On Wed, Jan 04, 2023 at 12:05:16PM +0200, Jani Nikula wrote: > We try to avoid sending VICs defined in the later specs in AVI > infoframes to sinks that conform to the earlier specs, to not upset > them, and use 0 for the VIC instead. However, we do this detection and > conversion to 0 too early, as we'll need the actual VIC to figure out > the aspect ratio. > > In particular, for a mode with 64:27 aspect ratio, 0 for VIC fails the > AVI infoframe generation altogether with -EINVAL. > > Separate the VIC lookup from the "filtering", and postpone the > filtering, to use the proper VIC for aspect ratio handling, and the 0 > VIC for the infoframe video code as needed. > > Reported-by: William Tseng <william.tseng@xxxxxxxxx> > Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6153 > References: https://lore.kernel.org/r/20220920062316.43162-1-william.tseng@xxxxxxxxx > Cc: <stable@xxxxxxxxxxxxxxx> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > --- > drivers/gpu/drm/drm_edid.c | 21 ++++++++++++--------- > 1 file changed, 12 insertions(+), 9 deletions(-) > > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c > index 3841aba17abd..23f7146e6a9b 100644 > --- a/drivers/gpu/drm/drm_edid.c > +++ b/drivers/gpu/drm/drm_edid.c > @@ -6885,8 +6885,6 @@ static u8 drm_mode_hdmi_vic(const struct drm_connector *connector, > static u8 drm_mode_cea_vic(const struct drm_connector *connector, > const struct drm_display_mode *mode) > { > - u8 vic; > - > /* > * HDMI spec says if a mode is found in HDMI 1.4b 4K modes > * we should send its VIC in vendor infoframes, else send the > @@ -6896,13 +6894,18 @@ static u8 drm_mode_cea_vic(const struct drm_connector *connector, > if (drm_mode_hdmi_vic(connector, mode)) > return 0; > > - vic = drm_match_cea_mode(mode); > + return drm_match_cea_mode(mode); > +} > > - /* > - * HDMI 1.4 VIC range: 1 <= VIC <= 64 (CEA-861-D) but > - * HDMI 2.0 VIC range: 1 <= VIC <= 107 (CEA-861-F). So we > - * have to make sure we dont break HDMI 1.4 sinks. > - */ > +/* > + * Avoid sending VICs defined in HDMI 2.0 in AVI infoframes to sinks that > + * conform to HDMI 1.4. > + * > + * HDMI 1.4 (CTA-861-D) VIC range: [1..64] > + * HDMI 2.0 (CTA-861-F) VIC range: [1..107] > + */ > +static u8 vic_for_avi_infoframe(const struct drm_connector *connector, u8 vic) > +{ > if (!is_hdmi2_sink(connector) && vic > 64) > return 0; > > @@ -6978,7 +6981,7 @@ drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame, > picture_aspect = HDMI_PICTURE_ASPECT_NONE; > } > > - frame->video_code = vic; > + frame->video_code = vic_for_avi_infoframe(connector, vic); > frame->picture_aspect = picture_aspect; > frame->active_aspect = HDMI_ACTIVE_ASPECT_PICTURE; > frame->scan_mode = HDMI_SCAN_MODE_UNDERSCAN; > -- > 2.34.1 -- Ville Syrjälä Intel
