On Sun, 23 Jan 2022, Philipp Zabel <philipp.zabel@xxxxxxxxx> wrote: > Add minimal support for parsing VSDBs documented in Microsoft's "EDID > extension for head-mounted and specialized monitors" [1]. The version > field and the desktop usage flag can be used to set the non_desktop > connector property. > > [1] https://docs.microsoft.com/en-us/windows-hardware/drivers/display/specialized-monitors-edid-extension > > Tested with HPN-36C1 and LEN-B800. > > Signed-off-by: Philipp Zabel <philipp.zabel@xxxxxxxxx> > Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx> Thanks for the patches, both pushed to drm-misc-next. BR, Jani. > --- > Changes since v1 [2]: > - Split out quirk removal into a separate patch. > - Set non_desktop to true instead of 1. > > [2] https://lore.kernel.org/all/20211213184706.5776-1-philipp.zabel@xxxxxxxxx/ > --- > drivers/gpu/drm/drm_edid.c | 34 ++++++++++++++++++++++++++++++++++ > 1 file changed, 34 insertions(+) > > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c > index 12893e7be89b..271b5616cfaf 100644 > --- a/drivers/gpu/drm/drm_edid.c > +++ b/drivers/gpu/drm/drm_edid.c > @@ -93,6 +93,8 @@ static int oui(u8 first, u8 second, u8 third) > /* Non desktop display (i.e. HMD) */ > #define EDID_QUIRK_NON_DESKTOP (1 << 12) > > +#define MICROSOFT_IEEE_OUI 0xca125c > + > struct detailed_mode_closure { > struct drm_connector *connector; > struct edid *edid; > @@ -4222,6 +4224,17 @@ static bool cea_db_is_hdmi_forum_vsdb(const u8 *db) > return oui(db[3], db[2], db[1]) == HDMI_FORUM_IEEE_OUI; > } > > +static bool cea_db_is_microsoft_vsdb(const u8 *db) > +{ > + if (cea_db_tag(db) != VENDOR_BLOCK) > + return false; > + > + if (cea_db_payload_len(db) != 21) > + return false; > + > + return oui(db[3], db[2], db[1]) == MICROSOFT_IEEE_OUI; > +} > + > static bool cea_db_is_vcdb(const u8 *db) > { > if (cea_db_tag(db) != USE_EXTENDED_TAG) > @@ -5149,6 +5162,25 @@ drm_parse_hdmi_vsdb_video(struct drm_connector *connector, const u8 *db) > drm_parse_hdmi_deep_color_info(connector, db); > } > > +/* > + * See EDID extension for head-mounted and specialized monitors, specified at: > + * https://docs.microsoft.com/en-us/windows-hardware/drivers/display/specialized-monitors-edid-extension > + */ > +static void drm_parse_microsoft_vsdb(struct drm_connector *connector, > + const u8 *db) > +{ > + struct drm_display_info *info = &connector->display_info; > + u8 version = db[4]; > + bool desktop_usage = db[5] & BIT(6); > + > + /* Version 1 and 2 for HMDs, version 3 flags desktop usage explicitly */ > + if (version == 1 || version == 2 || (version == 3 && !desktop_usage)) > + info->non_desktop = true; > + > + drm_dbg_kms(connector->dev, "HMD or specialized display VSDB version %u: 0x%02x\n", > + version, db[5]); > +} > + > static void drm_parse_cea_ext(struct drm_connector *connector, > const struct edid *edid) > { > @@ -5179,6 +5211,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector, > drm_parse_hdmi_vsdb_video(connector, db); > if (cea_db_is_hdmi_forum_vsdb(db)) > drm_parse_hdmi_forum_vsdb(connector, db); > + if (cea_db_is_microsoft_vsdb(db)) > + drm_parse_microsoft_vsdb(connector, db); > if (cea_db_is_y420cmdb(db)) > drm_parse_y420cmdb_bitmap(connector, db); > if (cea_db_is_vcdb(db)) > > base-commit: e783362eb54cd99b2cac8b3a9aeac942e6f6ac07 -- Jani Nikula, Intel Open Source Graphics Center
