驱动位置 lichee/linux-5.4/drivers/net/ethernet/allwinner/sunxi-gmac.c

原代码

static ssize_t mii_write_store(struct device *dev,
                struct device_attribute *attr, const char *buf, size_t count)
{
        struct net_device *ndev = NULL;
        struct geth_priv *priv = NULL;
        int ret = 0;
        u16 reg, addr, val;
        char *ptr;

        ptr = (char *)buf;

        if (dev == NULL) {
                pr_err("Argment is invalid\n");
                return count;
        }

        ndev = dev_get_drvdata(dev);
        if (ndev == NULL) {
                pr_err("Net device is null\n");
                return count;
        }

        priv = netdev_priv(ndev);
        if (priv == NULL) {
                pr_err("geth_priv is null\n");
                return count;
        }

        if (!netif_running(ndev)) {
                pr_warn("eth is down!\n");
                return count;
        }

        ret = sunxi_parse_write_str(ptr, &addr, &reg, &val);
        if (ret)
                return ret;

        priv->mii_reg.reg = reg;
        priv->mii_reg.addr = addr;
        priv->mii_reg.value = val;

        return count;
}

攸改过后

static ssize_t mii_write_store(struct device *dev,
                struct device_attribute *attr, const char *buf, size_t count)
{
        struct net_device *ndev = NULL;
        struct geth_priv *priv = NULL;
        int ret = 0;
        u16 reg, addr, val;
        char *ptr;

        ptr = (char *)buf;

        if (dev == NULL) {
                pr_err("Argment is invalid\n");
                return count;
        }

        ndev = dev_get_drvdata(dev);
        if (ndev == NULL) {
                pr_err("Net device is null\n");
                return count;
        }

        priv = netdev_priv(ndev);
        if (priv == NULL) {
                pr_err("geth_priv is null\n");
                return count;
        }

        if (!netif_running(ndev)) {
                pr_warn("eth is down!\n");
                return count;
        }

        ret = sunxi_parse_write_str(ptr, &addr, &reg, &val);
        if (ret)
                return ret;

        if((2 == reg) || (3 == reg))
        {
                u32 clk_value;
                u8 tdelay;
                u8 rdelay;

                clk_value = readl(priv->base_phy);

                tdelay = (clk_value >> 10) & 0x07;
                rdelay = (clk_value >> 5) & 0x1f;

                printk("gmac delay read  tx--> %x , rx--> %x \n", tdelay, rdelay);

                if(2 == reg)
                {
                        tdelay = (val & 0x07);
                }
                else
                {
                        rdelay = (val & 0x1f);
                }

                printk("gmac delay write tx--> %x , rx--> %x \n", tdelay, rdelay);

                clk_value &= ~((0x07 << 10)| (0x1F << 5));
                clk_value |= ((tdelay << 10) | (rdelay << 5));

                writel(clk_value, priv->base_phy);
        }

        priv->mii_reg.reg = reg;
        priv->mii_reg.addr = addr;
        priv->mii_reg.value = val;

        return count;
}

使用方式如下：

• 先使用 ifconfig eth0 192.168.1.100 ，啟动 gmac 驱动

• 使用下面命令，进行 tx_delay 修改，3 个参数 , 第一个随便设，第二个需设置 2 , 第三个為 tx_delay 设置值，范围 0x0 ~ 0x7

root@TinaLinux:/# echo 0 2 3 > /sys/devices/platform/soc@3000000/4500000.eth/mii_write
[   66.901376] gmac delay read  tx--> 2 , rx--> d 
[   66.911086] gmac delay write tx--> 3 , rx--> d 

root@TinaLinux:/# echo 0 2 5 > /sys/devices/platform/soc@3000000/4500000.eth/mii_write
[   92.944996] gmac delay read  tx--> 3 , rx--> d 
[   92.954582] gmac delay write tx--> 5 , rx--> d 

• 使用下面命令，进行 rx_delay 修改，3 个参数 , 第一个随便设，第二个需设置 3 , 第三个為 rx_delay 设置值，范围 0x0 ~ 0x1f , 输入需要使用 16 进位

root@TinaLinux:/# echo 0 3  a > /sys/devices/platform/soc@3000000/4500000.eth/mi_write 
[  108.317230] gmac delay read  tx--> 5 , rx--> d 
[  108.327034] gmac delay write tx--> 5 , rx--> a 

root@TinaLinux:/# echo 0 3  1c > /sys/devices/platform/soc@3000000/4500000.eth/mii_write
[  120.347615] gmac delay read  tx--> 5 , rx--> a 
[  120.357371] gmac delay write tx--> 5 , rx--> 1c

root@TinaLinux:/# echo 0 3  1c > /sys/devices/platform/soc@3000000/4500000.eth/mii_write
[  126.976849] gmac delay read  tx--> 5 , rx--> 1c 
[  126.986301] gmac delay write tx--> 5 , rx--> 1c 

• 测试时先使用外机 ping d1s ，调整 rx_delay 值后，使用 ifconfig 查看 rx_byte 及 crc 值，看是否有正常接收，并且无 crc 。 找出某一区间都正常，例如 4 ~ c 都是正常的！ 此时将 rx_delay 设置在 8 。

• rx_delay 设置后，在用 d1s ping 外机，调整 tx_delay 值，看在什么区间可以正常 ping 不丢包， 一样取中间值