generic: 5.15: mtk_eth_soc: backport fix for hang on link up

Backport commit faa5f17fe2 ("kernel: mtk_eth_soc: release
MAC_MCR_FORCE_LINK only when MAC is up") to Linux 5.15 as well.

Signed-off-by: Daniel Golle <[email protected]>

target/linux/generic/pending-5.15/735-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 <[email protected]>
+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 <[email protected]>
+---
+ 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
+@@ -619,8 +619,7 @@ 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)
+@@ -636,7 +635,7 @@ 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));
+ }
+ 
+@@ -745,7 +744,7 @@ 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));
+ }
+ 

target/linux/generic/pending-5.15/737-net-ethernet-mtk_eth_soc-add-paths-and-SerDes-modes-.patch

@@ -387,24 +387,25 @@ Signed-off-by: Daniel Golle <[email protected]>
  	return;
  
  err_phy:
-@@ -634,10 +698,13 @@ static void mtk_mac_link_down(struct phy
+@@ -633,10 +697,14 @@ 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));
++		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(eth))
++			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, 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,
-@@ -709,13 +776,11 @@ static void mtk_set_queue_speed(struct m
+@@ -708,13 +776,11 @@ static void mtk_set_queue_speed(struct m
  	mtk_w32(eth, val, soc->reg_map->qdma.qtx_sch + ofs);
  }
  
@@ -422,7 +423,7 @@ Signed-off-by: Daniel Golle <[email protected]>
  	u32 mcr;
  
  	mcr = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
-@@ -749,6 +814,55 @@ static void mtk_mac_link_up(struct phyli
+@@ -748,6 +814,55 @@ static void mtk_mac_link_up(struct phyli
  	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
  }
  
@@ -478,7 +479,7 @@ Signed-off-by: Daniel Golle <[email protected]>
  static const struct phylink_mac_ops mtk_phylink_ops = {
  	.validate = phylink_generic_validate,
  	.mac_select_pcs = mtk_mac_select_pcs,
-@@ -4563,8 +4677,21 @@ static int mtk_add_mac(struct mtk_eth *e
+@@ -4562,8 +4677,21 @@ 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);
@@ -500,7 +501,7 @@ Signed-off-by: Daniel Golle <[email protected]>
  	phylink = phylink_create(&mac->phylink_config,
  				 of_fwnode_handle(mac->of_node),
  				 phy_mode, &mtk_phylink_ops);
-@@ -4757,6 +4884,13 @@ static int mtk_probe(struct platform_dev
+@@ -4756,6 +4884,13 @@ static int mtk_probe(struct platform_dev
  
  		if (err)
  			return err;