[PATCH 1/2] drm_edid: Add a function to get EDID base block

[Doug Anderson]

Hi,

On Tue, Feb 27, 2024 at 1:09 AM Jani Nikula <jani.nikula at linux.intel.com> wrote:
>
> On Fri, 23 Feb 2024, Hsin-Yi Wang <hsinyi at chromium.org> wrote:
> > It's found that some panels have variants that they share the same panel id
> > although their EDID and names are different. Besides panel id, now we need
> > the hash of entire EDID base block to distinguish these panel variants.
> >
> > Add drm_edid_get_base_block to returns the EDID base block, so caller can
> > further use it to get panel id and/or the hash.
>
> Please reconsider the whole approach here.
>
> Please let's not add single-use special case functions to read an EDID
> base block.
>
> Please consider reading the whole EDID, using the regular EDID reading
> functions, and use that instead.
>
> Most likely you'll only have 1-2 blocks anyway. And you might consider
> caching the EDID in struct panel_edp if reading the entire EDID is too
> slow. (And if it is, this is probably sensible even if the EDID only
> consists of one block.)

That makes a lot of sense! Not quite sure why I didn't just read the
whole EDID in the first place when trying to get the panel ID.

-Doug