mirror of
https://github.com/Ysurac/openmptcprouter.git
synced 2025-03-09 15:40:20 +00:00
82 lines
2.7 KiB
Diff
82 lines
2.7 KiB
Diff
From 940f48d8897c4ca63cb9f0dfd5545d4fc3e60aea Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Mon, 9 Oct 2023 16:32:45 +0100
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Subject: [PATCH 394/697] fbdev: Allow client to request a particular /dev/fbN
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node
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Add a flag custom_fb_num to denote that the client has
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requested a specific fbdev node number via node.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/video/fbdev/core/fbmem.c | 19 ++++++++++++++-----
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include/linux/fb.h | 2 ++
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2 files changed, 16 insertions(+), 5 deletions(-)
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--- a/drivers/video/fbdev/core/fbmem.c
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+++ b/drivers/video/fbdev/core/fbmem.c
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@@ -31,6 +31,7 @@ struct class *fb_class;
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DEFINE_MUTEX(registration_lock);
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struct fb_info *registered_fb[FB_MAX] __read_mostly;
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int num_registered_fb __read_mostly;
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+int min_dynamic_fb __read_mostly;
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#define for_each_registered_fb(i) \
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for (i = 0; i < FB_MAX; i++) \
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if (!registered_fb[i]) {} else
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@@ -398,10 +399,12 @@ static int do_register_framebuffer(struc
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return -ENXIO;
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num_registered_fb++;
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- for (i = 0 ; i < FB_MAX; i++)
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- if (!registered_fb[i])
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- break;
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- fb_info->node = i;
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+ if (!fb_info->custom_fb_num || fb_info->node >= FB_MAX || registered_fb[fb_info->node]) {
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+ for (i = min_dynamic_fb ; i < FB_MAX; i++)
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+ if (!registered_fb[i])
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+ break;
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+ fb_info->node = i;
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+ }
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refcount_set(&fb_info->count, 1);
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mutex_init(&fb_info->lock);
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mutex_init(&fb_info->mm_lock);
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@@ -436,7 +439,7 @@ static int do_register_framebuffer(struc
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fb_var_to_videomode(&mode, &fb_info->var);
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fb_add_videomode(&mode, &fb_info->modelist);
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- registered_fb[i] = fb_info;
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+ registered_fb[fb_info->node] = fb_info;
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#ifdef CONFIG_GUMSTIX_AM200EPD
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{
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@@ -497,6 +500,12 @@ static void do_unregister_framebuffer(st
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put_fb_info(fb_info);
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}
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+void fb_set_lowest_dynamic_fb(int min_fb_dev)
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+{
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+ min_dynamic_fb = min_fb_dev;
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+}
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+EXPORT_SYMBOL(fb_set_lowest_dynamic_fb);
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+
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/**
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* register_framebuffer - registers a frame buffer device
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* @fb_info: frame buffer info structure
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--- a/include/linux/fb.h
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+++ b/include/linux/fb.h
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@@ -511,6 +511,7 @@ struct fb_info {
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bool skip_vt_switch; /* no VT switch on suspend/resume required */
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bool skip_panic; /* Do not write to the fb after a panic */
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+ bool custom_fb_num; /* Use value in node as the preferred node number */
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};
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/* This will go away
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@@ -600,6 +601,7 @@ extern ssize_t fb_sys_write(struct fb_in
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.fb_imageblit = sys_imageblit
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/* fbmem.c */
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+extern void fb_set_lowest_dynamic_fb(int min_fb_dev);
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extern int register_framebuffer(struct fb_info *fb_info);
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extern void unregister_framebuffer(struct fb_info *fb_info);
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extern int devm_register_framebuffer(struct device *dev, struct fb_info *fb_info);
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