On Tue, Feb 14, 2023 at 10:35 PM Ville Syrjälä
[off-list ref] wrote:
[...]

quoted

quoted

We should perhaps just get rid of HDMI_VENDOR_INFOFRAME_SIZE
entirely.

My thought was to make it the correct size for
drm_hdmi_vendor_infoframe_from_display_mode(). Then developers using
this "common" vendor infoframe don't have to worry much.
If there's another vendor infoframe implementation (which I'm not
aware of, but it may exist - since as you point out: it's vendor
specific) then the driver code shouldn't use
drm_hdmi_vendor_infoframe_from_display_mode() but rather implement
something custom. At that point the person implementing that will also
need to know their specific infoframe maximum size.

Yes but that other infoframe will still have
type==HDMI_INFOFRAME_TYPE_VENDOR, and
HDMI_INFOFRAME_SIZE(VENDOR) would again
give the wrong answer.

So this means the way forward is to remove HDMI_VENDOR_INFOFRAME_SIZE?
That means it's up to the (HDMI) driver developers to use a big enough
buffer (by hard-coding the size). Last time I checked all drivers did.


Best regards,
Martin