Subject: Re: [PATCH v2] net: ethernet: sun4i-emac: replace magic number with macro

From: Andrew Lunn <[email-masked]>
Date: Mon, 10 Jan 2022 14:31:28 +0100

> @@ -637,7 +637,9 @@ static void emac_rx(struct net_device *dev)
>  		if (!rxcount) {
>  			db->emacrx_completed_flag = 1;
>  			reg_val = readl(db->membase + EMAC_INT_CTL_REG);
> -			reg_val |= (0xf << 0) | (0x01 << 8);
> +			reg_val |=
> +				(EMAC_INT_CTL_TX_EN | EMAC_INT_CTL_TX_ABRT_EN |
> +				 EMAC_INT_CTL_RX_EN);

Putting the first value on the next line is a bit odd. This would be
preferred:

+			reg_val |= (EMAC_INT_CTL_TX_EN |
+                                   EMAC_INT_CTL_TX_ABRT_EN |
+				    EMAC_INT_CTL_RX_EN);

I also have to wonder why two | have become three? (0x01 << 8) is
clearly a single value. (0xf << 0) should either be a single macro, or
4 macros since 0xf is four bits. Without looking into the details, i
cannot say this is wrong, but it does look strange.

       Andrew