kernel: mtk_eth_soc: release MAC_MCR_FORCE_LINK only when MAC is up

Clearing bit MAC_MCR_FORCE_LINK which forces the link down too early
can result in MAC ending up in a broken/blocked state.

Fix this by handling this bit in the .mac_link_up and .mac_link_down
calls instead of in .mac_finish.

Suggested-by: Mason-cw Chang <Mason-cw.Chang@mediatek.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>

2 files changed, 71 insertions, 20 deletions

diff --git a/target/linux/generic/pending-6.1/735-net-mediatek-mtk_eth_soc-release-MAC_MCR_FORCE_LINK-.patch b/target/linux/generic/pending-6.1/735-net-mediatek-mtk_eth_soc-release-MAC_MCR_FORCE_LINK-.patch
new file mode 100644
index 0000000000..2f7d29b84d
--- /dev/null
+++ b/target/linux/generic/pending-6.1/735-net-mediatek-mtk_eth_soc-release-MAC_MCR_FORCE_LINK-.patch
@@ -0,0 +1,50 @@
+From ef5976ae4e117fae9a61bb3c0f8319a917a425ea Mon Sep 17 00:00:00 2001
+From: Daniel Golle <daniel@makrotopia.org>
+Date: Mon, 11 Mar 2024 17:43:28 +0000
+Subject: [PATCH] net: mediatek: mtk_eth_soc: release MAC_MCR_FORCE_LINK only when MAC is up
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Clearing bit MAC_MCR_FORCE_LINK which forces the link down too early
+can result in MAC ending up in a broken/blocked state.
+
+Fix this by handling this bit in the .mac_link_up and .mac_link_down
+calls instead of in .mac_finish.
+
+Fixes: b8fc9f30821ec ("net: ethernet: mediatek: Add basic PHYLINK support")
+Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+---
+ drivers/net/ethernet/mediatek/mtk_eth_soc.c | 7 +++----
+ 1 file changed, 3 insertions(+), 4 deletions(-)
+
+--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
++++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+@@ -662,8 +662,7 @@ static int mtk_mac_finish(struct phylink
+ 	mcr_cur = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
+ 	mcr_new = mcr_cur;
+ 	mcr_new |= MAC_MCR_IPG_CFG | MAC_MCR_FORCE_MODE |
+-		   MAC_MCR_BACKOFF_EN | MAC_MCR_BACKPR_EN | MAC_MCR_FORCE_LINK |
+-		   MAC_MCR_RX_FIFO_CLR_DIS;
++		   MAC_MCR_BACKOFF_EN | MAC_MCR_BACKPR_EN | MAC_MCR_RX_FIFO_CLR_DIS;
+ 
+ 	/* Only update control register when needed! */
+ 	if (mcr_new != mcr_cur)
+@@ -679,7 +678,7 @@ static void mtk_mac_link_down(struct phy
+ 					   phylink_config);
+ 	u32 mcr = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
+ 
+-	mcr &= ~(MAC_MCR_TX_EN | MAC_MCR_RX_EN);
++	mcr &= ~(MAC_MCR_TX_EN | MAC_MCR_RX_EN | MAC_MCR_FORCE_LINK);
+ 	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
+ }
+ 
+@@ -788,7 +787,7 @@ static void mtk_mac_link_up(struct phyli
+ 	if (rx_pause)
+ 		mcr |= MAC_MCR_FORCE_RX_FC;
+ 
+-	mcr |= MAC_MCR_TX_EN | MAC_MCR_RX_EN;
++	mcr |= MAC_MCR_TX_EN | MAC_MCR_RX_EN | MAC_MCR_FORCE_LINK;
+ 	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
+ }
+ 
diff --git a/target/linux/generic/pending-6.1/737-net-ethernet-mtk_eth_soc-add-paths-and-SerDes-modes-.patch b/target/linux/generic/pending-6.1/737-net-ethernet-mtk_eth_soc-add-paths-and-SerDes-modes-.patch
index afe561ab31..2b379c9158 100644
--- a/target/linux/generic/pending-6.1/737-net-ethernet-mtk_eth_soc-add-paths-and-SerDes-modes-.patch
+++ b/target/linux/generic/pending-6.1/737-net-ethernet-mtk_eth_soc-add-paths-and-SerDes-modes-.patch
@@ -1,4 +1,4 @@
-From 91bda2f441f9e37273922028ffc48ce8e91bf5bd Mon Sep 17 00:00:00 2001
+From d5e337e7aecc2e1cc9e96768062610adb95f8f72 Mon Sep 17 00:00:00 2001
 From: Daniel Golle <daniel@makrotopia.org>
 Date: Tue, 12 Dec 2023 03:51:14 +0000
 Subject: [PATCH] net: ethernet: mtk_eth_soc: add paths and SerDes modes for
@@ -19,9 +19,9 @@ modes.
 Signed-off-by: Daniel Golle <daniel@makrotopia.org>
 ---
  drivers/net/ethernet/mediatek/mtk_eth_path.c | 122 +++++++-
- drivers/net/ethernet/mediatek/mtk_eth_soc.c  | 291 +++++++++++++++++--
+ drivers/net/ethernet/mediatek/mtk_eth_soc.c  | 292 +++++++++++++++++--
  drivers/net/ethernet/mediatek/mtk_eth_soc.h  | 107 ++++++-
- 3 files changed, 469 insertions(+), 51 deletions(-)
+ 3 files changed, 470 insertions(+), 51 deletions(-)
 
