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

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Date:	Thu, 6 Jun 2013 09:33:24 -0700
From:	Olof Johansson <olof@...om.net>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
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 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.

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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