[U-Boot] [PATCH 16/26] net: mt7628-eth: remove phy link up detection

[Stefan Roese]

On 28.08.19 08:38, Weijie Gao wrote:
> The mt7628 has an embedded ethernet switch (5 phy ports + 1 cpu port).
> Although in IOT mode only port0 is usable, the phy0 is still connected
> to the switch, not the ethernet gmac directly.
> 
> This patch removes these codes as we should not check only the status of
> phy0 because phy0 may not be linked up in router mode which has all 5 phy
> ports working.

I understand. But for those embedded targets that use the mainline code
right now, this setup is exactly the one that's used. With this patch applied
this "feature" of link detection of the only ethernet port is removed.

Can't we somehow change this code, that it supports both operations modes?
So targets without switch functionality and targets with multiple ports
(with switch functionality) can be supported? Perhaps via some DT property
or at least a Kconfig option?

BTW: Do you plan to add support for a target with switch functionality? That
would be just great.

Thanks,
Stefan

> Signed-off-by: Weijie Gao <weijie.gao at mediatek.com>
> ---
>   drivers/net/mt7628-eth.c | 32 --------------------------------
>   1 file changed, 32 deletions(-)
> 
> diff --git a/drivers/net/mt7628-eth.c b/drivers/net/mt7628-eth.c
> index 4675b0f003..eef25da8a8 100644
> --- a/drivers/net/mt7628-eth.c
> +++ b/drivers/net/mt7628-eth.c
> @@ -120,9 +120,6 @@ struct fe_tx_dma {
>   #define CONFIG_DMA_STOP_TIMEOUT	100
>   #define CONFIG_TX_DMA_TIMEOUT	100
>   
> -#define LINK_DELAY_TIME		500		/* 500 ms */
> -#define LINK_TIMEOUT		10000		/* 10 seconds */
> -
>   struct mt7628_eth_dev {
>   	void __iomem *base;		/* frame engine base address */
>   	void __iomem *eth_sw_base;	/* switch base address */
> @@ -437,14 +434,6 @@ static int mt7628_eth_free_pkt(struct udevice *dev, uchar *packet, int length)
>   	return 0;
>   }
>   
> -static int phy_link_up(struct mt7628_eth_dev *priv)
> -{
> -	u32 val;
> -
> -	mii_mgr_read(priv, 0x00, MII_BMSR, &val);
> -	return !!(val & BMSR_LSTATUS);
> -}
> -
>   static int mt7628_eth_start(struct udevice *dev)
>   {
>   	struct mt7628_eth_dev *priv = dev_get_priv(dev);
> @@ -493,27 +482,6 @@ static int mt7628_eth_start(struct udevice *dev)
>   	wmb();
>   	eth_dma_start(priv);
>   
> -	/* Check if link is not up yet */
> -	if (!phy_link_up(priv)) {
> -		/* Wait for link to come up */
> -
> -		printf("Waiting for link to come up .");
> -		for (i = 0; i < (LINK_TIMEOUT / LINK_DELAY_TIME); i++) {
> -			mdelay(LINK_DELAY_TIME);
> -			if (phy_link_up(priv)) {
> -				mdelay(100);	/* Ensure all is ready */
> -				break;
> -			}
> -
> -			printf(".");
> -		}
> -
> -		if (phy_link_up(priv))
> -			printf(" done\n");
> -		else
> -			printf(" timeout! Trying anyways\n");
> -	}
> -
>   	/*
>   	 * The integrated switch seems to queue some received ethernet
>   	 * packets in some FIFO. Lets read the already queued packets
> 

Viele Grüße,
Stefan

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