linux-kernel - Re: [PATCH 3/6] pinctrl: rockchip: create irq mapping in gpio_to

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Date:   Sun, 06 Sep 2020 00:03:50 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     linus.walleij@...aro.org, Jianqun Xu <jay.xu@...k-chips.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        Jianqun Xu <jay.xu@...k-chips.com>
Subject: Re: [PATCH 3/6] pinctrl: rockchip: create irq mapping in gpio_to_irq

Am Montag, 31. August 2020, 10:47:50 CEST schrieb Jianqun Xu:
> Remove totally irq mappings create in probe, the gpio irq mapping will
> be created when do
>     gpio_to_irq ->
>         rockchip_gpio_to_irq ->
>             irq_create_mapping
> 
> This patch can speed up system boot on, also abandon many unused irq
> mappings' create.
> 
> Signed-off-by: Jianqun Xu <jay.xu@...k-chips.com>

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

> ---
>  drivers/pinctrl/pinctrl-rockchip.c | 28 ++++++++++++----------------
>  1 file changed, 12 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
> index 54abda7b7be8..265d64b8c4f5 100644
> --- a/drivers/pinctrl/pinctrl-rockchip.c
> +++ b/drivers/pinctrl/pinctrl-rockchip.c
> @@ -3196,7 +3196,7 @@ static void rockchip_irq_demux(struct irq_desc *desc)
>  
>  		irq = __ffs(pend);
>  		pend &= ~BIT(irq);
> -		virq = irq_linear_revmap(bank->domain, irq);
> +		virq = irq_find_mapping(bank->domain, irq);
>  
>  		if (!virq) {
>  			dev_err(bank->drvdata->dev, "unmapped irq %d\n", irq);
> @@ -3375,7 +3375,7 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
>  	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
>  	struct irq_chip_generic *gc;
>  	int ret;
> -	int i, j;
> +	int i;
>  
>  	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
>  		if (!bank->valid) {
> @@ -3402,7 +3402,7 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
>  
>  		ret = irq_alloc_domain_generic_chips(bank->domain, 32, 1,
>  					 "rockchip_gpio_irq", handle_level_irq,
> -					 clr, 0, IRQ_GC_INIT_MASK_CACHE);
> +					 clr, 0, 0);
>  		if (ret) {
>  			dev_err(&pdev->dev, "could not alloc generic chips for bank %s\n",
>  				bank->name);
> @@ -3411,14 +3411,6 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
>  			continue;
>  		}
>  
> -		/*
> -		 * Linux assumes that all interrupts start out disabled/masked.
> -		 * Our driver only uses the concept of masked and always keeps
> -		 * things enabled, so for us that's all masked and all enabled.
> -		 */
> -		writel_relaxed(0xffffffff, bank->reg_base + GPIO_INTMASK);
> -		writel_relaxed(0xffffffff, bank->reg_base + GPIO_INTEN);
> -
>  		gc = irq_get_domain_generic_chip(bank->domain, 0);
>  		gc->reg_base = bank->reg_base;
>  		gc->private = bank;
> @@ -3435,13 +3427,17 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
>  		gc->chip_types[0].chip.irq_set_type = rockchip_irq_set_type;
>  		gc->wake_enabled = IRQ_MSK(bank->nr_pins);
>  
> +		/*
> +		 * Linux assumes that all interrupts start out disabled/masked.
> +		 * Our driver only uses the concept of masked and always keeps
> +		 * things enabled, so for us that's all masked and all enabled.
> +		 */
> +		writel_relaxed(0xffffffff, bank->reg_base + GPIO_INTMASK);
> +		writel_relaxed(0xffffffff, bank->reg_base + GPIO_INTEN);
> +		gc->mask_cache = 0xffffffff;
> +
>  		irq_set_chained_handler_and_data(bank->irq,
>  						 rockchip_irq_demux, bank);
> -
> -		/* map the gpio irqs here, when the clock is still running */
> -		for (j = 0 ; j < 32 ; j++)
> -			irq_create_mapping(bank->domain, j);
> -
>  		clk_disable(bank->clk);
>  	}
>  
>