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Daniel Golle
18cbd83a14
Import pending series introducing support for standalone PCS drivers. This has previously already been used by the airoha target, and is also the base for the closer-to-upstream patches for MediaTek MT7988 10G SerDes support. In order to not having to diverge from upstream also backport series for standardized handling for PHY and PCS SerDes pair polarity. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
38 lines
1.3 KiB
Diff
38 lines
1.3 KiB
Diff
From 7289d42b8fd17713531c0f7e8ae7653d1f2c6f8f Mon Sep 17 00:00:00 2001
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From: Frank Wunderlich <frank-w@public-files.de>
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Date: Thu, 9 Apr 2026 15:33:42 +0200
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Subject: [PATCH] net: pcs: pcs-mtk-lynxi: fix bpi-r3 serdes configuration
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Commit 8871389da151 introduces common pcs dts properties which writes
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rx=normal,tx=normal polarity to register SGMSYS_QPHY_WRAP_CTRL of switch.
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This is initialized with tx-bit set and so change inverts polarity
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compared to before.
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It looks like mt7531 has tx polarity inverted in hardware and set tx-bit
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by default to restore the normal polarity.
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Till this patch the register write was only called when mediatek,pnswap
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property was set which cannot be done for switch because the fw-node param
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was always NULL from switch driver in the mtk_pcs_lynxi_create call.
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Do not configure switch side like it's done before.
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Fixes: 8871389da151 ("net: pcs: pcs-mtk-lynxi: deprecate "mediatek,pnswap"")
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Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
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---
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drivers/net/pcs/pcs-mtk-lynxi.c | 3 +++
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1 file changed, 3 insertions(+)
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--- a/drivers/net/pcs/pcs-mtk-lynxi.c
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+++ b/drivers/net/pcs/pcs-mtk-lynxi.c
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@@ -129,6 +129,9 @@ static int mtk_pcs_config_polarity(struc
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unsigned int val = 0;
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int ret;
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+ if (!fwnode)
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+ return 0;
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+
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if (fwnode_property_read_bool(fwnode, "mediatek,pnswap"))
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default_pol = PHY_POL_INVERT;
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