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realtek: backport MIPS GIC patch

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Upstream has gained support for forced affinity settings in the MIPS
GIC interrupt controller. This is needed to enable the Otto timer on
the RTL931x platform. See

https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/
commit/?id=2250db8628a0d8293ad2e0671138b848a185fba1

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/19205
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Markus Stockhausen 2025-06-22 03:49:29 -04:00 committed by Robert Marko
parent dc95180540
commit f1257b1ca3
1 changed files with 47 additions and 0 deletions
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47
target/linux/realtek/patches-6.12/302-6.17-irqchip-mips-gic-forced-affinity.patch Normal file
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@ -0,0 +1,47 @@
From 2250db8628a0d8293ad2e0671138b848a185fba1 Mon Sep 17 00:00:00 2001
From: Markus Stockhausen <markus.stockhausen@gmx.de>
Date: Sat, 21 Jun 2025 01:49:51 -0400
Subject: irqchip/mips-gic: Allow forced affinity
Devices of the Realtek MIPS Otto platform use the official rtl-otto-timer
as clock event generator and CPU clocksource. It is registered for each CPU
startup via cpuhp_setup_state() and forces the affinity of the clockevent
interrupts to the appropriate CPU via irq_force_affinity().
On the "smaller" devices with a vendor specific interrupt controller
(supported by irq-realtek-rtl) the registration works fine. The "larger"
RTL931x series is based on a MIPS interAptiv dual core with a MIPS GIC
controller. Interrupt routing setup is cancelled because gic_set_affinity()
does not accept the current (not yet online) CPU as a target.
Relax the checks by evaluating the force parameter that is provided for
exactly this purpose like in other drivers. With this the affinity can be
set as follows:
- force = false: allow to set affinity to any online cpu
- force = true: allow to set affinity to any cpu
Co-developed-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Signed-off-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250621054952.380374-1-markus.stockhausen@gmx.de
---
drivers/irqchip/irq-mips-gic.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -263,7 +263,11 @@ static int gic_set_affinity(struct irq_d
unsigned long flags;
unsigned int cpu;
- cpu = cpumask_first_and(cpumask, cpu_online_mask);
+ if (force)
+ cpu = cpumask_first(cpumask);
+ else
+ cpu = cpumask_first_and(cpumask, cpu_online_mask);
+
if (cpu >= NR_CPUS)
return -EINVAL;