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drm: Parse HDR metadata info from EDID

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HDR metadata block is introduced in CEA-861.3 spec.
Parsing the same to get the panel's HDR metadata.

v2: Rebase and added Ville's POC changes to the patch.

v3: No Change

v4: Addressed Shashank's review comments

v5: Addressed Shashank's comment and added his RB.

v6: Addressed Jonas Karlman review comments.

v7: Adressed Ville's review comments and fixed the issue
with length handling.

v8: Put the length check as per the convention followed in
existing code, as suggested by Ville.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1558015817-12025-4-git-send-email-uma.shankar@intel.com
This commit is contained in:
Uma Shankar 2019-05-16 19:40:08 +05:30 committed by Ville Syrjälä
parent c0b0ebb171
commit e85959d6cb
1 changed files with 51 additions and 0 deletions
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51
drivers/gpu/drm/drm_edid.c
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@ -2852,6 +2852,7 @@ add_detailed_modes(struct drm_connector *connector, struct edid *edid,
#define VIDEO_BLOCK 0x02
#define VENDOR_BLOCK 0x03
#define SPEAKER_BLOCK 0x04
#define HDR_STATIC_METADATA_BLOCK 0x6
#define USE_EXTENDED_TAG 0x07
#define EXT_VIDEO_CAPABILITY_BLOCK 0x00
#define EXT_VIDEO_DATA_BLOCK_420 0x0E
@ -3834,6 +3835,54 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode)
mode->clock = clock;
}
static bool cea_db_is_hdmi_hdr_metadata_block(const u8 *db)
{
if (cea_db_tag(db) != USE_EXTENDED_TAG)
return false;
if (db[1] != HDR_STATIC_METADATA_BLOCK)
return false;
if (cea_db_payload_len(db) < 3)
return false;
return true;
}
static uint8_t eotf_supported(const u8 *edid_ext)
{
return edid_ext[2] &
(BIT(HDMI_EOTF_TRADITIONAL_GAMMA_SDR) |
BIT(HDMI_EOTF_TRADITIONAL_GAMMA_HDR) |
BIT(HDMI_EOTF_SMPTE_ST2084));
}
static uint8_t hdr_metadata_type(const u8 *edid_ext)
{
return edid_ext[3] &
BIT(HDMI_STATIC_METADATA_TYPE1);
}
static void
drm_parse_hdr_metadata_block(struct drm_connector *connector, const u8 *db)
{
u16 len;
len = cea_db_payload_len(db);
connector->hdr_sink_metadata.hdmi_type1.eotf =
eotf_supported(db);
connector->hdr_sink_metadata.hdmi_type1.metadata_type =
hdr_metadata_type(db);
if (len >= 4)
connector->hdr_sink_metadata.hdmi_type1.max_cll = db[4];
if (len >= 5)
connector->hdr_sink_metadata.hdmi_type1.max_fall = db[5];
if (len >= 6)
connector->hdr_sink_metadata.hdmi_type1.min_cll = db[6];
}
static void
drm_parse_hdmi_vsdb_audio(struct drm_connector *connector, const u8 *db)
{
@ -4461,6 +4510,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
drm_parse_y420cmdb_bitmap(connector, db);
if (cea_db_is_vcdb(db))
drm_parse_vcdb(connector, db);
if (cea_db_is_hdmi_hdr_metadata_block(db))
drm_parse_hdr_metadata_block(connector, db);
}
}