[PATCH v3 06/16] ARM: configs: Everyone who had PANEL_SIMPLE now gets PANEL_SIMPLE_EDP

[Stephen Boyd]

Quoting Doug Anderson (2021-09-01 16:10:15)
> Hi,
> 
> On Wed, Sep 1, 2021 at 2:12 PM Olof Johansson <olof at lixom.net> wrote:
> >
> > On Wed, Sep 1, 2021 at 1:20 PM Douglas Anderson <dianders at chromium.org> wrote:
> > >
> > > In the patch ("drm/panel-simple-edp: Split eDP panels out of
> > > panel-simple") we split the PANEL_SIMPLE driver in 2. By default let's
> > > give everyone who had the old driver enabled the new driver too. If
> > > folks want to opt-out of one or the other they always can later.
> > >
> > > Signed-off-by: Douglas Anderson <dianders at chromium.org>
> >
> > Isn't this a case where the new option should just have had the old
> > option as the default value to avoid this kind of churn and possibly
> > broken platforms?
> 
> I'm happy to go either way. I guess I didn't do that originally
> because logically there's not any reason to link the two drivers going
> forward. Said another way, someone enabling the "simple panel" driver
> for non-eDP panels wouldn't expect that the "simple panel" driver for
> DP panels would also get enabled by default. They really have nothing
> to do with one another. Enabling by default for something like this
> also seems like it would lead to bloat. I could have sworn that
> periodically people get yelled at for marking drivers on by default
> when it doesn't make sense.
> 
> ...that being said, I'm happy to change the default as you suggest.
> Just let me know.

Having the default will help olddefconfig users seamlessly migrate to
the new Kconfig. Sadly they don't notice that they should probably
disable the previous Kconfig symbol, but oh well. At least with the
default they don't go on a hunt/bisect to figure out that some Kconfig
needed to be enabled now that they're using a new kernel version.

Maybe the default should have a TODO comment next to it indicating we
should remove the default in a year or two.