linux-kernel - Re: [PATCH] simplefb: add support for a8b8g8r8 pixel format

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Date:	Thu, 6 Jun 2013 18:32:40 +0200
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Olof Johansson <olof@...om.net>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Alex Courbot <acourbot@...dia.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	"gnurou@...il.org" <gnurou@...il.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH] simplefb: add support for a8b8g8r8 pixel format

On 09:33 Thu 06 Jun     , Olof Johansson wrote:
> On Thu, Jun 6, 2013 at 9:20 AM, Jean-Christophe PLAGNIOL-VILLARD
> <plagnioj@...osoft.com> wrote:
> > On 10:11 Thu 06 Jun     , Stephen Warren wrote:
> >> On 06/06/2013 02:12 AM, Alex Courbot wrote:
> >> > On 06/06/2013 04:59 PM, Jean-Christophe PLAGNIOL-VILLARD wrote:
> >> >>
> >> >> On Jun 6, 2013, at 9:20 AM, Alexandre Courbot <acourbot@...dia.com>
> >> >> wrote:
> >> >>
> >> >>> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> >>
> >> No commit description? It'd be useful to at least justify this by
> >> mentioning that some platform will actually use this...
> >>
> >> ...
> >> >>> static struct simplefb_format simplefb_formats[] = {
> >> >>>     { "r5g6b5", 16, {11, 5}, {5, 6}, {0, 5}, {0, 0} },
> >> >>> +    { "a8b8g8r8", 32, {0, 8}, {8, 8}, {16, 8}, {31, 8} },
> >> >>
> >> >> why don't you parse the string?
> >> >>
> >> >> so you will a real generic bindings
> >> >
> >> > Tried that already, got NACKed: https://lkml.org/lkml/2013/5/27/330
> >> >
> >> > The list of modes of this driver should not grow too big. Even in terms
> >> > of footprint I'd say the list should remain smaller than the parsing code.
> >> >
> >> > What we can discuss though is whether we want to keep this a8b8g8r8
> >> > syntax or switch to something more standard, say "rgba8888".
> >>
> >> I would prefer to keep the syntax of the new formats consistent, so that
> >> if we ever do add format-parsing code rather than table-based lookup,
> >> all the existing formats will continue to work unchanged, without any
> >> kind of fallback lookup table.
> >
> > I do prefer a format-parsing than any long lookup table that take time at boot
> > time
> 
> We're talking about adding a bunch of code instead of one line in a
> table. Sorry, I NACK your NACK. If we get more entries we'll add the
> parser, but not just for this.
as there is no NACK so far I do take as a NACK

Best Regards,
J.
> 
> If you want to make a framebuffer-subsystem generic and shared helper,
> go ahead. I'm sure simplefb will move over to it when it's available.
> 
> Until then:
> 
> Acked-by: Olof Johansson <olof@...om.net>
> 
> 
> 
> -Olof
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