kernel: backport generic phylink validate

Backport generic phylink validate series and make use of it for
mtk_eth_soc Ethernet driver as well as mt7530 DSA driver.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.15/704-10-v5.19-net-mtk_eth_soc-correct-802.3z-speed-setting.patch b/target/linux/generic/backport-5.15/704-10-v5.19-net-mtk_eth_soc-correct-802.3z-speed-setting.patch
new file mode 100644
index 0000000000..fb1ee4e310
--- /dev/null
+++ b/target/linux/generic/backport-5.15/704-10-v5.19-net-mtk_eth_soc-correct-802.3z-speed-setting.patch
@@ -0,0 +1,60 @@
+From 7da3f901f8ecb425105fad39a0f5de73306abe52 Mon Sep 17 00:00:00 2001
+From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
+Date: Wed, 18 May 2022 15:54:47 +0100
+Subject: [PATCH 04/12] net: mtk_eth_soc: correct 802.3z speed setting
+
+Phylink does not guarantee that state->speed will be set correctly in
+the mac_config() call, so it's a bug that the driver makes use of it.
+Moreover, it is making use of it in a function that is only ever called
+for 1000BASE-X and 2500BASE-X which operate at a fixed speed which
+happens to be the same setting irrespective of the interface mode. We
+can simply remove the switch statement and just set the SGMII interface
+speed.
+
+Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
+Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+---
+ drivers/net/ethernet/mediatek/mtk_sgmii.c | 18 +++++-------------
+ 1 file changed, 5 insertions(+), 13 deletions(-)
+
+--- a/drivers/net/ethernet/mediatek/mtk_sgmii.c
++++ b/drivers/net/ethernet/mediatek/mtk_sgmii.c
+@@ -34,6 +34,7 @@ int mtk_sgmii_init(struct mtk_sgmii *ss,
+ 	return 0;
+ }
+ 
++/* For SGMII interface mode */
+ int mtk_sgmii_setup_mode_an(struct mtk_sgmii *ss, int id)
+ {
+ 	unsigned int val;
+@@ -60,6 +61,9 @@ int mtk_sgmii_setup_mode_an(struct mtk_s
+ 	return 0;
+ }
+ 
++/* For 1000BASE-X and 2500BASE-X interface modes, which operate at a
++ * fixed speed.
++ */
+ int mtk_sgmii_setup_mode_force(struct mtk_sgmii *ss, int id,
+ 			       const struct phylink_link_state *state)
+ {
+@@ -82,19 +86,7 @@ int mtk_sgmii_setup_mode_force(struct mt
+ 	/* SGMII force mode setting */
+ 	regmap_read(ss->regmap[id], SGMSYS_SGMII_MODE, &val);
+ 	val &= ~SGMII_IF_MODE_MASK;
+-
+-	switch (state->speed) {
+-	case SPEED_10:
+-		val |= SGMII_SPEED_10;
+-		break;
+-	case SPEED_100:
+-		val |= SGMII_SPEED_100;
+-		break;
+-	case SPEED_2500:
+-	case SPEED_1000:
+-		val |= SGMII_SPEED_1000;
+-		break;
+-	}
++	val |= SGMII_SPEED_1000;
+ 
+ 	if (state->duplex == DUPLEX_FULL)
+ 		val |= SGMII_DUPLEX_FULL;