linux-kernel - Re: [PATCH] phy: allwinner: Fix GENMASK misuse

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Date:   Fri, 8 Nov 2019 12:41:38 +0100
From:   Ondřej Jirman <megous@...ous.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Rikard Falkeborn <rikard.falkeborn@...il.com>, arnd@...db.de,
        devicetree@...r.kernel.org, gregkh@...uxfoundation.org,
        kishon@...com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        mark.rutland@....com, mripard@...nel.org,
        paul.kocialkowski@...tlin.com, robh+dt@...nel.org,
        tglx@...utronix.de, wens@...e.org
Subject: Re: [PATCH] phy: allwinner: Fix GENMASK misuse

On Fri, Nov 08, 2019 at 07:29:21PM +0800, Icenowy Zheng wrote:
> 
> 
> 于 2019年11月8日 GMT+08:00 上午5:45:14, "Ondřej Jirman" <megous@...ous.com> 写到:
> >Hello Rikard,
> >
> >On Thu, Nov 07, 2019 at 09:46:45PM +0100, Rikard Falkeborn wrote:
> >> Arguments are supposed to be ordered high then low.
> >> 
> >> Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>
> >> ---
> >> Spotted while trying to add compile time checks of GENMASK arguments.
> >> Patch has only been compile tested.
> >
> >thank you!
> >
> >Tested-by: Ondrej Jirman <megous@...ous.com>
> 
> Does it affect or fix the performance?

See here: https://forum.armbian.com/topic/10131-orange-pi-lite2-usb3-now-working/?do=findComment&comment=88904

Quote:

> It may or may not help. On Opi3 I see no change, probably because HUB is
> really close to the SoC, but on boards without a HUB, SoC's USB3 phy will
> have to drive the signal over the longer cable and this patch might benefit
> those boards. 

Maybe someone with boards without PHY will test it more.

regards,
	o.

> >
> >regards,
> >	o.
> >
> >>  drivers/phy/allwinner/phy-sun50i-usb3.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >> 
> >> diff --git a/drivers/phy/allwinner/phy-sun50i-usb3.c
> >b/drivers/phy/allwinner/phy-sun50i-usb3.c
> >> index 1169f3e83a6f..b1c04f71a31d 100644
> >> --- a/drivers/phy/allwinner/phy-sun50i-usb3.c
> >> +++ b/drivers/phy/allwinner/phy-sun50i-usb3.c
> >> @@ -49,7 +49,7 @@
> >>  #define SUNXI_LOS_BIAS(n)		((n) << 3)
> >>  #define SUNXI_LOS_BIAS_MASK		GENMASK(5, 3)
> >>  #define SUNXI_TXVBOOSTLVL(n)		((n) << 0)
> >> -#define SUNXI_TXVBOOSTLVL_MASK		GENMASK(0, 2)
> >> +#define SUNXI_TXVBOOSTLVL_MASK		GENMASK(2, 0)
> >>  
> >>  struct sun50i_usb3_phy {
> >>  	struct phy *phy;
> >> -- 
> >> 2.24.0
> >>