bcm27xx: add support for linux v5.15

Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0881-Revert-fbdev-Hot-unplug-firmware-fb-devices-on-force.patch b/target/linux/bcm27xx/patches-5.15/950-0881-Revert-fbdev-Hot-unplug-firmware-fb-devices-on-force.patch
new file mode 100644
index 0000000000..b6ae1dc214
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0881-Revert-fbdev-Hot-unplug-firmware-fb-devices-on-force.patch
@@ -0,0 +1,86 @@
+From 4899d3181465e16d548af03b7825c4b06e0f0e44 Mon Sep 17 00:00:00 2001
+From: Dom Cobley <popcornmix@gmail.com>
+Date: Thu, 28 Apr 2022 16:11:34 +0100
+Subject: [PATCH] Revert "fbdev: Hot-unplug firmware fb devices on
+ forced removal"
+
+This reverts commit c894ac44786cfed383a6c6b20c1bfb12eb96018a.
+---
+ drivers/video/fbdev/core/fbmem.c | 29 +++--------------------------
+ include/linux/fb.h               |  1 -
+ 2 files changed, 3 insertions(+), 27 deletions(-)
+
+--- a/drivers/video/fbdev/core/fbmem.c
++++ b/drivers/video/fbdev/core/fbmem.c
+@@ -25,7 +25,6 @@
+ #include <linux/init.h>
+ #include <linux/linux_logo.h>
+ #include <linux/proc_fs.h>
+-#include <linux/platform_device.h>
+ #include <linux/seq_file.h>
+ #include <linux/console.h>
+ #include <linux/kmod.h>
+@@ -1596,36 +1595,18 @@ static void do_remove_conflicting_frameb
+ 	/* check all firmware fbs and kick off if the base addr overlaps */
+ 	for_each_registered_fb(i) {
+ 		struct apertures_struct *gen_aper;
+-		struct device *device;
+ 
+ 		if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
+ 			continue;
+ 
+ 		gen_aper = registered_fb[i]->apertures;
+-		device = registered_fb[i]->device;
+ 		if (fb_do_apertures_overlap(gen_aper, a) ||
+ 			(primary && gen_aper && gen_aper->count &&
+ 			 gen_aper->ranges[0].base == VGA_FB_PHYS)) {
+ 
+ 			printk(KERN_INFO "fb%d: switching to %s from %s\n",
+ 			       i, name, registered_fb[i]->fix.id);
+-
+-			/*
+-			 * If we kick-out a firmware driver, we also want to remove
+-			 * the underlying platform device, such as simple-framebuffer,
+-			 * VESA, EFI, etc. A native driver will then be able to
+-			 * allocate the memory range.
+-			 *
+-			 * If it's not a platform device, at least print a warning. A
+-			 * fix would add code to remove the device from the system.
+-			 */
+-			if (dev_is_platform(device)) {
+-				registered_fb[i]->forced_out = true;
+-				platform_device_unregister(to_platform_device(device));
+-			} else {
+-				pr_warn("fb%d: cannot remove device\n", i);
+-				do_unregister_framebuffer(registered_fb[i]);
+-			}
++			do_unregister_framebuffer(registered_fb[i]);
+ 		}
+ 	}
+ }
+@@ -1952,13 +1933,9 @@ EXPORT_SYMBOL(register_framebuffer);
+ void
+ unregister_framebuffer(struct fb_info *fb_info)
+ {
+-	bool forced_out = fb_info->forced_out;
+-
+-	if (!forced_out)
+-		mutex_lock(&registration_lock);
++	mutex_lock(&registration_lock);
+ 	do_unregister_framebuffer(fb_info);
+-	if (!forced_out)
+-		mutex_unlock(&registration_lock);
++	mutex_unlock(&registration_lock);
+ }
+ EXPORT_SYMBOL(unregister_framebuffer);
+ 
+--- a/include/linux/fb.h
++++ b/include/linux/fb.h
+@@ -502,7 +502,6 @@ struct fb_info {
+ 	} *apertures;
+ 
+ 	bool skip_vt_switch; /* no VT switch on suspend/resume required */
+-	bool forced_out; /* set when being removed by another driver */
+ };
+ 
+ static inline struct apertures_struct *alloc_apertures(unsigned int max_num) {