linux-kernel - Re: [PATCH net-next v5 2/4] net: dsa: felix: (re)use already existing constants

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Date:   Wed, 8 Jul 2020 13:47:56 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Michael Walle <michael@...le.cc>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Alex Marginean <alexandru.marginean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Heiko Thiery <heiko.thiery@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH net-next v5 2/4] net: dsa: felix: (re)use already
 existing constants

On Tue, Jul 07, 2020 at 11:21:29PM +0200, Michael Walle wrote:
> Now that there are USXGMII constants available, drop the old definitions
> and reuse the generic ones.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
>  drivers/net/dsa/ocelot/felix_vsc9959.c | 45 +++++++-------------------
>  1 file changed, 12 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
> index 19614537b1ba..4310b1527022 100644
> --- a/drivers/net/dsa/ocelot/felix_vsc9959.c
> +++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
> @@ -10,35 +10,15 @@
>  #include <soc/mscc/ocelot.h>
>  #include <net/pkt_sched.h>
>  #include <linux/iopoll.h>
> +#include <linux/mdio.h>
>  #include <linux/pci.h>
>  #include "felix.h"
>  
>  #define VSC9959_VCAP_IS2_CNT		1024
>  #define VSC9959_VCAP_IS2_ENTRY_WIDTH	376
>  #define VSC9959_VCAP_PORT_CNT		6
> -
> -/* TODO: should find a better place for these */
> -#define USXGMII_BMCR_RESET		BIT(15)
> -#define USXGMII_BMCR_AN_EN		BIT(12)
> -#define USXGMII_BMCR_RST_AN		BIT(9)
> -#define USXGMII_BMSR_LNKS(status)	(((status) & GENMASK(2, 2)) >> 2)
> -#define USXGMII_BMSR_AN_CMPL(status)	(((status) & GENMASK(5, 5)) >> 5)
> -#define USXGMII_ADVERTISE_LNKS(x)	(((x) << 15) & BIT(15))
> -#define USXGMII_ADVERTISE_FDX		BIT(12)
> -#define USXGMII_ADVERTISE_SPEED(x)	(((x) << 9) & GENMASK(11, 9))
> -#define USXGMII_LPA_LNKS(lpa)		((lpa) >> 15)
> -#define USXGMII_LPA_DUPLEX(lpa)		(((lpa) & GENMASK(12, 12)) >> 12)
> -#define USXGMII_LPA_SPEED(lpa)		(((lpa) & GENMASK(11, 9)) >> 9)
> -
>  #define VSC9959_TAS_GCL_ENTRY_MAX	63
>  
> -enum usxgmii_speed {
> -	USXGMII_SPEED_10	= 0,
> -	USXGMII_SPEED_100	= 1,
> -	USXGMII_SPEED_1000	= 2,
> -	USXGMII_SPEED_2500	= 4,
> -};
> -
>  static const u32 vsc9959_ana_regmap[] = {
>  	REG(ANA_ADVLEARN,			0x0089a0),
>  	REG(ANA_VLANMASK,			0x0089a4),
> @@ -787,11 +767,10 @@ static void vsc9959_pcs_config_usxgmii(struct phy_device *pcs,
>  {
>  	/* Configure device ability for the USXGMII Replicator */
>  	phy_write_mmd(pcs, MDIO_MMD_VEND2, MII_ADVERTISE,
> -		      USXGMII_ADVERTISE_SPEED(USXGMII_SPEED_2500) |
> -		      USXGMII_ADVERTISE_LNKS(1) |
> +		      MDIO_LPA_USXGMII_2500FULL |
> +		      MDIO_LPA_USXGMII_LINK |
>  		      ADVERTISE_SGMII |
> -		      ADVERTISE_LPACK |
> -		      USXGMII_ADVERTISE_FDX);
> +		      ADVERTISE_LPACK);
>  }
>  
>  static void vsc9959_pcs_config(struct ocelot *ocelot, int port,
> @@ -1005,8 +984,8 @@ static void vsc9959_pcs_link_state_usxgmii(struct phy_device *pcs,
>  		return;
>  
>  	pcs->autoneg = true;
> -	pcs->autoneg_complete = USXGMII_BMSR_AN_CMPL(status);
> -	pcs->link = USXGMII_BMSR_LNKS(status);
> +	pcs->autoneg_complete = status & BMSR_ANEGCOMPLETE;
> +	pcs->link = status & BMSR_LSTATUS;

These are "unsigned :1" in struct phy_device, and not booleans. I'm not
sure how the compiler is going to treat this assignment of an integer.
I have a feeling it may not do the right thing. Could you please do
this?

	pcs->autoneg_complete = !!(status & BMSR_ANEGCOMPLETE);
	pcs->link = !!(status & BMSR_LSTATUS);

>  
>  	if (!pcs->link || !pcs->autoneg_complete)
>  		return;
> @@ -1015,24 +994,24 @@ static void vsc9959_pcs_link_state_usxgmii(struct phy_device *pcs,
>  	if (lpa < 0)
>  		return;
>  
> -	switch (USXGMII_LPA_SPEED(lpa)) {
> -	case USXGMII_SPEED_10:
> +	switch (lpa & MDIO_LPA_USXGMII_SPD_MASK) {
> +	case MDIO_LPA_USXGMII_10:
>  		pcs->speed = SPEED_10;
>  		break;
> -	case USXGMII_SPEED_100:
> +	case MDIO_LPA_USXGMII_100:
>  		pcs->speed = SPEED_100;
>  		break;
> -	case USXGMII_SPEED_1000:
> +	case MDIO_LPA_USXGMII_1000:
>  		pcs->speed = SPEED_1000;
>  		break;
> -	case USXGMII_SPEED_2500:
> +	case MDIO_LPA_USXGMII_2500:
>  		pcs->speed = SPEED_2500;
>  		break;
>  	default:
>  		break;
>  	}
>  
> -	if (USXGMII_LPA_DUPLEX(lpa))
> +	if (lpa & MDIO_LPA_USXGMII_FULL_DUPLEX)
>  		pcs->duplex = DUPLEX_FULL;
>  	else
>  		pcs->duplex = DUPLEX_HALF;
> -- 
> 2.20.1
> 

Thanks,
-Vladimir