linux-kernel - Re: [PATCH V2 net-next 6/8] net: hns3: Add MDIO support to HNS3 Ethernet driver for hip08 SoC

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Date:   Wed, 14 Jun 2017 04:42:34 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Salil Mehta <salil.mehta@...wei.com>
Cc:     davem@...emloft.net, yisen.zhuang@...wei.com,
        huangdaode@...ilicon.com, lipeng321@...wei.com,
        mehta.salil.lnk@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com
Subject: Re: [PATCH V2 net-next 6/8] net: hns3: Add MDIO support to HNS3
 Ethernet driver for hip08 SoC

> +struct hclge_mdio_cfg_cmd {
> +	u8 ctrl_bit;
> +	u8 prtad;       /* The external port address */
> +	u8 devad;       /* The external device address */
> +	u8 rsvd;
> +	__le16 addr_c45;/* Only valid for c45 */
> +	__le16 data_wr;
> +	__le16 data_rd;
> +	__le16 sta;
> +};
> +
> +static int hclge_mdio_write(struct mii_bus *bus, int phy_id, int regnum,
> +			    u16 data)
> +{
> +	struct hclge_dev *hdev = (struct hclge_dev *)bus->priv;
> +	struct hclge_mdio_cfg_cmd *mdio_cmd;
> +	enum hclge_cmd_status status;
> +	struct hclge_desc desc;
> +	u8 is_c45, devad;
> +	u16 reg;
> +
> +	if (!bus)
> +		return -EINVAL;
> +
> +	is_c45 = !!(regnum & MII_ADDR_C45);
> +	devad = ((regnum >> 16) & 0x1f);
> +	reg = (u16)(regnum & 0xffff);
> +
> +	hclge_cmd_setup_basic_desc(&desc, HCLGE_OPC_MDIO_CONFIG, false);
> +
> +	mdio_cmd = (struct hclge_mdio_cfg_cmd *)desc.data;
> +
> +	mdio_cmd->ctrl_bit |= HCLGE_MDIO_CTRL_START_BIT;
> +	mdio_cmd->prtad = phy_id & HCLGE_MDIO_CTRL_PRTAD_MSK;
> +	mdio_cmd->data_wr = cpu_to_le16(data);
> +	mdio_cmd->devad = devad & HCLGE_MDIO_CTRL_DEVAD_MSK;
> +
> +	if (is_c45) {
> +		/* Set phy addr */
> +		mdio_cmd->addr_c45 = cpu_to_le16(reg);
> +	} else {
> +		/* C22 write reg and data */
> +		mdio_cmd->ctrl_bit = HCLGE_MDIO_IS_C22(!is_c45);
> +		mdio_cmd->ctrl_bit |= HCLGE_MDIO_CTRL_OP(HCLGE_MDIO_C22_WRITE);
> +	}

When doing C22, i don't see you putting the reg into mdio_cmd anywhere?

Also

	mdio_cmd->ctrl_bit = HCLGE_MDIO_IS_C22(!is_c45);

can be pulled of the if/then/else since it takes is_c45 as a
parameter, or simplified.

     Andrew