linux-kernel - RE: [PATCH 2/6] net: macb: add support for sgmii MAC-PHY interface

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Message-ID: <CO2PR07MB2469F4019870B9F7B49F46C9C1EA0@CO2PR07MB2469.namprd07.prod.outlook.com>
Date:   Tue, 18 Jun 2019 08:37:05 +0000
From:   Parshuram Raju Thombare <pthombar@...ence.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rafal Ciepiela <rafalc@...ence.com>,
        Anil Joy Varughese <aniljoy@...ence.com>,
        Piotr Sroka <piotrs@...ence.com>
Subject: RE: [PATCH 2/6] net: macb: add support for sgmii MAC-PHY interface

>> @@ -159,6 +160,9 @@
>>  #define GEM_PEFTN		0x01f4 /* PTP Peer Event Frame Tx Ns */
>>  #define GEM_PEFRSL		0x01f8 /* PTP Peer Event Frame Rx Sec Low */
>>  #define GEM_PEFRN		0x01fc /* PTP Peer Event Frame Rx Ns */
>> +#define GEM_PCS_CTRL		0x0200 /* PCS Control */
>> +#define GEM_PCS_STATUS          0x0204 /* PCS Status */
>> +#define GEM_PCS_AN_LP_BASE      0x0214 /* PCS AN LP BASE*/
>
>It looks like there are some space vs tab issues here and else where.
Ok, I will fix space vs tab issue.
>
>>  static int gem_phylink_mac_link_state(struct phylink_config *pl_config,
>>  				      struct phylink_link_state *state)  {
>> +	u32 status;
>>  	struct net_device *netdev = to_net_dev(pl_config->dev);
>>  	struct macb *bp = netdev_priv(netdev);
>
>Reverse christmas tree please, here and everywhere you add new variables.
>
Yes, sure. I will make take change.
>>
>> -	state->speed = bp->speed;
>> -	state->duplex = bp->duplex;
>> -	state->link = bp->link;
>> +	if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) {
>> +		status = gem_readl(bp, PCS_STATUS);
>> +		state->an_complete = GEM_BFEXT(PCS_STATUS_AN_DONE,
>status);
>> +		status = gem_readl(bp, PCS_AN_LP_BASE);
>> +		switch (GEM_BFEXT(PCS_AN_LP_BASE_SPEED, status)) {
>> +		case 0:
>> +			state->speed = 10;
>> +			break;
>> +		case 1:
>> +			state->speed = 100;
>> +			break;
>> +		case 2:
>> +			state->speed = 1000;
>> +			break;
>> +		default:
>> +			break;
>
>It would be nice to use SPEED_10, SPEED_100, etc.
>
Yes, sure. I will make take change.
>> @@ -494,17 +551,23 @@ static void gem_mac_config(struct phylink_config
>*pl_config, unsigned int mode,
>>  		reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
>>  		if (macb_is_gem(bp))
>>  			reg &= ~GEM_BIT(GBE);
>> -
>>  		if (state->duplex)
>>  			reg |= MACB_BIT(FD);
>> -		if (state->speed == SPEED_100)
>> -			reg |= MACB_BIT(SPD);
>> -		if (state->speed == SPEED_1000 &&
>> -		    bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
>> -			reg |= GEM_BIT(GBE);
>> -
>>  		macb_or_gem_writel(bp, NCFGR, reg);
>>
>> +		if (state->speed == SPEED_2500) {
>> +			gem_writel(bp, NCFGR, GEM_BIT(GBE) |
>> +				   gem_readl(bp, NCFGR));
>> +			gem_writel(bp, NCR, GEM_BIT(TWO_PT_FIVE_GIG) |
>> +				   gem_readl(bp, NCR));
>> +		} else if (state->speed == SPEED_1000) {
>> +			gem_writel(bp, NCFGR, GEM_BIT(GBE) |
>> +				   gem_readl(bp, NCFGR));
>> +		} else if (state->speed == SPEED_100) {
>> +			macb_writel(bp, NCFGR, MACB_BIT(SPD) |
>> +				    macb_readl(bp, NCFGR));
>> +		}
>
>Maybe a switch statement?
>
This suggested to be part of helper function in other patch.
I will add switch in helper inline function replacement of this code.

>> @@ -4232,11 +4327,37 @@ static int macb_probe(struct platform_device
>*pdev)
>>  	}
>>
>>  	err = of_get_phy_mode(np);
>
>The following code would be more readable if you replaced err with phy_mode,
>or interface.
>
Ok, sure.
>> -	if (err < 0)
>> +	if (err < 0) {
>>  		/* not found in DT, MII by default */
>>  		bp->phy_interface = PHY_INTERFACE_MODE_MII;
>> -	else
>> +	} else if (bp->caps & MACB_CAPS_MACB_IS_GEM_GXL) {
>> +		u32 interface_supported = 1;
>> +
>> +		if (err == PHY_INTERFACE_MODE_SGMII ||
>> +		    err == PHY_INTERFACE_MODE_1000BASEX ||
>> +		    err == PHY_INTERFACE_MODE_2500BASEX) {
>> +			if (!(bp->caps & MACB_CAPS_PCS))
>> +				interface_supported = 0;
>> +		} else if (err == PHY_INTERFACE_MODE_GMII ||
>> +			   err == PHY_INTERFACE_MODE_RGMII) {
>> +			if (!macb_is_gem(bp))
>> +				interface_supported = 0;
>> +		} else if (err != PHY_INTERFACE_MODE_RMII &&
>> +			   err != PHY_INTERFACE_MODE_MII) {
>> +			/* Add new mode before this */
>> +			interface_supported = 0;
>> +		}
>> +
>> +		if (!interface_supported) {
>> +			netdev_err(dev, "Phy mode %s not supported",
>> +				   phy_modes(err));
>> +			goto err_out_free_netdev;
>> +		}
>> +
>>  		bp->phy_interface = err;
>> +	} else {
>> +		bp->phy_interface = err;
>> +	}
>
>  Andrew

Regards,
Parshuram Thombare