Re: [PATCH net-next v3 3/3] net: dsa: rzn1-a5psw: add vlan support

Vladimir Oltean
2023-02-08T22:03:20Z

On Wed, Feb 08, 2023 at 05:17:49PM +0100, Clément Léger wrote:
> +static void a5psw_port_vlan_tagged_cfg(struct a5psw *a5psw, int vlan_res_id,
> + int port, bool set)
> +{
> + u32 mask = A5PSW_VLAN_RES_WR_PORTMASK | A5PSW_VLAN_RES_RD_TAGMASK |
> + BIT(port);
> + u32 vlan_res_off = A5PSW_VLAN_RES(vlan_res_id);
> + u32 val = A5PSW_VLAN_RES_WR_TAGMASK, reg;
> +
> + if (set)
> + val |= BIT(port);
> +
> + /* Toggle tag mask read */
> + a5psw_reg_writel(a5psw, vlan_res_off, A5PSW_VLAN_RES_RD_TAGMASK);
> + reg = a5psw_reg_readl(a5psw, vlan_res_off);
> + a5psw_reg_writel(a5psw, vlan_res_off, A5PSW_VLAN_RES_RD_TAGMASK);

Is it intentional that this register is written twice?

> +
> + reg &= ~mask;
> + reg |= val;
> + a5psw_reg_writel(a5psw, vlan_res_off, reg);
> +}