71 lines
2.6 KiB
Diff
71 lines
2.6 KiB
Diff
From patchwork Wed Jun 21 18:20:04 2017
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Subject: pinctrl: bcm2835: Avoid warning from __irq_do_set_handler
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From: Stefan Wahren <stefan.wahren@i2se.com>
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X-Patchwork-Id: 9802555
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Message-Id: <1498069204-28154-1-git-send-email-stefan.wahren@i2se.com>
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To: Linus Walleij <linus.walleij@linaro.org>, Eric Anholt <eric@anholt.net>
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Cc: Stefan Wahren <stefan.wahren@i2se.com>, linux-gpio@vger.kernel.org,
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Phil Elwell <phil@raspberrypi.org>, linux-rpi-kernel@lists.infradead.org,
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linux-arm-kernel@lists.infradead.org
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Date: Wed, 21 Jun 2017 20:20:04 +0200
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We get a warning during boot with enabled EARLY_PRINTK that
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we try to set a irq_chip without data. This is caused by ignoring
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the return value of irq_of_parse_and_map(). So avoid calling
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gpiochip_set_chained_irqchip() in error case.
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Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
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Fixes: 85ae9e512f43 ("pinctrl: bcm2835: switch to GPIOLIB_IRQCHIP")
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---
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drivers/pinctrl/bcm/pinctrl-bcm2835.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
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index 1eb7a1a..2308831 100644
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--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
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+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
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@@ -1048,6 +1048,10 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
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for (i = 0; i < BCM2835_NUM_IRQS; i++) {
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pc->irq[i] = irq_of_parse_and_map(np, i);
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pc->irq_group[i] = i;
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+
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+ if (pc->irq[i] == 0)
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+ continue;
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+
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/*
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* Use the same handler for all groups: this is necessary
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* since we use one gpiochip to cover all lines - the
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From 8aa99fe688734f249b07314cdd7c5e25651c9c6d Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Thu, 27 Oct 2016 16:21:19 +0100
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Subject: irq-bcm2836: Prevent spurious interrupts, and trap them early
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The old arch-specific IRQ macros included a dsb to ensure the
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write to clear the mailbox interrupt completed before returning
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from the interrupt. The BCM2836 irqchip driver needs the same
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precaution to avoid spurious interrupts.
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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drivers/irqchip/irq-bcm2836.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/drivers/irqchip/irq-bcm2836.c b/drivers/irqchip/irq-bcm2836.c
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index e7463e3..a8db33b 100644
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--- a/drivers/irqchip/irq-bcm2836.c
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+++ b/drivers/irqchip/irq-bcm2836.c
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@@ -175,6 +175,7 @@ __exception_irq_entry bcm2836_arm_irqchip_handle_irq(struct pt_regs *regs)
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u32 ipi = ffs(mbox_val) - 1;
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writel(1 << ipi, mailbox0);
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+ dsb(sy);
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handle_IPI(ipi, regs);
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#endif
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} else if (stat) {
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--
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cgit v0.12
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