mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-26 00:41:17 +00:00
42 lines
1.6 KiB
Diff
42 lines
1.6 KiB
Diff
|
From 2a2ccfa44e56c45dfd1230f6efb3ec0a4a677f0a Mon Sep 17 00:00:00 2001
|
||
|
|
From: Alex Marginean <alexandru.marginean@nxp.com>
|
||
|
|
Date: Wed, 15 Jan 2020 15:49:11 +0200
|
||
|
|
Subject: [PATCH] drivers: net: dsa: felix: don't restart PCS SGMII AN if not
|
||
|
|
needed
|
||
|
|
|
||
|
|
Some PHYs like VSC8234 don't like it when AN restarts on their system side
|
||
|
|
and they restart line side AN too, going into an endless link up/down loop.
|
||
|
|
Don't restart PCS AN if link is up already.
|
||
|
|
|
||
|
|
Suggested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
|
||
|
|
Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
|
||
|
|
---
|
||
|
|
drivers/net/dsa/ocelot/felix_vsc9959.c | 15 +++++++++++++++
|
||
|
|
1 file changed, 15 insertions(+)
|
||
|
|
|
||
|
|
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
|
||
|
|
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
|
||
|
|
@@ -648,7 +648,22 @@ static void vsc9959_pcs_init_sgmii(struc
|
||
|
|
unsigned int link_an_mode,
|
||
|
|
const struct phylink_link_state *state)
|
||
|
|
{
|
||
|
|
+ int bmsr, bmcr;
|
||
|
|
+
|
||
|
|
if (link_an_mode == MLO_AN_INBAND) {
|
||
|
|
+ /* Some PHYs like VSC8234 don't like it when AN restarts on
|
||
|
|
+ * their system side and they restart line side AN too, going
|
||
|
|
+ * into an endless link up/down loop. Don't restart PCS AN if
|
||
|
|
+ * link is up already.
|
||
|
|
+ * We do check that AN is enabled just in case this is the 1st
|
||
|
|
+ * call, PCS detects a carrier but AN is disabled from power on
|
||
|
|
+ * or by boot loader.
|
||
|
|
+ */
|
||
|
|
+ bmcr = phy_read(pcs, MII_BMCR);
|
||
|
|
+ bmsr = phy_read(pcs, MII_BMSR);
|
||
|
|
+ if ((bmcr & BMCR_ANENABLE) && (bmsr & BMSR_LSTATUS))
|
||
|
|
+ return;
|
||
|
|
+
|
||
|
|
/* SGMII spec requires tx_config_Reg[15:0] to be exactly 0x4001
|
||
|
|
* for the MAC PCS in order to acknowledge the AN.
|
||
|
|
*/
|