kernel: fix bgmac support for BCM5358

Fix two long-standing regressions.

Fixes: https://github.com/openwrt/openwrt/issues/8278
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 5e48c534f7c6b3a861f4a2dbb81d7bfcd9606f61)

2 files changed, 82 insertions, 6 deletions

diff --git a/target/linux/generic/backport-5.4/711-v6.3-bgmac-fix-initial-chip-reset-to-support-BCM5358.patch b/target/linux/generic/backport-5.4/711-v6.3-bgmac-fix-initial-chip-reset-to-support-BCM5358.patch
new file mode 100644
index 0000000000..54f077b544
--- /dev/null
+++ b/target/linux/generic/backport-5.4/711-v6.3-bgmac-fix-initial-chip-reset-to-support-BCM5358.patch
@@ -0,0 +1,76 @@
+From 327dabbd0111910a7d174b0b812d608d6b67bead Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Mon, 8 Aug 2022 23:05:25 +0200
+Subject: [PATCH] bgmac: fix *initial* chip reset to support BCM5358
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+While bringing hardware up we should perform a full reset including the
+switch bit (BGMAC_BCMA_IOCTL_SW_RESET aka SICF_SWRST). It's what
+specification says and what reference driver does.
+
+This seems to be critical for the BCM5358. Without this hardware doesn't
+get initialized properly and doesn't seem to transmit or receive any
+packets.
+
+Originally bgmac was calling bgmac_chip_reset() before setting
+"has_robosw" property which resulted in expected behaviour. That has
+changed as a side effect of adding platform device support which
+regressed BCM5358 support.
+
+Fixes: f6a95a24957a ("net: ethernet: bgmac: Add platform device support")
+Cc: Jon Mason <jdmason@kudzu.us>
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+---
+ drivers/net/ethernet/broadcom/bgmac.c | 8 ++++++--
+ drivers/net/ethernet/broadcom/bgmac.h | 2 ++
+ 2 files changed, 8 insertions(+), 2 deletions(-)
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -890,13 +890,13 @@ static void bgmac_chip_reset_idm_config(
+ 
+ 		if (iost & BGMAC_BCMA_IOST_ATTACHED) {
+ 			flags = BGMAC_BCMA_IOCTL_SW_CLKEN;
+-			if (!bgmac->has_robosw)
++			if (bgmac->in_init || !bgmac->has_robosw)
+ 				flags |= BGMAC_BCMA_IOCTL_SW_RESET;
+ 		}
+ 		bgmac_clk_enable(bgmac, flags);
+ 	}
+ 
+-	if (iost & BGMAC_BCMA_IOST_ATTACHED && !bgmac->has_robosw)
++	if (iost & BGMAC_BCMA_IOST_ATTACHED && (bgmac->in_init || !bgmac->has_robosw))
+ 		bgmac_idm_write(bgmac, BCMA_IOCTL,
+ 				bgmac_idm_read(bgmac, BCMA_IOCTL) &
+ 				~BGMAC_BCMA_IOCTL_SW_RESET);
+@@ -1489,6 +1489,8 @@ int bgmac_enet_probe(struct bgmac *bgmac
+ 	struct net_device *net_dev = bgmac->net_dev;
+ 	int err;
+ 
++	bgmac->in_init = true;
++
+ 	bgmac_chip_intrs_off(bgmac);
+ 
+ 	net_dev->irq = bgmac->irq;
+@@ -1538,6 +1540,8 @@ int bgmac_enet_probe(struct bgmac *bgmac
+ 	net_dev->hw_features = net_dev->features;
+ 	net_dev->vlan_features = net_dev->features;
+ 
++	bgmac->in_init = false;
++
+ 	err = register_netdev(bgmac->net_dev);
+ 	if (err) {
+ 		dev_err(bgmac->dev, "Cannot register net device\n");
+--- a/drivers/net/ethernet/broadcom/bgmac.h
++++ b/drivers/net/ethernet/broadcom/bgmac.h
+@@ -511,6 +511,8 @@ struct bgmac {
+ 	int irq;
+ 	u32 int_mask;
+ 
++	bool in_init;
++
+ 	/* Current MAC state */
+ 	int mac_speed;
+ 	int mac_duplex;
diff --git a/target/linux/generic/hack-5.4/773-bgmac-add-srab-switch.patch b/target/linux/generic/hack-5.4/773-bgmac-add-srab-switch.patch
index 89e0df4606..6398cd5893 100644
--- a/target/linux/generic/hack-5.4/773-bgmac-add-srab-switch.patch
+++ b/target/linux/generic/hack-5.4/773-bgmac-add-srab-switch.patch
@@ -14,7 +14,7 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
 
 --- a/drivers/net/ethernet/broadcom/bgmac-bcma.c
 +++ b/drivers/net/ethernet/broadcom/bgmac-bcma.c
-@@ -268,6 +268,7 @@ static int bgmac_probe(struct bcma_devic
+@@ -280,6 +280,7 @@ static int bgmac_probe(struct bcma_devic
  		bgmac->feature_flags |= BGMAC_FEAT_CLKCTLST;
  		bgmac->feature_flags |= BGMAC_FEAT_NO_RESET;
  		bgmac->feature_flags |= BGMAC_FEAT_FORCE_SPEED_2500;
@@ -50,7 +50,7 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  /**************************************************
   * MII
   **************************************************/
-@@ -1538,6 +1550,14 @@ int bgmac_enet_probe(struct bgmac *bgmac
+@@ -1540,6 +1552,14 @@ int bgmac_enet_probe(struct bgmac *bgmac
  	net_dev->hw_features = net_dev->features;
  	net_dev->vlan_features = net_dev->features;
  
@@ -62,10 +62,10 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
 +			bgmac->b53_device = &bgmac_b53_dev;
 +	}
 +
+ 	bgmac->in_init = false;
+ 
  	err = register_netdev(bgmac->net_dev);
- 	if (err) {
- 		dev_err(bgmac->dev, "Cannot register net device\n");
-@@ -1560,6 +1580,10 @@ EXPORT_SYMBOL_GPL(bgmac_enet_probe);
+@@ -1564,6 +1584,10 @@ EXPORT_SYMBOL_GPL(bgmac_enet_probe);
  
  void bgmac_enet_remove(struct bgmac *bgmac)
  {
@@ -86,7 +86,7 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  
  struct bgmac_slot_info {
  	union {
-@@ -532,6 +533,9 @@ struct bgmac {
+@@ -534,6 +535,9 @@ struct bgmac {
  	void (*cmn_maskset32)(struct bgmac *bgmac, u16 offset, u32 mask,
  			      u32 set);
  	int (*phy_connect)(struct bgmac *bgmac);