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fbdev: fbmem: allow overriding the number of bootup logos

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Probably most useful if you want no logo at all, or if you only want one
logo regardless of how many CPU cores you have.

Signed-off-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190827110854.12574-3-peda@axentia.se
This commit is contained in:
Peter Rosin 2019-08-27 11:09:21 +00:00 committed by Bartlomiej Zolnierkiewicz
parent fd933c00eb
commit 691f50ab27
4 changed files with 22 additions and 3 deletions
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5
Documentation/fb/fbcon.rst
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@ -174,6 +174,11 @@ C. Boot options
displayed due to multiple CPUs, the collected line of logos is moved
as a whole.
9. fbcon=logo-count:<n>
The value 'n' overrides the number of bootup logos. 0 disables the
logo, and -1 gives the default which is the number of online CPUs.
C. Attaching, Detaching and Unloading
Before going on to how to attach, detach and unload the framebuffer console, an

7
drivers/video/fbdev/core/fbcon.c
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@ -536,6 +536,13 @@ static int __init fb_console_setup(char *this_opt)
fb_center_logo = true;
continue;
}
if (!strncmp(options, "logo-count:", 11)) {
options += 11;
if (*options)
fb_logo_count = simple_strtol(options, &options, 0);
continue;
}
}
return 1;
}

12
drivers/video/fbdev/core/fbmem.c
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@ -56,6 +56,8 @@ EXPORT_SYMBOL(num_registered_fb);
bool fb_center_logo __read_mostly;
EXPORT_SYMBOL(fb_center_logo);
int fb_logo_count __read_mostly = -1;
static struct fb_info *get_fb_info(unsigned int idx)
{
struct fb_info *fb_info;
@ -620,7 +622,7 @@ int fb_prepare_logo(struct fb_info *info, int rotate)
memset(&fb_logo, 0, sizeof(struct logo_data));
if (info->flags & FBINFO_MISC_TILEBLITTING ||
info->fbops->owner)
info->fbops->owner || !fb_logo_count)
return 0;
if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
@ -686,10 +688,14 @@ int fb_prepare_logo(struct fb_info *info, int rotate)
int fb_show_logo(struct fb_info *info, int rotate)
{
unsigned int count;
int y;
y = fb_show_logo_line(info, rotate, fb_logo.logo, 0,
num_online_cpus());
if (!fb_logo_count)
return 0;
count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count;
y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count);
y = fb_show_extra_logos(info, y, rotate);
return y;

1
include/linux/fb.h
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@ -625,6 +625,7 @@ 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 int fb_logo_count;
extern struct class *fb_class;
#define for_each_registered_fb(i) \