From cdd8b8a433c9c3c540d41591374fb0cbdc115878 Mon Sep 17 00:00:00 2001
From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Date: Wed, 24 Mar 2021 20:36:04 +0100
Subject: [PATCH 10/17] net: dsa: lantiq_gswip: Let GSWIP automatically set the
xMII clock
Git-commit: 3e6fdeb28f4c331acbd27bdb0effc4befd4ef8e8
References: git-fixes
Patch-mainline: v5.12-rc7
The xMII interface clock depends on the PHY interface (MII, RMII, RGMII)
as well as the current link speed. Explicitly configure the GSWIP to
automatically select the appropriate xMII interface clock.
This fixes an issue seen by some users where ports using an external
RMII or RGMII PHY were deaf (no RX or TX traffic could be seen). Most
likely this is due to an "invalid" xMII clock being selected either by
the bootloader or hardware-defaults.
Fixes: 14fceff4771e51 ("net: dsa: Add Lantiq / Intel DSA driver for vrx200")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
drivers/net/dsa/lantiq_gswip.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index 69884a719b87..7bb7f3f4b880 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -789,10 +789,15 @@ static int gswip_setup(struct dsa_switch *ds)
/* Configure the MDIO Clock 2.5 MHz */
gswip_mdio_mask(priv, 0xff, 0x09, GSWIP_MDIO_MDC_CFG1);
- /* Disable the xMII link */
- for (i = 0; i < priv->hw_info->max_ports; i++)
+ for (i = 0; i < priv->hw_info->max_ports; i++) {
+ /* Disable the xMII link */
gswip_mii_mask_cfg(priv, GSWIP_MII_CFG_EN, 0, i);
+ /* Automatically select the xMII interface clock */
+ gswip_mii_mask_cfg(priv, GSWIP_MII_CFG_RATE_MASK,
+ GSWIP_MII_CFG_RATE_AUTO, i);
+ }
+
/* enable special tag insertion on cpu port */
gswip_switch_mask(priv, 0, GSWIP_FDMA_PCTRL_STEN,
GSWIP_FDMA_PCTRLp(cpu_port));
--
2.16.4