[3.16.y-ckt stable] Patch "ARM: shmobile: sh73a0 legacy: Set .control_parent for all irqpin instances" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    ARM: shmobile: sh73a0 legacy: Set .control_parent for all irqpin instances

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt5.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 95b2a6274438e45225324390375c92f54f415c7d Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert+renesas at glider.be>
Date: Tue, 6 Jan 2015 14:39:10 +0100
Subject: ARM: shmobile: sh73a0 legacy: Set .control_parent for all irqpin
 instances

commit b0ddb319db3d7a1943445f0de0a45c07a7f3457a upstream.

The sh73a0 INTC can't mask interrupts properly most likely due to a
hardware bug. Set the .control_parent flag to delegate masking to the
parent interrupt controller, like was already done for irqpin1.

Without this, accessing the three-axis digital accelerometer ADXL345
on kzm9g through /dev/input/event1 causes an interrupt storm, which
requires a power-cycle to recover from.

This was inspired by a patch for arch/arm/boot/dts/sh73a0.dtsi from
Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>.

Signed-off-by: Geert Uytterhoeven <geert+renesas at glider.be>
Fixes: 341eb5465f67437a ("ARM: shmobile: INTC External IRQ pin driver on sh73a0")
Signed-off-by: Simon Horman <horms+renesas at verge.net.au>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 arch/arm/mach-shmobile/setup-sh73a0.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-shmobile/setup-sh73a0.c b/arch/arm/mach-shmobile/setup-sh73a0.c
index ad00724a2269..f8584664369a 100644
--- a/arch/arm/mach-shmobile/setup-sh73a0.c
+++ b/arch/arm/mach-shmobile/setup-sh73a0.c
@@ -576,6 +576,7 @@ static struct platform_device ipmmu_device = {

 static struct renesas_intc_irqpin_config irqpin0_platform_data = {
 	.irq_base = irq_pin(0), /* IRQ0 -> IRQ7 */
+	.control_parent = true,
 };

 static struct resource irqpin0_resources[] = {
@@ -637,6 +638,7 @@ static struct platform_device irqpin1_device = {

 static struct renesas_intc_irqpin_config irqpin2_platform_data = {
 	.irq_base = irq_pin(16), /* IRQ16 -> IRQ23 */
+	.control_parent = true,
 };

 static struct resource irqpin2_resources[] = {
@@ -667,6 +669,7 @@ static struct platform_device irqpin2_device = {

 static struct renesas_intc_irqpin_config irqpin3_platform_data = {
 	.irq_base = irq_pin(24), /* IRQ24 -> IRQ31 */
+	.control_parent = true,
 };

 static struct resource irqpin3_resources[] = {
--
2.1.4