From 7f06e5f7f22ea75619aaeb7b6dde713c5f6ed5a7 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Mon, 10 Jul 2023 11:38:23 +0200 Subject: [PATCH] kernel: bgmac: fix regressed support for BCM53573 SoCs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Rafał Miłecki (cherry picked from commit d54f3b2cfdbd34aa61ca67fd590eebfdf3db51cf) --- ...ne-turning-IRQs-off-to-avoid-SoC-han.patch | 45 +++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 target/linux/generic/backport-5.4/712-v6.5-net-bgmac-postpone-turning-IRQs-off-to-avoid-SoC-han.patch diff --git a/target/linux/generic/backport-5.4/712-v6.5-net-bgmac-postpone-turning-IRQs-off-to-avoid-SoC-han.patch b/target/linux/generic/backport-5.4/712-v6.5-net-bgmac-postpone-turning-IRQs-off-to-avoid-SoC-han.patch new file mode 100644 index 00000000000..2f3aa1caed1 --- /dev/null +++ b/target/linux/generic/backport-5.4/712-v6.5-net-bgmac-postpone-turning-IRQs-off-to-avoid-SoC-han.patch @@ -0,0 +1,45 @@ +From e7731194fdf085f46d58b1adccfddbd0dfee4873 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= +Date: Fri, 7 Jul 2023 08:53:25 +0200 +Subject: [PATCH] net: bgmac: postpone turning IRQs off to avoid SoC hangs +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Turning IRQs off is done by accessing Ethernet controller registers. +That can't be done until device's clock is enabled. It results in a SoC +hang otherwise. + +This bug remained unnoticed for years as most bootloaders keep all +Ethernet interfaces turned on. It seems to only affect a niche SoC +family BCM47189. It has two Ethernet controllers but CFE bootloader uses +only the first one. + +Fixes: 34322615cbaa ("net: bgmac: Mask interrupts during probe") +Signed-off-by: Rafał Miłecki +Reviewed-by: Michal Kubiak +Signed-off-by: David S. Miller +--- + drivers/net/ethernet/broadcom/bgmac.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +--- a/drivers/net/ethernet/broadcom/bgmac.c ++++ b/drivers/net/ethernet/broadcom/bgmac.c +@@ -1491,8 +1491,6 @@ int bgmac_enet_probe(struct bgmac *bgmac + + bgmac->in_init = true; + +- bgmac_chip_intrs_off(bgmac); +- + net_dev->irq = bgmac->irq; + SET_NETDEV_DEV(net_dev, bgmac->dev); + dev_set_drvdata(bgmac->dev, bgmac); +@@ -1510,6 +1508,8 @@ int bgmac_enet_probe(struct bgmac *bgmac + */ + bgmac_clk_enable(bgmac, 0); + ++ bgmac_chip_intrs_off(bgmac); ++ + /* This seems to be fixing IRQ by assigning OOB #6 to the core */ + if (!(bgmac->feature_flags & BGMAC_FEAT_IDM_MASK)) { + if (bgmac->feature_flags & BGMAC_FEAT_IRQ_ID_OOB_6)