 --- a/drivers/net/ethernet/mediatek/mtk_eth_path.c
 +++ b/drivers/net/ethernet/mediatek/mtk_eth_path.c
@@ -390,24 +390,25 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  	/* Enable SGMII */
  	if (interface == PHY_INTERFACE_MODE_SGMII ||
  	    phy_interface_mode_is_8023z(interface))
-@@ -677,10 +762,13 @@ static void mtk_mac_link_down(struct phy
+@@ -676,10 +761,14 @@ static void mtk_mac_link_down(struct phy
  {
  	struct mtk_mac *mac = container_of(config, struct mtk_mac,
  					   phylink_config);
 -	u32 mcr = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
  
--	mcr &= ~(MAC_MCR_TX_EN | MAC_MCR_RX_EN);
+-	mcr &= ~(MAC_MCR_TX_EN | MAC_MCR_RX_EN | MAC_MCR_FORCE_LINK);
 -	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
 +	if (!mtk_interface_mode_is_xgmii(interface)) {
-+		mtk_m32(mac->hw, MAC_MCR_TX_EN | MAC_MCR_RX_EN, 0, MTK_MAC_MCR(mac->id));
-+		mtk_m32(mac->hw, MTK_XGMAC_FORCE_LINK(mac->id), 0, MTK_XGMAC_STS(mac->id));
-+	} else if (mac->id != MTK_GMAC1_ID) {
++		mtk_m32(mac->hw, MAC_MCR_TX_EN | MAC_MCR_RX_EN | MAC_MCR_FORCE_LINK, 0, MTK_MAC_MCR(mac->id));
++		if (mtk_is_netsys_v3_or_greater(mac->hw))
++			mtk_m32(mac->hw, MTK_XGMAC_FORCE_LINK(mac->id), 0, MTK_XGMAC_STS(mac->id));
++	} else if (mtk_is_netsys_v3_or_greater(mac->hw) && mac->id != MTK_GMAC1_ID) {
 +		mtk_m32(mac->hw, XMAC_MCR_TRX_DISABLE, XMAC_MCR_TRX_DISABLE, MTK_XMAC_MCR(mac->id));
 +	}
  }
  
  static void mtk_set_queue_speed(struct mtk_eth *eth, unsigned int idx,
-@@ -752,13 +840,11 @@ static void mtk_set_queue_speed(struct m
+@@ -751,13 +840,11 @@ static void mtk_set_queue_speed(struct m
  	mtk_w32(eth, val, soc->reg_map->qdma.qtx_sch + ofs);
  }
  
@@ -425,7 +426,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  	u32 mcr;
  
  	mcr = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
-@@ -792,9 +878,63 @@ static void mtk_mac_link_up(struct phyli
+@@ -791,9 +878,63 @@ static void mtk_mac_link_up(struct phyli
  	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
  }
  
