linux-kernel - Re: [PATCH v5 09/15] clk: at91: clk-master: mask mckr against layout->mask

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Message-ID: <579573e1-ab48-75b2-b185-5885ac5a15c5@microchip.com>
Date:   Fri, 15 Oct 2021 09:56:42 +0200
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>,
        <mturquette@...libre.com>, <sboyd@...nel.org>,
        <alexandre.belloni@...tlin.com>, <ludovic.desroches@...rochip.com>
CC:     <linux-clk@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 09/15] clk: at91: clk-master: mask mckr against
 layout->mask

On 11/10/2021 at 13:27, Claudiu Beznea wrote:
> Mask values read/written from/to MCKR against layout->mask as this
> mask may be different b/w PMC versions.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>

> ---
>   drivers/clk/at91/clk-master.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c
> index 2093e13b5068..6da9ae34313a 100644
> --- a/drivers/clk/at91/clk-master.c
> +++ b/drivers/clk/at91/clk-master.c
> @@ -186,8 +186,8 @@ static int clk_master_div_set_rate(struct clk_hw *hw, unsigned long rate,
>   	if (ret)
>   		goto unlock;
>   
> -	tmp = mckr & master->layout->mask;
> -	tmp = (tmp >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
> +	mckr &= master->layout->mask;
> +	tmp = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
>   	if (tmp == div)
>   		goto unlock;
>   
> @@ -384,6 +384,7 @@ static unsigned long clk_master_pres_recalc_rate(struct clk_hw *hw,
>   	regmap_read(master->regmap, master->layout->offset, &val);
>   	spin_unlock_irqrestore(master->lock, flags);
>   
> +	val &= master->layout->mask;
>   	pres = (val >> master->layout->pres_shift) & MASTER_PRES_MASK;
>   	if (pres == 3 && characteristics->have_div3_pres)
>   		pres = 3;
> @@ -403,6 +404,8 @@ static u8 clk_master_pres_get_parent(struct clk_hw *hw)
>   	regmap_read(master->regmap, master->layout->offset, &mckr);
>   	spin_unlock_irqrestore(master->lock, flags);
>   
> +	mckr &= master->layout->mask;
> +
>   	return mckr & AT91_PMC_CSS;
>   }
>   
> 


-- 
Nicolas Ferre