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