@@ -470,7 +471,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
 +	struct mtk_mac *mac = container_of(config, struct mtk_mac,
 +					   phylink_config);
 +
-+	if (mtk_interface_mode_is_xgmii(interface))
++	if (mtk_is_netsys_v3_or_greater(mac->hw) && mtk_interface_mode_is_xgmii(interface))
 +		mtk_xgdm_mac_link_up(mac, phy, mode, interface, speed, duplex,
 +				     tx_pause, rx_pause);
 +	else
@@ -489,7 +490,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  	.mac_finish = mtk_mac_finish,
  	.mac_link_down = mtk_mac_link_down,
  	.mac_link_up = mtk_mac_link_up,
-@@ -3373,6 +3513,9 @@ static int mtk_open(struct net_device *d
+@@ -3372,6 +3513,9 @@ static int mtk_open(struct net_device *d
  	struct mtk_eth *eth = mac->hw;
  	int i, err;
  
@@ -499,7 +500,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  	err = phylink_of_phy_connect(mac->phylink, mac->of_node, 0);
  	if (err) {
  		netdev_err(dev, "%s: could not attach PHY: %d\n", __func__,
-@@ -3501,6 +3644,9 @@ static int mtk_stop(struct net_device *d
+@@ -3500,6 +3644,9 @@ static int mtk_stop(struct net_device *d
  	for (i = 0; i < ARRAY_SIZE(eth->ppe); i++)
  		mtk_ppe_stop(eth->ppe[i]);
  
@@ -509,7 +510,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  	return 0;
  }
  
-@@ -4498,6 +4644,7 @@ static const struct net_device_ops mtk_n
+@@ -4497,6 +4644,7 @@ static const struct net_device_ops mtk_n
  static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
  {
  	const __be32 *_id = of_get_property(np, "reg", NULL);
@@ -517,7 +518,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  	phy_interface_t phy_mode;
  	struct phylink *phylink;
  	struct mtk_mac *mac;
-@@ -4533,16 +4680,41 @@ static int mtk_add_mac(struct mtk_eth *e
+@@ -4532,16 +4680,41 @@ static int mtk_add_mac(struct mtk_eth *e
  	mac->id = id;
  	mac->hw = eth;
  	mac->of_node = np;
@@ -567,7 +568,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  	}
  
  	memset(mac->hwlro_ip, 0, sizeof(mac->hwlro_ip));
-@@ -4616,8 +4788,21 @@ static int mtk_add_mac(struct mtk_eth *e
+@@ -4615,8 +4788,21 @@ static int mtk_add_mac(struct mtk_eth *e
  		phy_interface_zero(mac->phylink_config.supported_interfaces);
  		__set_bit(PHY_INTERFACE_MODE_INTERNAL,
  			  mac->phylink_config.supported_interfaces);
@@ -589,7 +590,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  	phylink = phylink_create(&mac->phylink_config,
  				 of_fwnode_handle(mac->of_node),
  				 phy_mode, &mtk_phylink_ops);
-@@ -4662,6 +4847,26 @@ free_netdev:
+@@ -4661,6 +4847,26 @@ free_netdev:
  	return err;
  }
  
@@ -616,7 +617,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  void mtk_eth_set_dma_device(struct mtk_eth *eth, struct device *dma_dev)
  {
  	struct net_device *dev, *tmp;
-@@ -4805,7 +5010,8 @@ static int mtk_probe(struct platform_dev
+@@ -4804,7 +5010,8 @@ static int mtk_probe(struct platform_dev
  			regmap_write(cci, 0, 3);
  	}
  
@@ -626,7 +627,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  		err = mtk_sgmii_init(eth);
  
  		if (err)
-@@ -4916,6 +5122,24 @@ static int mtk_probe(struct platform_dev
+@@ -4915,6 +5122,24 @@ static int mtk_probe(struct platform_dev
  		}
  	}
  
@@ -651,7 +652,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  	if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT)) {
  		err = devm_request_irq(eth->dev, eth->irq[0],
  				       mtk_handle_irq, 0,
-@@ -5018,6 +5242,11 @@ static int mtk_remove(struct platform_de
+@@ -5017,6 +5242,11 @@ static int mtk_remove(struct platform_de
  		mtk_stop(eth->netdev[i]);
  		mac = netdev_priv(eth->netdev[i]);
  		phylink_disconnect_phy(mac->phylink);