linux-kernel - Re: [PATCH] gpio: zynq: restore zynq_gpio_irq_reqres/zynq_gpio_irq

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Date:   Wed, 6 Sep 2023 15:49:21 +0200
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Daniel Mack <daniel@...que.org>, linux-gpio@...r.kernel.org,
        manikanta.guntupalli@....com
Cc:     linux-kernel@...r.kernel.org, stable@...nel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linux kernel regressions list <regressions@...ts.linux.dev>
Subject: Re: [PATCH] gpio: zynq: restore
 zynq_gpio_irq_reqres/zynq_gpio_irq_relres callbacks

CCing Arnd (wrote the culprit), Linus (reviewed it), Bartosz (applied
it), and the regressions mailing list

On 01.09.23 14:24, Daniel Mack wrote:
> Commit f56914393537 ("gpio: zynq: fix zynqmp_gpio not an immutable chip
> warning") ditched the open-coded resource allocation handlers in favor
> of the generic ones. These generic handlers don't maintain the PM
> runtime anymore, which causes a regression in that level IRQs are no
> longer reported.
> 
> Restore the original handlers to fix this.
> 
> Signed-off-by: Daniel Mack <daniel@...que.org>
> Fixes: f56914393537 ("gpio: zynq: fix zynqmp_gpio not an immutable chip warning")
> Cc: stable@...nel.org

This seems to be a regression report that comes straight with a fix, but
there wasn't a single reply yet afaics. :-/ Maybe the extended list of
recipients will get things moving. But to ensure this doesn't fall
through the cracks, I'll add it to the list of tracked regressions.

#regzbot ^introduced f56914393537
#regzbot title gpio: zynq: in that level IRQs are no longer reported
#regzbot fix: gpio: zynq: restore
zynq_gpio_irq_reqres/zynq_gpio_irq_relres callbacks
#regzbot ignore-activity

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.

> ---
>  drivers/gpio/gpio-zynq.c | 26 ++++++++++++++++++++++++--
>  1 file changed, 24 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
> index 0a7264aabe48..324e942c0650 100644
> --- a/drivers/gpio/gpio-zynq.c
> +++ b/drivers/gpio/gpio-zynq.c
> @@ -575,6 +575,26 @@ static int zynq_gpio_set_wake(struct irq_data *data, unsigned int on)
>  	return 0;
>  }
>  
> +static int zynq_gpio_irq_reqres(struct irq_data *d)
> +{
> +	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
> +	int ret;
> +
> +	ret = pm_runtime_resume_and_get(chip->parent);
> +	if (ret < 0)
> +		return ret;
> +
> +	return gpiochip_reqres_irq(chip, d->hwirq);
> +}
> +
> +static void zynq_gpio_irq_relres(struct irq_data *d)
> +{
> +	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
> +
> +	gpiochip_relres_irq(chip, d->hwirq);
> +	pm_runtime_put(chip->parent);
> +}
> +
>  /* irq chip descriptor */
>  static const struct irq_chip zynq_gpio_level_irqchip = {
>  	.name		= DRIVER_NAME,
> @@ -584,9 +604,10 @@ static const struct irq_chip zynq_gpio_level_irqchip = {
>  	.irq_unmask	= zynq_gpio_irq_unmask,
>  	.irq_set_type	= zynq_gpio_set_irq_type,
>  	.irq_set_wake	= zynq_gpio_set_wake,
> +	.irq_request_resources = zynq_gpio_irq_reqres,
> +	.irq_release_resources = zynq_gpio_irq_relres,
>  	.flags		= IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED |
>  			  IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
> -	GPIOCHIP_IRQ_RESOURCE_HELPERS,
>  };
>  
>  static const struct irq_chip zynq_gpio_edge_irqchip = {
> @@ -597,8 +618,9 @@ static const struct irq_chip zynq_gpio_edge_irqchip = {
>  	.irq_unmask	= zynq_gpio_irq_unmask,
>  	.irq_set_type	= zynq_gpio_set_irq_type,
>  	.irq_set_wake	= zynq_gpio_set_wake,
> +	.irq_request_resources = zynq_gpio_irq_reqres,
> +	.irq_release_resources = zynq_gpio_irq_relres,
>  	.flags		= IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
> -	GPIOCHIP_IRQ_RESOURCE_HELPERS,
>  };
>  
>  static void zynq_gpio_handle_bank_irq(struct zynq_gpio *gpio,