From mboxrd@z Thu Jan 1 00:00:00 1970 From: hdegoede@redhat.com (Hans de Goede) Date: Sun, 29 Jun 2014 16:11:02 +0200 Subject: [PATCH v3 4/4] pinctrl: sunxi: Define enable / disable irq callbacks for level triggered irqs In-Reply-To: <1404051062-24079-1-git-send-email-hdegoede@redhat.com> References: <1404051062-24079-1-git-send-email-hdegoede@redhat.com> Message-ID: <1404051062-24079-5-git-send-email-hdegoede@redhat.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Some drivers use disable_irq / enable_irq and do the work clearing the source in another thread instead of using a threaded interrupt handler. The irqchip used not having irq_disable and irq_enable callbacks in this case, will lead to unnecessary spurious interrupts: On a disable_irq in a chip without a handller for this, the irq core will remember the disable, but not actually call into the irqchip. With a level triggered interrupt (where the source has not been cleared) this will lead to an immediate retrigger, at which point the irq-core will mask the irq. So having an irq_disable callback in the irqchip will save us the interrupt firing a 2nd time for nothing. Drivers using disable / enable_irq like this, will call enable_irq when they finally have cleared the interrupt source, without an enable_irq callback, this will turn into an unmask, at which point the irq will trigger immediately because when it was originally acked the level was still high, so the ack was a nop. Signed-off-by: Hans de Goede --- drivers/pinctrl/sunxi/pinctrl-sunxi.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c index c1f0530..c641566 100644 --- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c @@ -643,6 +643,12 @@ static void sunxi_pinctrl_irq_unmask(struct irq_data *d) spin_unlock_irqrestore(&pctl->lock, flags); } +static void sunxi_pinctrl_irq_ack_unmask(struct irq_data *d) +{ + sunxi_pinctrl_irq_ack(d); + sunxi_pinctrl_irq_unmask(d); +} + static struct irq_chip sunxi_pinctrl_edge_irq_chip = { .irq_ack = sunxi_pinctrl_irq_ack, .irq_mask = sunxi_pinctrl_irq_mask, @@ -656,6 +662,10 @@ static struct irq_chip sunxi_pinctrl_level_irq_chip = { .irq_eoi = sunxi_pinctrl_irq_ack, .irq_mask = sunxi_pinctrl_irq_mask, .irq_unmask = sunxi_pinctrl_irq_unmask, + /* Define irq_enable / disable to avoid spurious irqs for drivers + * using these to suppress irqs while they clear the irq source */ + .irq_enable = sunxi_pinctrl_irq_ack_unmask, + .irq_disable = sunxi_pinctrl_irq_mask, .irq_request_resources = sunxi_pinctrl_irq_request_resources, .irq_set_type = sunxi_pinctrl_irq_set_type, .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_EOI_THREADED | -- 2.0.0