From: Uma Shankar uma.shankar@intel.com
CEA 861.3 spec adds colorimetry data block for HDMI. Parsing the block to get the colorimetry data from panel.
This was posted by Uma Shankar at https://patchwork.kernel.org/patch/10861327/
Modified by Abhinav Kumar: - Use macros to distinguish the bit fields for clarity
Signed-off-by: Uma Shankar uma.shankar@intel.com Signed-off-by: Abhinav Kumar abhinavk@codeaurora.org --- drivers/gpu/drm/drm_edid.c | 54 +++++++++++++++++++++++++++++++++++++++++++++ include/drm/drm_connector.h | 3 +++ include/drm/drm_edid.h | 11 +++++++++ 3 files changed, 68 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 99769d6..148bfa4 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -3136,6 +3136,7 @@ static int drm_cvt_modes(struct drm_connector *connector, #define VIDEO_BLOCK 0x02 #define VENDOR_BLOCK 0x03 #define SPEAKER_BLOCK 0x04 +#define COLORIMETRY_DATA_BLOCK 0x5 #define HDR_STATIC_METADATA_BLOCK 0x6 #define USE_EXTENDED_TAG 0x07 #define EXT_VIDEO_CAPABILITY_BLOCK 0x00 @@ -4199,6 +4200,57 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode) mode->clock = clock; }
+static bool cea_db_is_hdmi_colorimetry_data_block(const u8 *db) +{ + if (cea_db_tag(db) != USE_EXTENDED_TAG) + return false; + + if (db[1] != COLORIMETRY_DATA_BLOCK) + return false; + + if (cea_db_payload_len(db) < 2) + return false; + + return true; +} + +static void +drm_parse_colorimetry_data_block(struct drm_connector *connector, const u8 *db) +{ + struct drm_hdmi_info *info = &connector->display_info.hdmi; + + /* As per CEA 861-G spec */ + /* Byte 3 Bit 0: xvYCC_601 */ + if (db[2] & BIT(0)) + info->colorimetry |= DRM_EDID_CLRMETRY_xvYCC_601; + /* Byte 3 Bit 1: xvYCC_709 */ + if (db[2] & BIT(1)) + info->colorimetry |= DRM_EDID_CLRMETRY_xvYCC_709; + /* Byte 3 Bit 2: sYCC_601 */ + if (db[2] & BIT(2)) + info->colorimetry |= DRM_EDID_CLRMETRY_sYCC_601; + /* Byte 3 Bit 3: ADBYCC_601 */ + if (db[2] & BIT(3)) + info->colorimetry |= DRM_EDID_CLRMETRY_ADBYCC_601; + /* Byte 3 Bit 4: ADB_RGB */ + if (db[2] & BIT(4)) + info->colorimetry |= DRM_EDID_CLRMETRY_ADB_RGB; + /* Byte 3 Bit 5: BT2020_CYCC */ + if (db[2] & BIT(5)) + info->colorimetry |= DRM_EDID_CLRMETRY_BT2020_CYCC; + /* Byte 3 Bit 6: BT2020_YCC */ + if (db[2] & BIT(6)) + info->colorimetry |= DRM_EDID_CLRMETRY_BT2020_YCC; + /* Byte 3 Bit 7: BT2020_RGB */ + if (db[2] & BIT(7)) + info->colorimetry |= DRM_EDID_CLRMETRY_BT2020_RGB; + /* Byte 4 Bit 7: DCI-P3 */ + if (db[3] & BIT(7)) + info->colorimetry |= DRM_EDID_CLRMETRY_DCI_P3; + + DRM_DEBUG_KMS("Supported Colorimetry 0x%x\n", info->colorimetry); +} + static bool cea_db_is_hdmi_hdr_metadata_block(const u8 *db) { if (cea_db_tag(db) != USE_EXTENDED_TAG) @@ -4877,6 +4929,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector, drm_parse_vcdb(connector, db); if (cea_db_is_hdmi_hdr_metadata_block(db)) drm_parse_hdr_metadata_block(connector, db); + if (cea_db_is_hdmi_colorimetry_data_block(db)) + drm_parse_colorimetry_data_block(connector, db); } }
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index 2219109..a996ee3 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -207,6 +207,9 @@ struct drm_hdmi_info {
/** @y420_dc_modes: bitmap of deep color support index */ u8 y420_dc_modes; + + /* @colorimetry: bitmap of supported colorimetry modes */ + u16 colorimetry; };
/** diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index f0b03d4..6168c1c 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -224,6 +224,17 @@ struct detailed_timing { DRM_EDID_YCBCR420_DC_36 | \ DRM_EDID_YCBCR420_DC_30)
+/* Supported Colorimetry from colorimetry data block */ +#define DRM_EDID_CLRMETRY_xvYCC_601 (1 << 0) +#define DRM_EDID_CLRMETRY_xvYCC_709 (1 << 1) +#define DRM_EDID_CLRMETRY_sYCC_601 (1 << 2) +#define DRM_EDID_CLRMETRY_ADBYCC_601 (1 << 3) +#define DRM_EDID_CLRMETRY_ADB_RGB (1 << 4) +#define DRM_EDID_CLRMETRY_BT2020_CYCC (1 << 5) +#define DRM_EDID_CLRMETRY_BT2020_YCC (1 << 6) +#define DRM_EDID_CLRMETRY_BT2020_RGB (1 << 7) +#define DRM_EDID_CLRMETRY_DCI_P3 (1 << 15) + /* ELD Header Block */ #define DRM_ELD_HEADER_BLOCK_SIZE 4