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oxnas: backport patch fixing hang after reboot 

Sungbo Eo <mans0n@gorani.run> posted a patch fixing the long-standing
reboot problem on the OXNAS OX820 platform:
  irqchip/versatile-fpga: Handle chained IRQs properly

It got queued for 5.7. Import it to oxnas target patches for now.

Fixes: b4917fa907 ("oxnas: fix oxnas-rps-timer dt-match")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2020-03-19 22:37:17 +00:00
parent cb44ab4f5d
commit 67b04e767a
1 changed files with 77 additions and 0 deletions
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77
target/linux/oxnas/patches-5.4/001-irqchip-versatile-fpga-Handle-chained-IRQs-properly.patch Normal file
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@ -0,0 +1,77 @@
From patchwork Thu Mar 19 02:34:48 2020
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Patchwork-Submitter: Sungbo Eo <mans0n@gorani.run>
X-Patchwork-Id: 11446405
From: Sungbo Eo <mans0n@gorani.run>
To: Linus Walleij <linus.walleij@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>, Jason Cooper <jason@lakedaemon.net>,
Marc Zyngier <maz@kernel.org>, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-oxnas@groups.io
Subject: [PATCH v2] irqchip/versatile-fpga: Handle chained IRQs properly
Date: Thu, 19 Mar 2020 11:34:48 +0900
Message-Id: <20200319023448.1479701-1-mans0n@gorani.run>
In-Reply-To: <002b72cab9896fa5ac76a52e0cb503ff@kernel.org>
References: <002b72cab9896fa5ac76a52e0cb503ff@kernel.org>
MIME-Version: 1.0
List-Id: <linux-arm-kernel.lists.infradead.org>
Cc: Sungbo Eo <mans0n@gorani.run>, Neil Armstrong <narmstrong@baylibre.com>
Sender: "linux-arm-kernel" <linux-arm-kernel-bounces@lists.infradead.org>
Enclose the chained handler with chained_irq_{enter,exit}(), so that the
muxed interrupts get properly acked.
This patch also fixes a reboot bug on OX820 SoC, where the jiffies timer
interrupt is never acked. The kernel waits a clock tick forever in
calibrate_delay_converge(), which leads to a boot hang.
Fixes: c41b16f8c9d9 ("ARM: integrator/versatile: consolidate FPGA IRQ handling code")
Signed-off-by: Sungbo Eo <mans0n@gorani.run>
Cc: Neil Armstrong <narmstrong@baylibre.com>
---
v2: moved readl below chained_irq_enter()
added Fixes tag
drivers/irqchip/irq-versatile-fpga.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
--- a/drivers/irqchip/irq-versatile-fpga.c
+++ b/drivers/irqchip/irq-versatile-fpga.c
@@ -6,6 +6,7 @@
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
#include <linux/irqchip/versatile-fpga.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
@@ -68,12 +69,16 @@ static void fpga_irq_unmask(struct irq_d
static void fpga_irq_handle(struct irq_desc *desc)
{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
struct fpga_irq_data *f = irq_desc_get_handler_data(desc);
- u32 status = readl(f->base + IRQ_STATUS);
+ u32 status;
+ chained_irq_enter(chip, desc);
+
+ status = readl(f->base + IRQ_STATUS);
if (status == 0) {
do_bad_IRQ(desc);
- return;
+ goto out;
}
do {
@@ -82,6 +87,9 @@ static void fpga_irq_handle(struct irq_d
status &= ~(1 << irq);
generic_handle_irq(irq_find_mapping(f->domain, irq));
} while (status);
+
+out:
+ chained_irq_exit(chip, desc);
}
/*