This is a note to let you know that I've just added the patch titled
net: dsa: lantiq_gswip: Let GSWIP automatically set the xMII clock
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-dsa-lantiq_gswip-let-gswip-automatically-set-the-xmii-clock.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3e6fdeb28f4c331acbd27bdb0effc4befd4ef8e8 Mon Sep 17 00:00:00 2001
From: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Date: Wed, 24 Mar 2021 20:36:04 +0100
Subject: net: dsa: lantiq_gswip: Let GSWIP automatically set the xMII clock
From: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
commit 3e6fdeb28f4c331acbd27bdb0effc4befd4ef8e8 upstream.
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@xxxxxxxxxxxxxx>
Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/dsa/lantiq_gswip.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -795,10 +795,15 @@ static int gswip_setup(struct dsa_switch
/* 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));
Patches currently in stable-queue which might be from martin.blumenstingl@xxxxxxxxxxxxxx are
queue-5.4/net-dsa-lantiq_gswip-configure-all-remaining-gswip_mii_cfg-bits.patch
queue-5.4/net-dsa-lantiq_gswip-let-gswip-automatically-set-the-xmii-clock.patch
queue-5.4/net-dsa-lantiq_gswip-don-t-use-phy-auto-polling.patch
