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authorKevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>2017-05-15 15:03:47 +0100
committerHauke Mehrtens <hauke@hauke-m.de>2017-05-21 21:48:16 +0200
commit088e28772c504ad622ba909b0f6d2986910e7a97 (patch)
tree9bb961a4819da65df64f0088780395fa5ccf2426 /target/linux/lantiq/patches-4.4/0050-MIPS-Lantiq-Fix-cascaded-IRQ-setup.patch
parent0a05fbd1356631a1f903adcd63ffb05550537667 (diff)
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kernel: update kernel 4.4 to version 4.4.69
Refresh patches. A number of patches have landed upstream & hence are no longer required locally: 062-[1-6]-MIPS-* series 042-0004-mtd-bcm47xxpart-fix-parsing-first-block Reintroduced lantiq/patches-4.4/0050-MIPS-Lantiq-Fix-cascaded-IRQ-setup as it was incorrectly included upstream thus dropped from LEDE. As it has now been reverted upstream it needs to be included again for LEDE. Run tested ar71xx Archer C7 v2 and lantiq. Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk> [update from 4.4.68 to 4.4.69] Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Diffstat (limited to 'target/linux/lantiq/patches-4.4/0050-MIPS-Lantiq-Fix-cascaded-IRQ-setup.patch')
-rw-r--r--target/linux/lantiq/patches-4.4/0050-MIPS-Lantiq-Fix-cascaded-IRQ-setup.patch87
1 files changed, 87 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-4.4/0050-MIPS-Lantiq-Fix-cascaded-IRQ-setup.patch b/target/linux/lantiq/patches-4.4/0050-MIPS-Lantiq-Fix-cascaded-IRQ-setup.patch
new file mode 100644
index 0000000000..c0d7afc541
--- /dev/null
+++ b/target/linux/lantiq/patches-4.4/0050-MIPS-Lantiq-Fix-cascaded-IRQ-setup.patch
@@ -0,0 +1,87 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Thu, 19 Jan 2017 12:14:44 +0100
+Subject: [PATCH] MIPS: Lantiq: Fix cascaded IRQ setup
+
+With the IRQ stack changes integrated, the XRX200 devices started
+emitting a constant stream of kernel messages like this:
+
+[ 565.415310] Spurious IRQ: CAUSE=0x1100c300
+
+This appears to be caused by IP0 firing for some reason without being
+handled. Fix this by setting up IP2-6 as a proper chained IRQ handler and
+calling do_IRQ for all MIPS CPU interrupts.
+
+Cc: john@phrozen.org
+Cc: stable@vger.kernel.org
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/arch/mips/lantiq/irq.c
++++ b/arch/mips/lantiq/irq.c
+@@ -271,6 +271,11 @@ static void ltq_hw5_irqdispatch(void)
+ DEFINE_HWx_IRQDISPATCH(5)
+ #endif
+
++static void ltq_hw_irq_handler(struct irq_desc *desc)
++{
++ ltq_hw_irqdispatch(irq_desc_get_irq(desc) - 2);
++}
++
+ #ifdef CONFIG_MIPS_MT_SMP
+ void __init arch_init_ipiirq(int irq, struct irqaction *action)
+ {
+@@ -315,23 +320,19 @@ static struct irqaction irq_call = {
+ asmlinkage void plat_irq_dispatch(void)
+ {
+ unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
+- unsigned int i;
++ int irq;
+
+- if ((MIPS_CPU_TIMER_IRQ == 7) && (pending & CAUSEF_IP7)) {
+- do_IRQ(MIPS_CPU_TIMER_IRQ);
+- goto out;
+- } else {
+- for (i = 0; i < MAX_IM; i++) {
+- if (pending & (CAUSEF_IP2 << i)) {
+- ltq_hw_irqdispatch(i);
+- goto out;
+- }
+- }
++ if (!pending) {
++ spurious_interrupt();
++ return;
+ }
+- pr_alert("Spurious IRQ: CAUSE=0x%08x\n", read_c0_status());
+
+-out:
+- return;
++ pending >>= CAUSEB_IP;
++ while (pending) {
++ irq = fls(pending) - 1;
++ do_IRQ(MIPS_CPU_IRQ_BASE + irq);
++ pending &= ~BIT(irq);
++ }
+ }
+
+ static int icu_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
+@@ -356,11 +357,6 @@ static const struct irq_domain_ops irq_d
+ .map = icu_map,
+ };
+
+-static struct irqaction cascade = {
+- .handler = no_action,
+- .name = "cascade",
+-};
+-
+ int __init icu_of_init(struct device_node *node, struct device_node *parent)
+ {
+ struct device_node *eiu_node;
+@@ -392,7 +388,7 @@ int __init icu_of_init(struct device_nod
+ mips_cpu_irq_init();
+
+ for (i = 0; i < MAX_IM; i++)
+- setup_irq(i + 2, &cascade);
++ irq_set_chained_handler(i + 2, ltq_hw_irq_handler);
+
+ if (cpu_has_vint) {
+ pr_info("Setting up vectored interrupts\n");