dc_plane_attributes(struct amdgpu_device *adev,
struct drm_plane_state *plane_state,
struct drm_crtc_state *crtc_state)
{
+ struct dm_crtc_state *dm_crtc_state = to_dm_crtc_state(crtc_state);
const struct amdgpu_framebuffer *amdgpu_fb =
to_amdgpu_framebuffer(plane_state->fb);
struct dc_scaling_info scaling_info;
@@ -2974,13 +2975,11 @@ static int fill_dc_plane_attributes(struct amdgpu_device *adev,
* Always set input transfer function, since plane state is refreshed
* every time.
*/
- ret = amdgpu_dm_set_degamma_lut(crtc_state, dc_plane_state);
- if (ret) {
- dc_transfer_func_release(dc_plane_state->in_transfer_func);
- dc_plane_state->in_transfer_func = NULL;
- }
+ ret = amdgpu_dm_update_plane_color_mgmt(dm_crtc_state, dc_plane_state);
+ if (ret)
+ return ret;
- return ret;
+ return 0;
}
static void update_stream_scaling_settings(const struct drm_display_mode *mode,
@@ -3552,6 +3551,8 @@ dm_crtc_duplicate_state(struct drm_crtc *crtc)
state->vrr_supported = cur->vrr_supported;
state->freesync_config = cur->freesync_config;
state->crc_enabled = cur->crc_enabled;
+ state->cm_has_degamma = cur->cm_has_degamma;
+ state->cm_is_degamma_srgb = cur->cm_is_degamma_srgb;
/* TODO Duplicate dc_stream after objects are stream object is flattened */
@@ -5595,8 +5596,18 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
bundle->stream_update.dst = acrtc_state->stream->dst;
}
- if (new_pcrtc_state->color_mgmt_changed)
- bundle->stream_update.out_transfer_func = acrtc_state->stream->out_transfer_func;
+ if (new_pcrtc_state->color_mgmt_changed) {
+ /*
+ * TODO: This isn't fully correct since we've actually
+ * already modified the stream in place.
+ */
+ bundle->stream_update.gamut_remap =
+ &acrtc_state->stream->gamut_remap_matrix;
+ bundle->stream_update.output_csc_transform =
+ &acrtc_state->stream->csc_color_matrix;
+ bundle->stream_update.out_transfer_func =
+ acrtc_state->stream->out_transfer_func;
+ }
acrtc_state->stream->abm_level = acrtc_state->abm_level;
if (acrtc_state->abm_level != dm_old_crtc_state->abm_level)
@@ -6426,10 +6437,9 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
*/
if (dm_new_crtc_state->base.color_mgmt_changed ||
drm_atomic_crtc_needs_modeset(new_crtc_state)) {
- ret = amdgpu_dm_set_regamma_lut(dm_new_crtc_state);
+ ret = amdgpu_dm_update_crtc_color_mgmt(dm_new_crtc_state);
if (ret)
goto fail;
- amdgpu_dm_set_ctm(dm_new_crtc_state);
}
/* Update Freesync settings. */
@@ -6732,6 +6742,8 @@ dm_determine_update_type_for_commit(struct amdgpu_display_manager *dm,
new_dm_plane_state->dc_state->in_transfer_func;
stream_update.gamut_remap =
&new_dm_crtc_state->stream->gamut_remap_matrix;
+ stream_update.output_csc_transform =
+ &new_dm_crtc_state->stream->csc_color_matrix;
stream_update.out_transfer_func =
new_dm_crtc_state->stream->out_transfer_func;
}
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
index 3395f2e4d564..5a0719418353 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
@@ -271,6 +271,9 @@ struct dm_crtc_state {
struct drm_crtc_state base;
struct dc_stream_state *stream;
+ bool cm_has_degamma;
+ bool cm_is_degamma_srgb;
+
int active_planes;
bool interrupts_enabled;
@@ -361,10 +364,9 @@ void amdgpu_dm_crtc_handle_crc_irq(struct drm_crtc *crtc);
#define MAX_COLOR_LEGACY_LUT_ENTRIES 256
void amdgpu_dm_init_color_mod(void);
-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);
+int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc);
+int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
+ struct dc_plane_state *dc_plane_state);
extern const struct drm_encoder_helper_funcs amdgpu_dm_encoder_helper_funcs;
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
index 7258c992a2bf..b43bb7f90e4e 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
@@ -27,6 +27,47 @@
#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
@@ -41,6 +82,13 @@ 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
@@ -50,7 +98,7 @@ void amdgpu_dm_init_color_mod(void)
* 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)
+static bool __is_lut_linear(const struct drm_color_lut *lut, uint32_t size)
{
int i;
uint32_t expected;
