netdev - Re: [PATCH/RFC 17/17] rtw89: Use bitfield helpers

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Date:   Mon, 22 Nov 2021 12:38:41 -0600
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Paul Walmsley <paul@...an.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Tero Kristo <kristo@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Benoit Parrot <bparrot@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andrew Jeffery <andrew@...id.au>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Joel Stanley <joel@....id.au>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Keerthy <j-keerthy@...com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-media@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-aspeed@...ts.ozlabs.org, openbmc@...ts.ozlabs.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-pm@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH/RFC 17/17] rtw89: Use bitfield helpers

On 11/22/21 09:54, Geert Uytterhoeven wrote:
> Use the field_{get,prep}() helpers, instead of open-coding the same
> operations.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> Compile-tested only.
> Marked RFC, as this depends on [PATCH 01/17], but follows a different
> path to upstream.
> ---
>   drivers/net/wireless/realtek/rtw89/core.h | 38 ++++-------------------
>   1 file changed, 6 insertions(+), 32 deletions(-)

Tested-by: Larry Finger <Larry,Finger@...inger.net>

Larry

> 
> diff --git a/drivers/net/wireless/realtek/rtw89/core.h b/drivers/net/wireless/realtek/rtw89/core.h
> index c2885e4dd882f045..f9c0300ec373aaf2 100644
> --- a/drivers/net/wireless/realtek/rtw89/core.h
> +++ b/drivers/net/wireless/realtek/rtw89/core.h
> @@ -2994,81 +2994,55 @@ rtw89_write32_clr(struct rtw89_dev *rtwdev, u32 addr, u32 bit)
>   static inline u32
>   rtw89_read32_mask(struct rtw89_dev *rtwdev, u32 addr, u32 mask)
>   {
> -	u32 shift = __ffs(mask);
> -	u32 orig;
> -	u32 ret;
> -
> -	orig = rtw89_read32(rtwdev, addr);
> -	ret = (orig & mask) >> shift;
> -
> -	return ret;
> +	return field_get(mask, rtw89_read32(rtwdev, addr));
>   }
>   
>   static inline u16
>   rtw89_read16_mask(struct rtw89_dev *rtwdev, u32 addr, u32 mask)
>   {
> -	u32 shift = __ffs(mask);
> -	u32 orig;
> -	u32 ret;
> -
> -	orig = rtw89_read16(rtwdev, addr);
> -	ret = (orig & mask) >> shift;
> -
> -	return ret;
> +	return field_get(mask, rtw89_read16(rtwdev, addr));
>   }
>   
>   static inline u8
>   rtw89_read8_mask(struct rtw89_dev *rtwdev, u32 addr, u32 mask)
>   {
> -	u32 shift = __ffs(mask);
> -	u32 orig;
> -	u32 ret;
> -
> -	orig = rtw89_read8(rtwdev, addr);
> -	ret = (orig & mask) >> shift;
> -
> -	return ret;
> +	return field_get(mask, rtw89_read8(rtwdev, addr));
>   }
>   
>   static inline void
>   rtw89_write32_mask(struct rtw89_dev *rtwdev, u32 addr, u32 mask, u32 data)
>   {
> -	u32 shift = __ffs(mask);
>   	u32 orig;
>   	u32 set;
>   
>   	WARN(addr & 0x3, "should be 4-byte aligned, addr = 0x%08x\n", addr);
>   
>   	orig = rtw89_read32(rtwdev, addr);
> -	set = (orig & ~mask) | ((data << shift) & mask);
> +	set = (orig & ~mask) | field_prep(mask, data);
>   	rtw89_write32(rtwdev, addr, set);
>   }
>   
>   static inline void
>   rtw89_write16_mask(struct rtw89_dev *rtwdev, u32 addr, u32 mask, u16 data)
>   {
> -	u32 shift;
>   	u16 orig, set;
>   
>   	mask &= 0xffff;
> -	shift = __ffs(mask);
>   
>   	orig = rtw89_read16(rtwdev, addr);
> -	set = (orig & ~mask) | ((data << shift) & mask);
> +	set = (orig & ~mask) | field_prep(mask, data);
>   	rtw89_write16(rtwdev, addr, set);
>   }
>   
>   static inline void
>   rtw89_write8_mask(struct rtw89_dev *rtwdev, u32 addr, u32 mask, u8 data)
>   {
> -	u32 shift;
>   	u8 orig, set;
>   
>   	mask &= 0xff;
> -	shift = __ffs(mask);
>   
>   	orig = rtw89_read8(rtwdev, addr);
> -	set = (orig & ~mask) | ((data << shift) & mask);
> +	set = (orig & ~mask) | field_prep(mask, data);
>   	rtw89_write8(rtwdev, addr, set);
>   }
>   
>