diff options
Diffstat (limited to 'drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c')
-rw-r--r-- | drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c new file mode 100644 index 000000000..d8e449e6e --- /dev/null +++ b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * (C) COPYRIGHT 2019 ARM Limited. All rights reserved. + * Author: James.Qian.Wang <james.qian.wang@arm.com> + * + */ + +#include "komeda_color_mgmt.h" + +/* 10bit precision YUV2RGB matrix */ +static const s32 yuv2rgb_bt601_narrow[KOMEDA_N_YUV2RGB_COEFFS] = { + 1192, 0, 1634, + 1192, -401, -832, + 1192, 2066, 0, + 64, 512, 512 +}; + +static const s32 yuv2rgb_bt601_wide[KOMEDA_N_YUV2RGB_COEFFS] = { + 1024, 0, 1436, + 1024, -352, -731, + 1024, 1815, 0, + 0, 512, 512 +}; + +static const s32 yuv2rgb_bt709_narrow[KOMEDA_N_YUV2RGB_COEFFS] = { + 1192, 0, 1836, + 1192, -218, -546, + 1192, 2163, 0, + 64, 512, 512 +}; + +static const s32 yuv2rgb_bt709_wide[KOMEDA_N_YUV2RGB_COEFFS] = { + 1024, 0, 1613, + 1024, -192, -479, + 1024, 1900, 0, + 0, 512, 512 +}; + +static const s32 yuv2rgb_bt2020[KOMEDA_N_YUV2RGB_COEFFS] = { + 1024, 0, 1476, + 1024, -165, -572, + 1024, 1884, 0, + 0, 512, 512 +}; + +const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range) +{ + bool narrow = color_range == DRM_COLOR_YCBCR_LIMITED_RANGE; + const s32 *coeffs; + + switch (color_encoding) { + case DRM_COLOR_YCBCR_BT709: + coeffs = narrow ? yuv2rgb_bt709_narrow : yuv2rgb_bt709_wide; + break; + case DRM_COLOR_YCBCR_BT601: + coeffs = narrow ? yuv2rgb_bt601_narrow : yuv2rgb_bt601_wide; + break; + case DRM_COLOR_YCBCR_BT2020: + coeffs = yuv2rgb_bt2020; + break; + default: + coeffs = NULL; + break; + } + + return coeffs; +} + +struct gamma_curve_sector { + u32 boundary_start; + u32 num_of_segments; + u32 segment_width; +}; + +struct gamma_curve_segment { + u32 start; + u32 end; +}; + +static struct gamma_curve_sector sector_tbl[] = { + { 0, 4, 4 }, + { 16, 4, 4 }, + { 32, 4, 8 }, + { 64, 4, 16 }, + { 128, 4, 32 }, + { 256, 4, 64 }, + { 512, 16, 32 }, + { 1024, 24, 128 }, +}; + +static void +drm_lut_to_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs, + struct gamma_curve_sector *sector_tbl, u32 num_sectors) +{ + struct drm_color_lut *lut; + u32 i, j, in, num = 0; + + if (!lut_blob) + return; + + lut = lut_blob->data; + + for (i = 0; i < num_sectors; i++) { + for (j = 0; j < sector_tbl[i].num_of_segments; j++) { + in = sector_tbl[i].boundary_start + + j * sector_tbl[i].segment_width; + + coeffs[num++] = drm_color_lut_extract(lut[in].red, + KOMEDA_COLOR_PRECISION); + } + } + + coeffs[num] = BIT(KOMEDA_COLOR_PRECISION); +} + +void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs) +{ + drm_lut_to_coeffs(lut_blob, coeffs, sector_tbl, ARRAY_SIZE(sector_tbl)); +} + +void drm_ctm_to_coeffs(struct drm_property_blob *ctm_blob, u32 *coeffs) +{ + struct drm_color_ctm *ctm; + u32 i; + + if (!ctm_blob) + return; + + ctm = ctm_blob->data; + + for (i = 0; i < KOMEDA_N_CTM_COEFFS; i++) + coeffs[i] = drm_color_ctm_s31_32_to_qm_n(ctm->matrix[i], 3, 12); +} |