On Mon, Feb 18, 2019 at 06:33:51PM +0530, Vinod Koul wrote:
> RGMII_ID specifies that we should have internal delay, so resurrect the
> delay addition routine but under the RGMII_ID mode.
>
> Fixes: 40269aa9f40a ("net: dsa: qca8k: disable delay for RGMII mode")
> Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
> ---
> drivers/net/dsa/qca8k.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
> index a4b6cda38016..aa1f7f1b20d3 100644
> --- a/drivers/net/dsa/qca8k.c
> +++ b/drivers/net/dsa/qca8k.c
> @@ -443,6 +443,18 @@ qca8k_set_pad_ctrl(struct qca8k_priv *priv, int port, int mode)
> val = QCA8K_PORT_PAD_RGMII_EN;
> qca8k_write(priv, reg, val);
> break;
> + case PHY_INTERFACE_MODE_RGMII_ID:
> + /* RGMII_ID needs internal delay. This is enabled through
> + * PORT5_PAD_CTRL for all ports, rather than individual port
> + * registers
> + */
> + qca8k_write(priv, reg,
> + QCA8K_PORT_PAD_RGMII_EN |
> + QCA8K_PORT_PAD_RGMII_TX_DELAY(3) |
> + QCA8K_PORT_PAD_RGMII_RX_DELAY(3));
> + qca8k_write(priv, QCA8K_REG_PORT5_PAD_CTRL,
> + QCA8K_PORT_PAD_RGMII_RX_DELAY_EN);
> + break;
Hi Vinod
So i'm still confused if this is global, or per-port. The first
register written looks to be per-port, although only for ports 0 and
6. The second write seems to be global.
Is there a danger that port 0 has PHY_INTERFACE_MODE_RGMII_ID and port
6 has PHY_INTERFACE_MODE_RGMII, and we end up with delays disabled?
Maybe we should try to detect this, and return an error?
> case PHY_INTERFACE_MODE_SGMII:
> qca8k_write(priv, reg, QCA8K_PORT_PAD_SGMII_EN);
> break;
I think it would be good to add the other two PHY_INTERFACE_MODE_RGMII
modes to the default clause so we get an error reported that they are
not implemented.
Andrew
