linux-kernel - Re: [PATCH v1 1/1] mfd: intel-lpss: Fix the fractional clock divider flags

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Message-ID: <20231213161352.GQ111411@google.com>
Date:   Wed, 13 Dec 2023 16:13:52 +0000
From:   Lee Jones <lee@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org,
        Alex Vinarskis <alex.vinarskis@...il.com>
Subject: Re: [PATCH v1 1/1] mfd: intel-lpss: Fix the fractional clock divider
 flags

On Mon, 11 Dec 2023, Andy Shevchenko wrote:

> The conversion to CLK_FRAC_DIVIDER_POWER_OF_TWO_PS uses wrong flags
> in the parameters and hence miscalculates the values in the clock
> divider. Fix this by applying the flag to the proper parameter.
> 
> Fixes: 82f53f9ee577 ("clk: fractional-divider: Introduce POWER_OF_TWO_PS flag")
> Reported-by: Alex Vinarskis <alex.vinarskis@...il.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/mfd/intel-lpss.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/intel-lpss.c b/drivers/mfd/intel-lpss.c
> index 177915845ba2..eff423f7dd28 100644
> --- a/drivers/mfd/intel-lpss.c
> +++ b/drivers/mfd/intel-lpss.c
> @@ -309,8 +309,8 @@ static int intel_lpss_register_clock_divider(struct intel_lpss *lpss,
>  
>  	snprintf(name, sizeof(name), "%s-div", devname);
>  	tmp = clk_register_fractional_divider(NULL, name, __clk_get_name(tmp),
> +					      0, lpss->priv, 1, 15, 16, 15,
>  					      CLK_FRAC_DIVIDER_POWER_OF_TWO_PS,
> -					      lpss->priv, 1, 15, 16, 15, 0,
>  					      NULL);

What an ugly interface.  Intel-only too, right?

Have you also fixed this in: drivers/acpi/acpi_lpss.c

>  	if (IS_ERR(tmp))
>  		return PTR_ERR(tmp);
> -- 
> 2.43.0.rc1.1.gbec44491f096
> 

-- 
Lee Jones [李琼斯]