linux-kernel - Re: [PATCH] irqchip: gpcv2: remove unnecessary functions

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Date:   Wed, 23 May 2018 08:22:54 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Anson Huang <Anson.Huang@....com>
Cc:     <tglx@...utronix.de>, <jason@...edaemon.net>, <Linux-imx@....com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] irqchip: gpcv2: remove unnecessary functions

On Wed, 23 May 2018 07:23:00 +0100,
Anson Huang wrote:
> 
> GPC is in always-on domain, it never lost its
> content during suspend/resume, so no need to
> do save/restore for it during suspend/resume.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
>  drivers/irqchip/irq-imx-gpcv2.c | 41 -----------------------------------------
>  1 file changed, 41 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-imx-gpcv2.c b/drivers/irqchip/irq-imx-gpcv2.c
> index 4760307..e6025d9 100644
> --- a/drivers/irqchip/irq-imx-gpcv2.c
> +++ b/drivers/irqchip/irq-imx-gpcv2.c
> @@ -28,46 +28,6 @@ struct gpcv2_irqchip_data {
>  
>  static struct gpcv2_irqchip_data *imx_gpcv2_instance;
>  
> -static int gpcv2_wakeup_source_save(void)
> -{
> -	struct gpcv2_irqchip_data *cd;
> -	void __iomem *reg;
> -	int i;
> -
> -	cd = imx_gpcv2_instance;
> -	if (!cd)
> -		return 0;
> -
> -	for (i = 0; i < IMR_NUM; i++) {
> -		reg = cd->gpc_base + cd->cpu2wakeup + i * 4;
> -		cd->saved_irq_mask[i] = readl_relaxed(reg);
> -		writel_relaxed(cd->wakeup_sources[i], reg);
> -	}

If you're removing that code, what's the purpose of keeping
saved_irq_mask?

Also, who is now programming the wake-up_source? For good or bad
reasons, this drivers uses the save/restore hooks to program the
wake-up state. Removing this code seem to simply kill the feature.

What am I missing?

Thanks,

	M.

-- 
Jazz is not dead, it just smell funny.