linux-kernel - Re: [PATCH] pinctrl: rockchip: don't disable clk when irq mask is already set

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Message-ID: <fb4ec747-fde3-142b-1963-be3b9cfab260@rock-chips.com>
Date:   Sat, 24 Sep 2016 18:24:11 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Jacob Chen <jacob-chen@...wrt.com>, linux-kernel@...r.kernel.org
Cc:     shawn.lin@...k-chips.com, linux-rockchip@...ts.infradead.org,
        linus.walleij@...aro.org, Jacob Chen <jacob2.chen@...k-chips.com>,
        heiko@...ech.de, linux-gpio@...r.kernel.org
Subject: Re: [PATCH] pinctrl: rockchip: don't disable clk when irq mask is
 already set

On 2016/9/24 2:26, Jacob Chen wrote:
> From: Jacob Chen <jacob2.chen@...k-chips.com>
>
> In some drivers, disable_irq() call don't be symmetric with enable_irq()
> , disable_irq() will be called before call free_irq().

Which upstream drivers you refer to?

Shouldn't it be the unbalanced call for these drivers?

>
> But both disable_irq() and free_irq() will call rockchip_irq_gc_mask_set_bit,
>  and clk_disable() will be called more times than clk_enable(), which will
> cause bugs.
>
> I think we can correct that by checking of mask.If mask is already set, do nothing.
>

Looks like a little hacky to me.

> Change-Id: If19912c7658253e15531c04db6c70fdbffd5960a

remove this.

> Signed-off-by: Jacob Chen <jacob2.chen@...k-chips.com>
> ---
>  drivers/pinctrl/pinctrl-rockchip.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
> index c6c04ac..9a8804a 100644
> --- a/drivers/pinctrl/pinctrl-rockchip.c
> +++ b/drivers/pinctrl/pinctrl-rockchip.c
> @@ -2334,8 +2334,12 @@ static void rockchip_irq_gc_mask_clr_bit(struct irq_data *d)
>  void rockchip_irq_gc_mask_set_bit(struct irq_data *d)
>  {
>  	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
> +	struct irq_chip_type *ct = irq_data_get_chip_type(d);
>  	struct rockchip_pin_bank *bank = gc->private;
>
> +	if (*ct->mask_cache & d->mask)
> +		return;
> +
>  	irq_gc_mask_set_bit(d);
>  	clk_disable(bank->clk);
>  }
> --
> 2.7.4
>
>
> _______________________________________________
> Linux-rockchip mailing list
> Linux-rockchip@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-rockchip
>

-- 
Best Regards
Shawn Lin

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