diff options
Diffstat (limited to 'target/linux/oxnas/patches-4.14/001-irqchip-versatile-fpga-Handle-chained-IRQs-properly.patch')
| -rw-r--r-- | target/linux/oxnas/patches-4.14/001-irqchip-versatile-fpga-Handle-chained-IRQs-properly.patch | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/target/linux/oxnas/patches-4.14/001-irqchip-versatile-fpga-Handle-chained-IRQs-properly.patch b/target/linux/oxnas/patches-4.14/001-irqchip-versatile-fpga-Handle-chained-IRQs-properly.patch new file mode 100644 index 0000000000..f4285aadd0 --- /dev/null +++ b/target/linux/oxnas/patches-4.14/001-irqchip-versatile-fpga-Handle-chained-IRQs-properly.patch @@ -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); + } + + /* |