@@ -75,9 +123,8 @@ static bool __is_lut_linear(struct drm_color_lut *lut, uint32_t size)
* 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)
+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;
@@ -107,103 +154,16 @@ static void __drm_lut_to_dc_gamma(struct drm_color_lut *lut,
}
}
-/**
- * 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 amdgpu_device *adev = (struct amdgpu_device *)
- crtc->base.state->dev->dev_private;
- struct drm_color_lut *lut;
- uint32_t lut_size;
- struct dc_gamma *gamma = NULL;
- enum dc_transfer_func_type old_type = stream->out_transfer_func->type;
-
- bool ret;
-
- if (!blob && adev->asic_type <= CHIP_RAVEN) {
- /* 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;
- }
-
- if (blob) {
- lut = (struct drm_color_lut *)blob->data;
- lut_size = blob->length / sizeof(struct drm_color_lut);
-
- 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);
- }
-
- /* predefined gamma ROM only exist for RAVEN and pre-RAVEN ASIC,
- * set canRomBeUsed accordingly
- */
- stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
- ret = mod_color_calculate_regamma_params(stream->out_transfer_func,
- gamma, true, adev->asic_type <= CHIP_RAVEN, NULL);
-
- if (gamma)
- 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.
+/*
+ * Converts a DRM CTM to a DC CSC float matrix.
+ * The matrix needs to be a 3x4 (12 entry) matrix.
*/
-void amdgpu_dm_set_ctm(struct dm_crtc_state *crtc)
+static void __drm_ctm_to_dc_matrix(const struct drm_color_ctm *ctm,
+ struct fixed31_32 *matrix)
{
-
- 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.
@@ -215,83 +175,306 @@ void amdgpu_dm_set_ctm(struct dm_crtc_state *crtc)
for (i = 0; i < 12; i++) {
/* Skip 4th element */
if (i % 4 == 3) {
- stream->gamut_remap_matrix.matrix[i] = dc_fixpt_zero;
+ matrix[i] = dc_fixpt_zero;
continue;
}
/* gamut_remap_matrix[i] = ctm[i - floor(i/4)] */
- val = ctm->matrix[i - (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;
+ 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;
+ bool res;
-/**
- * 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.
- *
- * We support degamma bypass, predefined SRGB, and custom degamma
- *
- * RETURNS:
- * 0 on success
- * -EINVAL if crtc_state has a degamma_lut of invalid size
- * -ENOMEM if gamma allocation fails
- */
-int amdgpu_dm_set_degamma_lut(struct drm_crtc_state *crtc_state,
- struct dc_plane_state *dc_plane_state)
+ ASSERT(lut && lut_size == MAX_COLOR_LEGACY_LUT_ENTRIES);
+
+ 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);
+
+ 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 drm_property_blob *blob = crtc_state->degamma_lut;
- struct drm_color_lut *lut;
- uint32_t lut_size;
- struct dc_gamma *gamma;
- bool ret;
-
- 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;
- }
+ struct dc_gamma *gamma = NULL;
+ bool res;
- 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;
- }
+ ASSERT(lut && lut_size == MAX_COLOR_LUT_ENTRIES);
gamma = dc_create_gamma();
if (!gamma)
return -ENOMEM;
- lut_size = blob->length / sizeof(struct drm_color_lut);
gamma->num_entries = lut_size;
- if (gamma->num_entries == MAX_COLOR_LUT_ENTRIES)
+ __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;
- else {
- dc_gamma_release(&gamma);
- return -EINVAL;
+ res = mod_color_calculate_degamma_params(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);
}
+ 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);
- dc_plane_state->in_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
- ret = mod_color_calculate_degamma_params(dc_plane_state->in_transfer_func, gamma, true);
+ res = mod_color_calculate_degamma_params(func, gamma, true);
dc_gamma_release(&gamma);
- if (!ret) {
- dc_plane_state->in_transfer_func->type = TF_TYPE_BYPASS;
- DRM_ERROR("Out of memory when calculating degamma params\n");
- return -ENOMEM;
+
+ 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;
+ uint32_t degamma_size;
+ int r;
+
+ 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 =
+ TRANSFER_FUNCTION_SRGB;
+ 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 = TRANSFER_FUNCTION_SRGB;
+ } 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;
+}
--
2.17.1
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