bcm27xx: add linux 5.4 support

Tested on bcm2710 (Raspberry Pi 3B).

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

1 files changed, 36 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0092-ARM-Activate-FIQs-to-avoid-__irq_startup-warnings.patch b/target/linux/bcm27xx/patches-5.4/950-0092-ARM-Activate-FIQs-to-avoid-__irq_startup-warnings.patch
new file mode 100644
index 0000000000..89f1eeee5d
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0092-ARM-Activate-FIQs-to-avoid-__irq_startup-warnings.patch
@@ -0,0 +1,36 @@
+From a32b114d39a51c28eb22f742a6f66d71aa8915fa Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Mon, 11 Dec 2017 09:18:32 +0000
+Subject: [PATCH] ARM: Activate FIQs to avoid __irq_startup warnings
+
+There is a new test in __irq_startup that the IRQ is activated, which
+hasn't been the case for FIQs since they bypass some of the usual setup.
+
+Augment enable_fiq to include a call to irq_activate to avoid the
+warning.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ arch/arm/kernel/fiq.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/arch/arm/kernel/fiq.c
++++ b/arch/arm/kernel/fiq.c
+@@ -56,6 +56,8 @@
+ static unsigned long dfl_fiq_insn;
+ static struct pt_regs dfl_fiq_regs;
+ 
++extern int irq_activate(struct irq_desc *desc);
++
+ /* Default reacquire function
+  * - we always relinquish FIQ control
+  * - we always reacquire FIQ control
+@@ -140,6 +142,8 @@ static int fiq_start;
+ 
+ void enable_fiq(int fiq)
+ {
++	struct irq_desc *desc = irq_to_desc(fiq + fiq_start);
++	irq_activate(desc);
+ 	enable_irq(fiq + fiq_start);
+ }
+