linux-kernel - Re: [PATCH net-next 4/7] net: phy: bcm84881: use phy_read_mmd_poll

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Date:   Thu, 19 Mar 2020 18:23:12 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Dejin Zheng <zhengdejin5@...il.com>
Cc:     f.fainelli@...il.com, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, tglx@...utronix.de, broonie@...nel.org,
        corbet@....net, mchehab+samsung@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 4/7] net: phy: bcm84881: use
 phy_read_mmd_poll_timeout() to simplify the code

On Fri, Mar 20, 2020 at 12:39:07AM +0800, Dejin Zheng wrote:
> use phy_read_mmd_poll_timeout() to replace the poll codes for
> simplify the code in bcm84881_wait_init() function.
> 
> Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
> ---
>  drivers/net/phy/bcm84881.c | 24 ++++++------------------
>  1 file changed, 6 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/net/phy/bcm84881.c b/drivers/net/phy/bcm84881.c
> index 14d55a77eb28..c916bd0f6afa 100644
> --- a/drivers/net/phy/bcm84881.c
> +++ b/drivers/net/phy/bcm84881.c
> @@ -22,26 +22,14 @@ enum {
>  
>  static int bcm84881_wait_init(struct phy_device *phydev)
>  {
> -	unsigned int tries = 20;
>  	int ret, val;
>  
> -	do {
> -		val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
> -		if (val < 0) {
> -			ret = val;
> -			break;
> -		}
> -		if (!(val & MDIO_CTRL1_RESET)) {
> -			ret = 0;
> -			break;
> -		}
> -		if (!--tries) {
> -			ret = -ETIMEDOUT;
> -			break;
> -		}
> -		msleep(100);
> -	} while (1);
> -
> +	ret = phy_read_mmd_poll_timeout(val, val < 0 ||
> +					!(val & MDIO_CTRL1_RESET), 100000,

It would be good if the "val < 0" was not here. What the user is
really interested in is !(val & MDIO_CTRL1_RESET). "val < 0" is the
error handling for phy_read_mmd(). This would look a lot nicer if that
error handling was inside phy_read_mmd_poll_timeout() and ret would
already contain the error from phy_read_mmd(). Not sure you can do
this and still make use of readx_poll_timeout().

     Andrew