linux-kernel - Re: [PATCH 4/4] media: cxd2820r: use DIV_ROUND_CLOSEST

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Date:	Fri, 20 Mar 2015 13:17:54 +0200
From:	Antti Palosaari <crope@....fi>
To:	Javi Merino <javi.merino@....com>, akpm@...ux-foundation.org
CC:	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@....samsung.com>
Subject: Re: [PATCH 4/4] media: cxd2820r: use DIV_ROUND_CLOSEST_ULL()

On 03/20/2015 01:14 PM, Javi Merino wrote:
> Now that the kernel provides DIV_ROUND_CLOSEST_ULL(), drop the internal
> implementation and use the kernel one.
>
> Cc: Antti Palosaari <crope@....fi>
> Cc: Mauro Carvalho Chehab <mchehab@....samsung.com>
> Signed-off-by: Javi Merino <javi.merino@....com>

Acked-by: Antti Palosaari <crope@....fi>
Reviewed-by: Antti Palosaari <crope@....fi>


Antti

> ---
> I've only compile-tested it, I don't have the hardware to run it.
>
>   drivers/media/dvb-frontends/cxd2820r_c.c    | 2 +-
>   drivers/media/dvb-frontends/cxd2820r_core.c | 6 ------
>   drivers/media/dvb-frontends/cxd2820r_priv.h | 2 --
>   drivers/media/dvb-frontends/cxd2820r_t.c    | 2 +-
>   drivers/media/dvb-frontends/cxd2820r_t2.c   | 2 +-
>   5 files changed, 3 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/media/dvb-frontends/cxd2820r_c.c b/drivers/media/dvb-frontends/cxd2820r_c.c
> index 149fdca3fb44..72b0e2db3aab 100644
> --- a/drivers/media/dvb-frontends/cxd2820r_c.c
> +++ b/drivers/media/dvb-frontends/cxd2820r_c.c
> @@ -79,7 +79,7 @@ int cxd2820r_set_frontend_c(struct dvb_frontend *fe)
>
>   	num = if_freq / 1000; /* Hz => kHz */
>   	num *= 0x4000;
> -	if_ctl = 0x4000 - cxd2820r_div_u64_round_closest(num, 41000);
> +	if_ctl = 0x4000 - DIV_ROUND_CLOSEST_ULL(num, 41000);
>   	buf[0] = (if_ctl >> 8) & 0x3f;
>   	buf[1] = (if_ctl >> 0) & 0xff;
>
> diff --git a/drivers/media/dvb-frontends/cxd2820r_core.c b/drivers/media/dvb-frontends/cxd2820r_core.c
> index 422e84bbb008..490e090048ef 100644
> --- a/drivers/media/dvb-frontends/cxd2820r_core.c
> +++ b/drivers/media/dvb-frontends/cxd2820r_core.c
> @@ -244,12 +244,6 @@ error:
>   	return ret;
>   }
>
> -/* 64 bit div with round closest, like DIV_ROUND_CLOSEST but 64 bit */
> -u32 cxd2820r_div_u64_round_closest(u64 dividend, u32 divisor)
> -{
> -	return div_u64(dividend + (divisor / 2), divisor);
> -}
> -
>   static int cxd2820r_set_frontend(struct dvb_frontend *fe)
>   {
>   	struct cxd2820r_priv *priv = fe->demodulator_priv;
> diff --git a/drivers/media/dvb-frontends/cxd2820r_priv.h b/drivers/media/dvb-frontends/cxd2820r_priv.h
> index 7ff5f60c83e1..4b428959b16e 100644
> --- a/drivers/media/dvb-frontends/cxd2820r_priv.h
> +++ b/drivers/media/dvb-frontends/cxd2820r_priv.h
> @@ -64,8 +64,6 @@ int cxd2820r_wr_reg_mask(struct cxd2820r_priv *priv, u32 reg, u8 val,
>   int cxd2820r_wr_regs(struct cxd2820r_priv *priv, u32 reginfo, u8 *val,
>   	int len);
>
> -u32 cxd2820r_div_u64_round_closest(u64 dividend, u32 divisor);
> -
>   int cxd2820r_wr_regs(struct cxd2820r_priv *priv, u32 reginfo, u8 *val,
>   	int len);
>
> diff --git a/drivers/media/dvb-frontends/cxd2820r_t.c b/drivers/media/dvb-frontends/cxd2820r_t.c
> index 51401d036530..008cb2ac8480 100644
> --- a/drivers/media/dvb-frontends/cxd2820r_t.c
> +++ b/drivers/media/dvb-frontends/cxd2820r_t.c
> @@ -103,7 +103,7 @@ int cxd2820r_set_frontend_t(struct dvb_frontend *fe)
>
>   	num = if_freq / 1000; /* Hz => kHz */
>   	num *= 0x1000000;
> -	if_ctl = cxd2820r_div_u64_round_closest(num, 41000);
> +	if_ctl = DIV_ROUND_CLOSEST_ULL(num, 41000);
>   	buf[0] = ((if_ctl >> 16) & 0xff);
>   	buf[1] = ((if_ctl >>  8) & 0xff);
>   	buf[2] = ((if_ctl >>  0) & 0xff);
> diff --git a/drivers/media/dvb-frontends/cxd2820r_t2.c b/drivers/media/dvb-frontends/cxd2820r_t2.c
> index 9c0c4f42175c..35fe364c7182 100644
> --- a/drivers/media/dvb-frontends/cxd2820r_t2.c
> +++ b/drivers/media/dvb-frontends/cxd2820r_t2.c
> @@ -120,7 +120,7 @@ int cxd2820r_set_frontend_t2(struct dvb_frontend *fe)
>
>   	num = if_freq / 1000; /* Hz => kHz */
>   	num *= 0x1000000;
> -	if_ctl = cxd2820r_div_u64_round_closest(num, 41000);
> +	if_ctl = DIV_ROUND_CLOSEST_ULL(num, 41000);
>   	buf[0] = ((if_ctl >> 16) & 0xff);
>   	buf[1] = ((if_ctl >>  8) & 0xff);
>   	buf[2] = ((if_ctl >>  0) & 0xff);
>

-- 
http://palosaari.fi/
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