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drm/amd/display: Use 4096 lut entries

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Points in the DRM LUT are spaced linearly. Points in hardware are spaced
exponentially, with greater density towards 0. To maintain low-end
accuracy in hardware when sampling the DRM LUT, more points are needed.

However, X doesn't seem to play with legacy LUTs of such size.
Therefore, check for legacy lut when updating DC states, and update
accordingly.

v2: Use a macro for the maximum drm LUT value.

v3: Update commit to reflect that this does not map 1-1 to HW

Signed-off-by: Leo (Sunpeng) Li <sunpeng.li@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Leo (Sunpeng) Li 2018-02-12 13:20:56 -05:00 committed by Alex Deucher
parent 11fffe45b7
commit 086247a4b2
3 changed files with 61 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -3197,7 +3197,7 @@ static int amdgpu_dm_crtc_init(struct amdgpu_display_manager *dm,
dm->adev->mode_info.crtcs[crtc_index] = acrtc;
drm_crtc_enable_color_mgmt(&acrtc->base, MAX_COLOR_LUT_ENTRIES,
true, MAX_COLOR_LUT_ENTRIES);
drm_mode_crtc_set_gamma_size(&acrtc->base, MAX_COLOR_LUT_ENTRIES);
drm_mode_crtc_set_gamma_size(&acrtc->base, MAX_COLOR_LEGACY_LUT_ENTRIES);
return 0;

4
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
View File

@ -268,7 +268,9 @@ void amdgpu_dm_crtc_handle_crc_irq(struct drm_crtc *crtc);
#define amdgpu_dm_crtc_handle_crc_irq(x)
#endif
#define MAX_COLOR_LUT_ENTRIES 256
#define MAX_COLOR_LUT_ENTRIES 4096
/* Legacy gamm LUT users such as X doesn't like large LUT sizes */
#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,

77
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
View File

@ -27,6 +27,8 @@
#include "amdgpu_dm.h"
#include "modules/color/color_gamma.h"
#define MAX_DRM_LUT_VALUE 0xFFFF
/*
* Initialize the color module.
*
@ -47,19 +49,18 @@ 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)
static bool __is_lut_linear(struct drm_color_lut *lut, uint32_t size)
{
int i;
uint32_t max_os = 0xFF00;
uint32_t expected;
int delta;
for (i = 0; i < MAX_COLOR_LUT_ENTRIES; i++) {
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_os / (MAX_COLOR_LUT_ENTRIES-1);
expected = i * MAX_DRM_LUT_VALUE / (size-1);
/* Allow a +/-1 error. */
delta = lut[i].red - expected;
@ -69,6 +70,42 @@ static bool __is_lut_linear(struct drm_color_lut *lut)
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
@ -85,11 +122,10 @@ 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;
uint32_t r, g, b;
int i;
bool ret;
if (!blob) {
@ -100,8 +136,9 @@ int amdgpu_dm_set_regamma_lut(struct dm_crtc_state *crtc)
}
lut = (struct drm_color_lut *)blob->data;
lut_size = blob->length / sizeof(struct drm_color_lut);
if (__is_lut_linear(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;
@ -112,20 +149,20 @@ int amdgpu_dm_set_regamma_lut(struct dm_crtc_state *crtc)
if (!gamma)
return -ENOMEM;
gamma->num_entries = MAX_COLOR_LUT_ENTRIES;
gamma->type = GAMMA_RGB_256;
/* Truncate, and store in dc_gamma for output tf calculation */
for (i = 0; i < gamma->num_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);
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.
*/
@ -212,7 +249,7 @@ int amdgpu_dm_set_degamma_lut(struct drm_crtc_state *crtc_state,
}
lut = (struct drm_color_lut *)blob->data;
if (__is_lut_linear(lut)) {
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;