linux-kernel - Re: [PATCH -next] media: av7110

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Date:   Tue, 1 Jun 2021 11:16:17 +0200
From:   Mauro Carvalho Chehab <mchehab@...nel.org>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] media: av7110_v4l: Fix build error

Em Wed, 9 Sep 2020 21:38:44 +0800
YueHaibing <yuehaibing@...wei.com> escreveu:

> drivers/media/pci/ttpci/av7110_v4l.c: In function ‘vidioc_s_frequency’:
> drivers/media/pci/ttpci/av7110_v4l.c:163:11: error: SSE register return with SSE disabled
>   if (freq < 16U * 168.25)
>       ~~~~~^~~~~~~~~~~~~~
> Get rid of float pointing math to fix this.

Out of curiosity: what compiler are you using? This sounds to be a compiler
issue, as compiler should be optimizing the code by doing the math evaluation
at compile time instead of doing it during runtime.

> 
> Fixes: 13c129066845 ("media: av7110_v4l: avoid a typecast")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>  drivers/media/pci/ttpci/av7110_v4l.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/pci/ttpci/av7110_v4l.c b/drivers/media/pci/ttpci/av7110_v4l.c
> index 6d9c908be713..ba745b161cba 100644
> --- a/drivers/media/pci/ttpci/av7110_v4l.c
> +++ b/drivers/media/pci/ttpci/av7110_v4l.c
> @@ -160,9 +160,9 @@ static int ves1820_set_tv_freq(struct saa7146_dev *dev, u32 freq)
>  	buf[1] = div & 0xff;
>  	buf[2] = 0x8e;
>  
> -	if (freq < 16U * 168.25)
> +	if (freq < (16 * 16825) / 100)
>  		config = 0xa0;
> -	else if (freq < 16U * 447.25)
> +	else if (freq < (16 * 44725) / 100)
>  		config = 0x90;
>  	else
>  		config = 0x30;



Thanks,
Mauro