brcm2708: organize kernel patches

[openwrt/openwrt.git] / target / linux / brcm2708 / patches-4.19 / 950-0095-ARM64-Round-Robin-dispatch-IRQs-between-CPUs.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0095-ARM64-Round-Robin-dispatch-IRQs-between-CPUs.patch b/target/linux/brcm2708/patches-4.19/950-0095-ARM64-Round-Robin-dispatch-IRQs-between-CPUs.patch
new file mode 100644 (file)
index 0000000..235a72f
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0095-ARM64-Round-Robin-dispatch-IRQs-between-CPUs.patch
@@ -0,0 +1,72 @@
+From 3a9f3c695a95d3c34a360e9a95bccce37806c952 Mon Sep 17 00:00:00 2001
+From: Michael Zoran <mzoran@crowfest.net>
+Date: Sat, 14 Jan 2017 21:43:57 -0800
+Subject: [PATCH] ARM64: Round-Robin dispatch IRQs between CPUs.
+
+IRQ-CPU mapping is round robined on ARM64 to increase
+concurrency and allow multiple interrupts to be serviced
+at a time.  This reduces the need for FIQ.
+
+Signed-off-by: Michael Zoran <mzoran@crowfest.net>
+---
+ drivers/irqchip/irq-bcm2835.c | 15 ++++++++++++++-
+ drivers/irqchip/irq-bcm2836.c | 21 +++++++++++++++++++++
+ 2 files changed, 35 insertions(+), 1 deletion(-)
+
+--- a/drivers/irqchip/irq-bcm2835.c
++++ b/drivers/irqchip/irq-bcm2835.c
+@@ -162,10 +162,23 @@ static void armctrl_unmask_irq(struct ir
+       }
+ }
+ 
++#ifdef CONFIG_ARM64
++void bcm2836_arm_irqchip_spin_gpu_irq(void);
++
++static void armctrl_ack_irq(struct irq_data *d)
++{
++      bcm2836_arm_irqchip_spin_gpu_irq();
++}
++
++#endif
++
+ static struct irq_chip armctrl_chip = {
+       .name = "ARMCTRL-level",
+       .irq_mask = armctrl_mask_irq,
+-      .irq_unmask = armctrl_unmask_irq
++      .irq_unmask = armctrl_unmask_irq,
++#ifdef CONFIG_ARM64
++      .irq_ack    = armctrl_ack_irq
++#endif
+ };
+ 
+ static int armctrl_xlate(struct irq_domain *d, struct device_node *ctrlr,
+--- a/drivers/irqchip/irq-bcm2836.c
++++ b/drivers/irqchip/irq-bcm2836.c
+@@ -95,6 +95,27 @@ static void bcm2836_arm_irqchip_unmask_g
+ {
+ }
+ 
++#ifdef CONFIG_ARM64
++
++void bcm2836_arm_irqchip_spin_gpu_irq(void)
++{
++      u32 i;
++      void __iomem *gpurouting = (intc.base + LOCAL_GPU_ROUTING);
++      u32 routing_val = readl(gpurouting);
++
++      for (i = 1; i <= 3; i++) {
++              u32 new_routing_val = (routing_val + i) & 3;
++
++              if (cpu_active(new_routing_val)) {
++                      writel(new_routing_val, gpurouting);
++                      return;
++              }
++      }
++}
++EXPORT_SYMBOL(bcm2836_arm_irqchip_spin_gpu_irq);
++
++#endif
++
+ static struct irq_chip bcm2836_arm_irqchip_gpu = {
+       .name           = "bcm2836-gpu",
+       .irq_mask       = bcm2836_arm_irqchip_mask_gpu_irq,