[PATCH v2 16/34] drm/amd/display: add CRTC gamma TF support
From: Melissa Wen
Date: Thu Aug 10 2023 - 12:04:45 EST
From: Joshua Ashton <joshua@xxxxxxxxx>
Add predefined transfer function programming. There is no pre-blending
out gamma ROM, but we can use AMD color modules to program LUT
parameters from a pre-defined TF and an empty regamma LUT (or bump up
LUT parameters with pre-defined TF setup).
v2:
- update crtc color mgmt if regamma TF differs between states (Joshua)
- map inverse EOTF to DC transfer function (Melissa)
Signed-off-by: Joshua Ashton <joshua@xxxxxxxxx>
Co-developed-by: Melissa Wen <mwen@xxxxxxxxxx>
Signed-off-by: Melissa Wen <mwen@xxxxxxxxxx>
---
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 +
.../amd/display/amdgpu_dm/amdgpu_dm_color.c | 73 +++++++++++++++----
2 files changed, 58 insertions(+), 16 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 77b4d671a9e0..272974b88cda 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -9456,6 +9456,7 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
* when a modeset is needed, to ensure it gets reprogrammed.
*/
if (dm_new_crtc_state->base.color_mgmt_changed ||
+ dm_old_crtc_state->regamma_tf != dm_new_crtc_state->regamma_tf ||
drm_atomic_crtc_needs_modeset(new_crtc_state)) {
ret = amdgpu_dm_update_crtc_color_mgmt(dm_new_crtc_state);
if (ret)
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 c0bf55416b4d..0188e82d1fdd 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
@@ -468,16 +468,18 @@ static int __set_output_tf(struct dc_transfer_func *func,
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;
+ if (lut_size) {
+ ASSERT(lut && lut_size == MAX_COLOR_LUT_ENTRIES);
- gamma->num_entries = lut_size;
- __drm_lut_to_dc_gamma(lut, gamma, false);
+ 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) {
/*
@@ -485,32 +487,36 @@ static int __set_output_tf(struct dc_transfer_func *func,
* on top of a linear input. But degamma params can be used
* instead to simulate this.
*/
- gamma->type = GAMMA_CUSTOM;
+ if (gamma)
+ gamma->type = GAMMA_CUSTOM;
res = mod_color_calculate_degamma_params(NULL, func,
- gamma, true);
+ gamma, gamma != NULL);
} 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,
+ if (gamma)
+ gamma->type = GAMMA_CS_TFM_1D;
+ res = mod_color_calculate_regamma_params(func, gamma, gamma != NULL,
has_rom, NULL, &cal_buffer);
}
- dc_gamma_release(&gamma);
+ if (gamma)
+ dc_gamma_release(&gamma);
return res ? 0 : -ENOMEM;
}
static int amdgpu_dm_set_atomic_regamma(struct dc_stream_state *stream,
const struct drm_color_lut *regamma_lut,
- uint32_t regamma_size, bool has_rom)
+ uint32_t regamma_size, bool has_rom,
+ enum dc_transfer_func_predefined tf)
{
struct dc_transfer_func *out_tf = stream->out_transfer_func;
int ret = 0;
- if (regamma_size) {
+ if (regamma_size || tf != TRANSFER_FUNCTION_LINEAR) {
/* CRTC RGM goes into RGM LUT.
*
* Note: there is no implicit sRGB regamma here. We are using
@@ -518,7 +524,7 @@ static int amdgpu_dm_set_atomic_regamma(struct dc_stream_state *stream,
* from a linear base.
*/
out_tf->type = TF_TYPE_DISTRIBUTED_POINTS;
- out_tf->tf = TRANSFER_FUNCTION_LINEAR;
+ out_tf->tf = tf;
ret = __set_output_tf(out_tf, regamma_lut, regamma_size, has_rom);
} else {
@@ -564,6 +570,38 @@ static int __set_input_tf(struct dc_transfer_func *func,
return res ? 0 : -ENOMEM;
}
+static enum dc_transfer_func_predefined
+amdgpu_tf_to_dc_tf(enum amdgpu_transfer_function tf)
+{
+ switch (tf)
+ {
+ default:
+ case AMDGPU_TRANSFER_FUNCTION_DEFAULT:
+ case AMDGPU_TRANSFER_FUNCTION_LINEAR:
+ return TRANSFER_FUNCTION_LINEAR;
+ case AMDGPU_TRANSFER_FUNCTION_SRGB_EOTF:
+ case AMDGPU_TRANSFER_FUNCTION_SRGB_INV_EOTF:
+ return TRANSFER_FUNCTION_SRGB;
+ case AMDGPU_TRANSFER_FUNCTION_BT709_EOTF:
+ case AMDGPU_TRANSFER_FUNCTION_BT709_INV_EOTF:
+ return TRANSFER_FUNCTION_BT709;
+ case AMDGPU_TRANSFER_FUNCTION_PQ_EOTF:
+ case AMDGPU_TRANSFER_FUNCTION_PQ_INV_EOTF:
+ return TRANSFER_FUNCTION_PQ;
+ case AMDGPU_TRANSFER_FUNCTION_UNITY:
+ return TRANSFER_FUNCTION_UNITY;
+ case AMDGPU_TRANSFER_FUNCTION_GAMMA22_EOTF:
+ case AMDGPU_TRANSFER_FUNCTION_GAMMA22_INV_EOTF:
+ return TRANSFER_FUNCTION_GAMMA22;
+ case AMDGPU_TRANSFER_FUNCTION_GAMMA24_EOTF:
+ case AMDGPU_TRANSFER_FUNCTION_GAMMA24_INV_EOTF:
+ return TRANSFER_FUNCTION_GAMMA24;
+ case AMDGPU_TRANSFER_FUNCTION_GAMMA26_EOTF:
+ case AMDGPU_TRANSFER_FUNCTION_GAMMA26_INV_EOTF:
+ return TRANSFER_FUNCTION_GAMMA26;
+ }
+}
+
/**
* amdgpu_dm_verify_lut_sizes - verifies if DRM luts match the hw supported sizes
* @crtc_state: the DRM CRTC state
@@ -631,9 +669,12 @@ int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc)
const struct drm_color_lut *degamma_lut, *regamma_lut;
uint32_t degamma_size, regamma_size;
bool has_regamma, has_degamma;
+ enum dc_transfer_func_predefined tf = TRANSFER_FUNCTION_LINEAR;
bool is_legacy;
int r;
+ tf = amdgpu_tf_to_dc_tf(crtc->regamma_tf);
+
r = amdgpu_dm_verify_lut_sizes(&crtc->base);
if (r)
return r;
@@ -683,7 +724,7 @@ int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc)
} else {
regamma_size = has_regamma ? regamma_size : 0;
r = amdgpu_dm_set_atomic_regamma(stream, regamma_lut,
- regamma_size, has_rom);
+ regamma_size, has_rom, tf);
if (r)
return r;
}
--
2.40.1