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Subject: Re: [PATCH] simplefb: add support for a8b8g8r8 pixel format
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
In-Reply-To: <51B0446A.4090305@nvidia.com>
Date: Thu, 6 Jun 2013 10:24:17 +0200
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>,
        Tomi Valkeinen <tomi.valkeinen@ti.com>,
        Stephen Warren <swarren@wwwdotorg.org>,
        Olof Johansson <olof@lixom.net>, "gnurou@gmail.org" <gnurou@gmail.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-fbdev@vger.kernel.org" <linux-fbdev@vger.kernel.org>
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References: <1370503259-16618-1-git-send-email-acourbot@nvidia.com> <3356BC4D-EEF6-4FCA-9310-5B0727EBF288@jcrosoft.com> <51B0446A.4090305@nvidia.com>
To: Alex Courbot <acourbot@nvidia.com>
Sender: linux-kernel-owner@vger.kernel.org
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On Jun 6, 2013, at 10:12 AM, Alex Courbot <acourbot@nvidia.com> wrote:

> On 06/06/2013 04:59 PM, Jean-Christophe PLAGNIOL-VILLARD wrote:
>> 
>> On Jun 6, 2013, at 9:20 AM, Alexandre Courbot <acourbot@nvidia.com> wrote:
>> 
>>> Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
>>> ---
>>> Documentation/devicetree/bindings/video/simple-framebuffer.txt | 1 +
>>> drivers/video/simplefb.c                                       | 1 +
>>> 2 files changed, 2 insertions(+)
>>> 
>>> diff --git a/Documentation/devicetree/bindings/video/simple-framebuffer.txt b/Documentation/devicetree/bindings/video/simple-framebuffer.txt
>>> index 3ea4605..70c26f3 100644
>>> --- a/Documentation/devicetree/bindings/video/simple-framebuffer.txt
>>> +++ b/Documentation/devicetree/bindings/video/simple-framebuffer.txt
>>> @@ -12,6 +12,7 @@ Required properties:
>>> - stride: The number of bytes in each line of the framebuffer.
>>> - format: The format of the framebuffer surface. Valid values are:
>>>   - r5g6b5 (16-bit pixels, d[15:11]=r, d[10:5]=g, d[4:0]=b).
>>> +  - a8b8g8r8 (32-bit pixels, d[31:24]=a, d[23:16]=b, d[15:8]=g, d[7:0]=r).
>>> 
>>> Example:
>>> 
>>> diff --git a/drivers/video/simplefb.c b/drivers/video/simplefb.c
>>> index e2e9e3e..d7041aa 100644
>>> --- a/drivers/video/simplefb.c
>>> +++ b/drivers/video/simplefb.c
>>> @@ -84,6 +84,7 @@ struct simplefb_format {
>>> 
>>> 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'm going to be very honest I do not like the simplefb driver from the beginning
but I do found it useful. And as said in it's name it need to be *SIMPLE*

Then a huge list of compatible no way
otherwise we drop this from the simplefb and make it a generic helper

I do not want to see format parser in every drivers this need to handle at video framework level

If I see that we start to increase again and again the simplefb I will not accept
to merge the code as we must keep it simple

Best Regards,
J.

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