Re: [net PATCH 1/2] net: dsa: qca8k: fix internal delay applied to the wrong PAD config

From: Vladimir Oltean
Date: Sun Nov 21 2021 - 13:18:35 EST


On Fri, Nov 19, 2021 at 03:03:49AM +0100, Ansuel Smith wrote:
> With SGMII phy the internal delay is always applied to the PAD0 config.
> This is caused by the falling edge configuration that hardcode the reg
> to PAD0 (as the falling edge bits are present only in PAD0 reg)
> Move the delay configuration before the reg overwrite to correctly apply
> the delay.
>
> Fixes: cef08115846e ("net: dsa: qca8k: set internal delay also for sgmii")
> Signed-off-by: Ansuel Smith <ansuelsmth@xxxxxxxxx>
> ---

This removes the need for your other patch "net: dsa: qca8k: skip sgmii
delay on double cpu conf", right?

> drivers/net/dsa/qca8k.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
> index a429c9750add..d7bcecbc1c53 100644
> --- a/drivers/net/dsa/qca8k.c
> +++ b/drivers/net/dsa/qca8k.c
> @@ -1433,6 +1433,12 @@ qca8k_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
>
> qca8k_write(priv, QCA8K_REG_SGMII_CTRL, val);
>
> + /* From original code is reported port instability as SGMII also
> + * require delay set. Apply advised values here or take them from DT.
> + */
> + if (state->interface == PHY_INTERFACE_MODE_SGMII)
> + qca8k_mac_config_setup_internal_delay(priv, cpu_port_index, reg);
> +
> /* For qca8327/qca8328/qca8334/qca8338 sgmii is unique and
> * falling edge is set writing in the PORT0 PAD reg
> */
> @@ -1455,12 +1461,6 @@ qca8k_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
> QCA8K_PORT0_PAD_SGMII_TXCLK_FALLING_EDGE,
> val);
>
> - /* From original code is reported port instability as SGMII also
> - * require delay set. Apply advised values here or take them from DT.
> - */
> - if (state->interface == PHY_INTERFACE_MODE_SGMII)
> - qca8k_mac_config_setup_internal_delay(priv, cpu_port_index, reg);
> -
> break;
> default:
> dev_err(ds->dev, "xMII mode %s not supported for port %d\n",
> --
> 2.32.0
>