linux-kernel - Re: [PATCH] fbdev: fbmem: convert CONFIG_FB_LOGO

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Date:   Mon, 7 Jan 2019 08:59:53 +0000
From:   Peter Rosin <peda@...ntia.se>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Linux Documentation List <linux-doc@...r.kernel.org>
Subject: Re: [PATCH] fbdev: fbmem: convert CONFIG_FB_LOGO_CENTER into a cmd
 line, option

On 2019-01-07 09:40, Geert Uytterhoeven wrote:
> Hi Peter,
> 
> On Mon, Jan 7, 2019 at 9:26 AM Peter Rosin <peda@...ntia.se> wrote:
>> On 2019-01-06 10:33, Geert Uytterhoeven wrote:
>>> On Mon, Nov 26, 2018 at 10:59 PM Peter Rosin <peda@...ntia.se> wrote:
>>>> If there are extra logos (CONFIG_FB_LOGO_EXTRA) the heights of these
>>>> extra logos are not considered when centering the first logo vertically.
>>>>
>>>> Signed-off-by: Peter Rosin <peda@...ntia.se>
>>>
>>>> --- a/drivers/video/logo/Kconfig
>>>> +++ b/drivers/video/logo/Kconfig
>>>> @@ -10,6 +10,15 @@ menuconfig LOGO
>>>>
>>>>  if LOGO
>>>>
>>>> +config FB_LOGO_CENTER
>>>> +       bool "Center the logo"
>>>> +       depends on FB=y
>>>> +       help
>>>> +         When this option is selected, the bootup logo is centered both
>>>> +         horizontally and vertically. If more than one logo is displayed
>>>> +         due to multiple CPUs, the collected line of logos is centered
>>>> +         as a whole.
>>>> +
>>>
>>> Isn't a kernel command line option more suitable to configure the position
>>> of the logo?
>>
>> That didn't occur to me previously, but it does make sense now that you
>> mention it. This is on top of v5.0-rc1, and if applied before v5.0 we
>> can avoid possible regressions for folks who might start to rely on
>> CONFIG_FB_LOGO_CENTER if v5.0 is released w/o this.
>>
>> Cheers,
>> Peter
>>
>> From de7353ab519ba9b5c9ea3f62d607bb8e94b687cc Mon Sep 17 00:00:00 2001
>> From: Peter Rosin <peda@...ntia.se>
>> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
>> Cc: Jonathan Corbet <corbet@....net>
>> Cc: Peter Rosin <peda@...ntia.se>
>> Cc: dri-devel@...ts.freedesktop.org
>> Cc: linux-fbdev@...r.kernel.org
>> Cc: linux-doc@...r.kernel.org
>> To: linux-kernel@...r.kernel.org
>> Date: Mon, 7 Jan 2019 08:35:26 +0100
>> Subject: [PATCH] fbdev: fbmem: convert CONFIG_FB_LOGO_CENTER into a cmd line
>>  option
>>
>> A command line option is much more flexible than a config option and
>> the supporting code is small. Gets rid of #ifdefs in the code too...
>>
>> Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>> Signed-off-by: Peter Rosin <peda@...ntia.se>
> 
> Thanks for your patch!
> 
>> --- a/Documentation/fb/fbcon.txt
>> +++ b/Documentation/fb/fbcon.txt
>> @@ -163,6 +163,12 @@ C. Boot options
>>         be preserved until there actually is some text is output to the console.
>>         This option causes fbcon to bind immediately to the fbdev device.
>>
>> +7. fbcon=center-logo
>> +
>> +       When this option is selected, the bootup logo is centered both
>> +       horizontally and vertically. If more than one logo is displayed due to
>> +       multiple CPUs, the collected line of logos is centered as a whole.
>> +
> 
> What about making this more generic, than an option specific for centering?
> Else people want fbcon=left-logo or fbcon=right-logo soon?
> 
>     fbcon=logo-pos:<pos>
> 
> With <pos> being "center", "left", "top", "right", "bottom", and combinations
> like "top,center"? Or is that complicating stuff too much?

I'm not too keen on implementing all that when I have zero use for it. I can
however rename the trigger for the existing fb_center_logo bool to

	fbcon=logo-pos:center

and add a check for "top,left" to reset the bool to false. Then the other
variants can be added later by whomever and when needed.

Is that good enough?

Cheers,
Peter