[PATCH] fbdev: fbmem: convert CONFIG_FB_LOGO_CENTER into a cmd line, option

[Peter Rosin <peda@axentia.se>]

On 2019-01-06 10:33, Geert Uytterhoeven wrote:
> Hi Peter,
> 
> On Mon, Nov 26, 2018 at 10:59 PM Peter Rosin <peda@axentia.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@axentia.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@axentia.se>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Peter Rosin <peda@axentia.se>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-fbdev@vger.kernel.org
Cc: linux-doc@vger.kernel.org
To: linux-kernel@vger.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@linux-m68k.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
---
 Documentation/fb/fbcon.txt       |  6 ++++++
 drivers/video/fbdev/core/fbcon.c |  5 +++++
 drivers/video/fbdev/core/fbmem.c | 19 ++++++++++---------
 drivers/video/logo/Kconfig       |  9 ---------
 include/linux/fb.h               |  1 +
 5 files changed, 22 insertions(+), 18 deletions(-)

diff --git a/Documentation/fb/fbcon.txt b/Documentation/fb/fbcon.txt
index 62af30511a95..fb5fa0a8d553 100644
--- 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.
+
 C. Attaching, Detaching and Unloading
 
 Before going on to how to attach, detach and unload the framebuffer console, an
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index 8976190b6c1f..552cfee63d76 100644
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -510,6 +510,11 @@ static int __init fb_console_setup(char *this_opt)
 			continue;
 		}
 #endif
+
+		if (!strcmp(options, "center-logo")) {
+			fb_center_logo = true;
+			continue;
+		}
 	}
 	return 1;
 }
diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 558ed2ed3124..cb43a2258c51 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -53,6 +53,9 @@ EXPORT_SYMBOL(registered_fb);
 int num_registered_fb __read_mostly;
 EXPORT_SYMBOL(num_registered_fb);
 
+bool fb_center_logo __read_mostly;
+EXPORT_SYMBOL(fb_center_logo);
+
 static struct fb_info *get_fb_info(unsigned int idx)
 {
 	struct fb_info *fb_info;
@@ -506,8 +509,7 @@ static int fb_show_logo_line(struct fb_info *info, int rotate,
 		fb_set_logo(info, logo, logo_new, fb_logo.depth);
 	}
 
-#ifdef CONFIG_FB_LOGO_CENTER
-	{
+	if (fb_center_logo) {
 		int xres = info->var.xres;
 		int yres = info->var.yres;
 
@@ -520,11 +522,11 @@ static int fb_show_logo_line(struct fb_info *info, int rotate,
 			--n;
 		image.dx = (xres - n * (logo->width + 8) - 8) / 2;
 		image.dy = y ?: (yres - logo->height) / 2;
+	} else {
+		image.dx = 0;
+		image.dy = y;
 	}
-#else
-	image.dx = 0;
-	image.dy = y;
-#endif
+
 	image.width = logo->width;
 	image.height = logo->height;
 
@@ -684,9 +686,8 @@ int fb_prepare_logo(struct fb_info *info, int rotate)
  	}
 
 	height = fb_logo.logo->height;
-#ifdef CONFIG_FB_LOGO_CENTER
-	height += (yres - fb_logo.logo->height) / 2;
-#endif
+	if (fb_center_logo)
+		height += (yres - fb_logo.logo->height) / 2;
 
 	return fb_prepare_extra_logos(info, height, yres);
 }
diff --git a/drivers/video/logo/Kconfig b/drivers/video/logo/Kconfig
index 1e972c4e88b1..d1f6196c8b9a 100644
--- a/drivers/video/logo/Kconfig
+++ b/drivers/video/logo/Kconfig
@@ -10,15 +10,6 @@ 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.
-
 config FB_LOGO_EXTRA
 	bool
 	depends on FB=y
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 7cdd31a69719..f52ef0ad6781 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -653,6 +653,7 @@ extern int fb_new_modelist(struct fb_info *info);
 
 extern struct fb_info *registered_fb[FB_MAX];
 extern int num_registered_fb;
+extern bool fb_center_logo;
 extern struct class *fb_class;
 
 #define for_each_registered_fb(i)		\
-- 
2.11.0