linux-kernel - Re: [PATCH] irq-renesas-irqc: simplify irq_set

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Date:	Thu, 19 Dec 2013 17:24:56 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	tglx@...utronix.de, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org, magnus.damm@...il.com
Subject: Re: [PATCH] irq-renesas-irqc: simplify irq_set_type() method

On Sat, Dec 14, 2013 at 03:09:31AM +0300, Sergei Shtylyov wrote:
> Value 0 of the sense  selection field of CONFIG_n register means "disable event
> detection" and serves in irqc_sense[] for marking the invalid values of the IRQ
> type (by just omitting initializers). There is no need for INTC_IRQ_SENSE_VALID
> and hence INTC_IRQ_SENSE() as all field values matching to the  valid IRQ types
> are non-zero anyway.
> 
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

Magnus, could you review this?

> 
> ---
> The patch is against the 'irq/core' branch of the 'tip.git' repo.
> 
>  drivers/irqchip/irq-renesas-irqc.c |   17 +++++++----------
>  1 file changed, 7 insertions(+), 10 deletions(-)
> 
> Index: renesas/drivers/irqchip/irq-renesas-irqc.c
> ===================================================================
> --- renesas.orig/drivers/irqchip/irq-renesas-irqc.c
> +++ renesas/drivers/irqchip/irq-renesas-irqc.c
> @@ -81,15 +81,12 @@ static void irqc_irq_disable(struct irq_
>  	iowrite32(BIT(hw_irq), p->cpu_int_base + IRQC_EN_STS);
>  }
>  
> -#define INTC_IRQ_SENSE_VALID 0x10
> -#define INTC_IRQ_SENSE(x) (x + INTC_IRQ_SENSE_VALID)
> -
>  static unsigned char irqc_sense[IRQ_TYPE_SENSE_MASK + 1] = {
> -	[IRQ_TYPE_LEVEL_LOW] = INTC_IRQ_SENSE(0x01),
> -	[IRQ_TYPE_LEVEL_HIGH] = INTC_IRQ_SENSE(0x02),
> -	[IRQ_TYPE_EDGE_FALLING] = INTC_IRQ_SENSE(0x04), /* Synchronous */
> -	[IRQ_TYPE_EDGE_RISING] = INTC_IRQ_SENSE(0x08), /* Synchronous */
> -	[IRQ_TYPE_EDGE_BOTH] = INTC_IRQ_SENSE(0x0c),  /* Synchronous */
> +	[IRQ_TYPE_LEVEL_LOW]	= 0x01,
> +	[IRQ_TYPE_LEVEL_HIGH]	= 0x02,
> +	[IRQ_TYPE_EDGE_FALLING]	= 0x04,	/* Synchronous */
> +	[IRQ_TYPE_EDGE_RISING]	= 0x08,	/* Synchronous */
> +	[IRQ_TYPE_EDGE_BOTH]	= 0x0c,	/* Synchronous */
>  };
>  
>  static int irqc_irq_set_type(struct irq_data *d, unsigned int type)
> @@ -101,12 +98,12 @@ static int irqc_irq_set_type(struct irq_
>  
>  	irqc_dbg(&p->irq[hw_irq], "sense");
>  
> -	if (!(value & INTC_IRQ_SENSE_VALID))
> +	if (!value)
>  		return -EINVAL;
>  
>  	tmp = ioread32(p->iomem + IRQC_CONFIG(hw_irq));
>  	tmp &= ~0x3f;
> -	tmp |= value ^ INTC_IRQ_SENSE_VALID;
> +	tmp |= value;
>  	iowrite32(tmp, p->iomem + IRQC_CONFIG(hw_irq));
>  	return 0;
>  }
> --
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