linux-kernel - Re: [PATCH] pinctrl: rockchip: add irq_enable & irq

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Date:   Wed, 15 Mar 2017 18:46:38 +0100
From:   Heiko Stuebner <heiko@...ech.de>
To:     Jeffy Chen <jeffy.chen@...k-chips.com>,
        John Keeping <john@...anate.com>
Cc:     linux-gpio@...r.kernel.org,
        Brian Norris <briannorris@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        linux-rockchip@...ts.infradead.org,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] pinctrl: rockchip: add irq_enable & irq_disable ops

Am Donnerstag, 2. März 2017, 13:56:52 CET schrieb Jeffy Chen:
> Currently we are trying to enable/disable the clk of irq's gpio bank when
> unmask/mask irq. But the kernel's "lazy disable approach" will skip masking
> irq when the irq chip doesn't support irq_disable ops.
> 
> So we may hit this case:
> 	irq_enable-> enable clk
> 	irq_disable-> noop
> 	irq_enable-> enable clk again
> 	irq_disable-> noop
> 
> Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>

While I'm not that versed in irqchip details, reading through some other 
irqchips makes this look correct handling, so also makes sense in the context 
of the pinctrl irqs here

Reviewed-by: Heiko Stuebner <heiko@...ech.de>

> ---
> 
>  drivers/pinctrl/pinctrl-rockchip.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-rockchip.c
> b/drivers/pinctrl/pinctrl-rockchip.c index 7813599..a9a7dfa 100644
> --- a/drivers/pinctrl/pinctrl-rockchip.c
> +++ b/drivers/pinctrl/pinctrl-rockchip.c
> @@ -2061,7 +2061,7 @@ static void rockchip_irq_resume(struct irq_data *d)
>  	clk_disable(bank->clk);
>  }
> 
> -static void rockchip_irq_gc_mask_clr_bit(struct irq_data *d)
> +static void rockchip_irq_enable(struct irq_data *d)
>  {
>  	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>  	struct rockchip_pin_bank *bank = gc->private;
> @@ -2070,7 +2070,7 @@ static void rockchip_irq_gc_mask_clr_bit(struct
> irq_data *d) irq_gc_mask_clr_bit(d);
>  }
> 
> -static void rockchip_irq_gc_mask_set_bit(struct irq_data *d)
> +static void rockchip_irq_disable(struct irq_data *d)
>  {
>  	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
>  	struct rockchip_pin_bank *bank = gc->private;
> @@ -2137,9 +2137,10 @@ static int rockchip_interrupts_register(struct
> platform_device *pdev, gc->chip_types[0].regs.mask = GPIO_INTMASK;
>  		gc->chip_types[0].regs.ack = GPIO_PORTS_EOI;
>  		gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
> -		gc->chip_types[0].chip.irq_mask = rockchip_irq_gc_mask_set_bit;
> -		gc->chip_types[0].chip.irq_unmask =
> -						  rockchip_irq_gc_mask_clr_bit;
> +		gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
> +		gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit;
> +		gc->chip_types[0].chip.irq_enable = rockchip_irq_enable;
> +		gc->chip_types[0].chip.irq_disable = rockchip_irq_disable;
>  		gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
>  		gc->chip_types[0].chip.irq_suspend = rockchip_irq_suspend;
>  		gc->chip_types[0].chip.irq_resume = rockchip_irq_resume;