From: Maulik Shah <mkshah@codeaurora.org>
To: Marc Zyngier <maz@kernel.org>
Cc: bjorn.andersson@linaro.org, linus.walleij@linaro.org,
swboyd@chromium.org, evgreen@chromium.org, mka@chromium.org,
linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-gpio@vger.kernel.org, agross@kernel.org,
tglx@linutronix.de, jason@lakedaemon.net, dianders@chromium.org,
rnayak@codeaurora.org, ilina@codeaurora.org,
lsrao@codeaurora.org
Subject: Re: [PATCH 1/4] gpio: gpiolib: Allow GPIO IRQs to lazy disable
Date: Sat, 23 May 2020 22:36:51 +0530 [thread overview]
Message-ID: <e08c9f6e-0e84-5f2a-766d-7a1c45bd977a@codeaurora.org> (raw)
In-Reply-To: <5888fc645d26b4780e9d9c6fd582374f@kernel.org>
Hi,
On 5/23/2020 3:12 PM, Marc Zyngier wrote:
> On 2020-05-22 14:19, Maulik Shah wrote:
>> With 'commit 461c1a7d4733 ("gpiolib: override irq_enable/disable")'
>> gpiolib
>> overrides irqchip's irq_enable and irq_disable callbacks. If irq_disable
>> callback is implemented then genirq takes unlazy path to disable irq.
>>
>> Underlying irqchip may not want to implement irq_disable callback to
>> lazy
>> disable irq when client drivers invokes disable_irq(). By overriding
>> irq_disable callback, gpiolib ends up always unlazy disabling IRQ.
>>
>> Allow gpiolib to lazy disable IRQs by overriding irq_disable callback
>> only
>> if irqchip implemented irq_disable. In cases where irq_disable is not
>> implemented irq_mask is overridden. Similarly override irq_enable
>> callback
>> only if irqchip implemented irq_enable otherwise irq_unmask is
>> overridden.
>>
>> Fixes: 461c1a7d47 (gpiolib: override irq_enable/disable)
>> Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
>> ---
>> drivers/gpio/gpiolib.c | 59
>> +++++++++++++++++++++++++++++----------------
>> include/linux/gpio/driver.h | 13 ++++++++++
>> 2 files changed, 51 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
>> index eaa0e20..a8fdc74 100644
>> --- a/drivers/gpio/gpiolib.c
>> +++ b/drivers/gpio/gpiolib.c
>> @@ -2465,33 +2465,38 @@ static void gpiochip_irq_relres(struct
>> irq_data *d)
>> gpiochip_relres_irq(gc, d->hwirq);
>> }
>>
>> +static void gpiochip_irq_mask(struct irq_data *d)
>> +{
>> + struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
>> +
>> + if (chip->irq.irq_mask)
>> + chip->irq.irq_mask(d);
>> + gpiochip_disable_irq(chip, d->hwirq);
>> +}
>> +
>> +static void gpiochip_irq_unmask(struct irq_data *d)
>> +{
>> + struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
>> +
>> + gpiochip_enable_irq(chip, d->hwirq);
>> + if (chip->irq.irq_unmask)
>> + chip->irq.irq_unmask(d);
>> +}
>> +
>> static void gpiochip_irq_enable(struct irq_data *d)
>> {
>> struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>>
>> - gpiochip_enable_irq(gc, d->hwirq);
>> - if (gc->irq.irq_enable)
>> - gc->irq.irq_enable(d);
>> - else
>> - gc->irq.chip->irq_unmask(d);
>> + gpiochip_enable_irq(chip, d->hwirq);
>
> You really never compiled this, did you?
>
> I've stopped looking at this. Please send something that you will have
> actually tested.
>
> M.
Apologies.
I did tested out on internal devices based on kernel 5.4 as well as
linux-next with sc7180.
While posting i somehow taken patch from kernel 5.4 and messed up this
patch during merge conflicts.
I fixed this in v2 and posted out changes that cleanly applies on latest
linux-next tag (next-20200521).
Thanks,
Maulik
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2020-05-23 17:07 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-22 13:19 [PATCH 0/4] irqchip: qcom: pdc: Introduce irq_set_wake call Maulik Shah
2020-05-22 13:19 ` [PATCH 1/4] gpio: gpiolib: Allow GPIO IRQs to lazy disable Maulik Shah
2020-05-23 9:42 ` Marc Zyngier
2020-05-23 17:06 ` Maulik Shah [this message]
2020-05-23 12:30 ` kbuild test robot
2020-05-22 13:19 ` [PATCH 2/4] pinctrl: qcom: Remove irq_disable callback from msmgpio irqchip Maulik Shah
2020-05-22 13:19 ` [PATCH 3/4] pinctrl: qcom: Add msmgpio irqchip flags Maulik Shah
2020-05-22 13:19 ` [PATCH 4/4] irqchip: qcom-pdc: Introduce irq_set_wake call Maulik Shah
2020-05-25 11:34 ` [PATCH 0/4] irqchip: qcom: pdc: " Linus Walleij
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