mirror of
https://github.com/Ysurac/openmptcprouter.git
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93 lines
3.2 KiB
Diff
93 lines
3.2 KiB
Diff
From ff32bc207db21904e33316187a20da0685ff99b0 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] fbdev: Allow client to request a particular /dev/fbN 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 | 24 +++++++++++++++++-------
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include/linux/fb.h | 2 ++
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2 files changed, 19 insertions(+), 7 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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@@ -52,6 +52,7 @@ static 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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@@ -1579,19 +1580,22 @@ 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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fb_info->dev = device_create(fb_class, fb_info->device,
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- MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
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+ MKDEV(FB_MAJOR, fb_info->node), NULL, "fb%d", fb_info->node);
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if (IS_ERR(fb_info->dev)) {
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/* Not fatal */
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- printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
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+ printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n",
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+ fb_info->node, PTR_ERR(fb_info->dev));
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fb_info->dev = NULL;
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} else
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fb_init_device(fb_info);
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@@ -1624,7 +1628,7 @@ 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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@@ -1719,6 +1723,12 @@ static int fb_aperture_acquire_for_platf
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return ret;
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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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@@ -512,6 +512,7 @@ struct fb_info {
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} *apertures;
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bool skip_vt_switch; /* no VT switch on suspend/resume required */
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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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static inline struct apertures_struct *alloc_apertures(unsigned int max_num) {
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@@ -614,6 +615,7 @@ extern ssize_t fb_sys_write(struct fb_in
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size_t count, loff_t *ppos);
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/* drivers/video/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 fb_prepare_logo(struct fb_info *fb_info, int rotate);
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