linux-kernel - Re: [PATCH 2/3] gpio: sprd: In the sleep state, the eic dbnc clk must be forced open

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Date:   Wed, 9 Aug 2023 09:29:07 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Wenhua Lin <Wenhua.Lin@...soc.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andy@...nel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        wenhua lin <wenhua.lin1994@...il.com>,
        Xiongpeng Wu <xiongpeng.wu@...soc.com>
Subject: Re: [PATCH 2/3] gpio: sprd: In the sleep state, the eic dbnc clk must
 be forced open



On 8/8/2023 11:31 AM, Wenhua Lin wrote:
> In the sleep state, Eic dbnc has no clock and the clk enable
> of dbnc needs to be forced open, so that eic can wake up normally.

Sounds reasonable to me. Should add a Fixes tag if need to backport for 
stable kernel?

> Signed-off-by: Wenhua Lin <Wenhua.Lin@...soc.com>
> ---
>   drivers/gpio/gpio-eic-sprd.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpio/gpio-eic-sprd.c b/drivers/gpio/gpio-eic-sprd.c
> index 0d85d9e80848..c506cfd6df8e 100644
> --- a/drivers/gpio/gpio-eic-sprd.c
> +++ b/drivers/gpio/gpio-eic-sprd.c
> @@ -23,6 +23,7 @@
>   #define SPRD_EIC_DBNC_IC		0x24
>   #define SPRD_EIC_DBNC_TRIG		0x28
>   #define SPRD_EIC_DBNC_CTRL0		0x40
> +#define SPRD_EIC_DBNC_FORCE_CLK		0x8000
>   
>   #define SPRD_EIC_LATCH_INTEN		0x0
>   #define SPRD_EIC_LATCH_INTRAW		0x4
> @@ -213,6 +214,7 @@ static int sprd_eic_set_debounce(struct gpio_chip *chip, unsigned int offset,
>   	u32 value = readl_relaxed(base + reg) & ~SPRD_EIC_DBNC_MASK;
>   
>   	value |= (debounce / 1000) & SPRD_EIC_DBNC_MASK;
> +	value |= SPRD_EIC_DBNC_FORCE_CLK;
>   	writel_relaxed(value, base + reg);
>   
>   	return 0;