[PATCH v2 6/6] ARM: sun8i: dts: Add Ippo-q8h v1.2 with A33 and 1024x600 lcd support

Maxime Ripard maxime.ripard at free-electrons.com
Thu Jun 18 11:37:36 PDT 2015

On Wed, Jun 17, 2015 at 09:16:02AM +0200, Hans de Goede wrote:
> Hi,
> On 16-06-15 19:41, Maxime Ripard wrote:
> >Hi,
> >
> >On Sat, Jun 13, 2015 at 04:18:59PM +0200, Hans de Goede wrote:
> >>>Pantelis, to sum things up, we have a case of a tablet that comes with
> >>>the exact same board, but coming in two flavours with two differents
> >>>screen resolutions. It looks like a great case for your DT quirks
> >>>work, but we have no way of runtime detecting the difference between
> >>>the two variants. What do you think about this? Should we go with
> >>>using the DT quirks or is this simply out of scope?
> >>>
> >>>There's not so much example of similar cases in the kernel, and none
> >>>of them use quirks so far (obviously) but they all boil down to either
> >>>the solution you were suggesting in that patch or adding the alternate
> >>>configuration as a comment.
> >>>
> >>>I don't think the latter would work for you, and I agree with that, so
> >>>I guess that depending on what Pantelis says, either we go with a
> >>>better solution using the quirks, or we end up using what you
> >>>suggested (with a nitpick though, I'd prefer if you used the display
> >>>standard instead of the resolution, which would make it xga I guess?)
> >>
> >>If we go with a separate dts file for each of the 800x480 and 1024x600
> >>screens, I would greatly prefer to stick with the lcd1024x600 in the dts
> >>filename instead of using something like xga, the fact that you say:
> >>"I guess" that my answer to that is: I dunno I would need to look this
> >>up in wikipedia or some such makes me think that using a qualifier like
> >>xga is not going the help end users decide which dts file to pick, it
> >>will just lead to them needing to go to wikipedia too. Also note that
> >>the advertising of these tablets on ebay / aliexpress almost always
> >>uses the resolution and not something like "xga".
<> >>
> >>So all in all if we do not decide to use quirks for this I would like
> >>to keep the filename as is.
> >
> >Yeah, except that the display standard is also encoding the refresh
> >rate and color depth
> Huh? No it does not, see e.g.:
> https://en.wikipedia.org/wiki/Graphics_display_resolution
> Note nothing about depth and refresh-rate there, and I've really never
> heard anyone use things like xga to refer to colordepth and/or refreshrate

I was somehow convinced it did, and


seems to say that as well... Maybe not then, my bad.


Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
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