target/linux/generic/backport-6.1/701-v6.5-net-bgmac-postpone-turning-IRQs-off-to-avoid-SoC-han.patch

   1 From e7731194fdf085f46d58b1adccfddbd0dfee4873 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   3 Date: Fri, 7 Jul 2023 08:53:25 +0200
   4 Subject: [PATCH] net: bgmac: postpone turning IRQs off to avoid SoC hangs
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Turning IRQs off is done by accessing Ethernet controller registers.
  10 That can't be done until device's clock is enabled. It results in a SoC
  11 hang otherwise.
  12
  13 This bug remained unnoticed for years as most bootloaders keep all
  14 Ethernet interfaces turned on. It seems to only affect a niche SoC
  15 family BCM47189. It has two Ethernet controllers but CFE bootloader uses
  16 only the first one.
  17
  18 Fixes: 34322615cbaa ("net: bgmac: Mask interrupts during probe")
  19 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  20 Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
  21 Signed-off-by: David S. Miller <davem@davemloft.net>
  22 ---
  23  drivers/net/ethernet/broadcom/bgmac.c | 4 ++--
  24  1 file changed, 2 insertions(+), 2 deletions(-)
  25
  26 --- a/drivers/net/ethernet/broadcom/bgmac.c
  27 +++ b/drivers/net/ethernet/broadcom/bgmac.c
  28 @@ -1492,8 +1492,6 @@ int bgmac_enet_probe(struct bgmac *bgmac
  29
  30         bgmac->in_init = true;
  31
  32 -       bgmac_chip_intrs_off(bgmac);
  33 -
  34         net_dev->irq = bgmac->irq;
  35         SET_NETDEV_DEV(net_dev, bgmac->dev);
  36         dev_set_drvdata(bgmac->dev, bgmac);
  37 @@ -1511,6 +1509,8 @@ int bgmac_enet_probe(struct bgmac *bgmac
  38          */
  39         bgmac_clk_enable(bgmac, 0);
  40
  41 +       bgmac_chip_intrs_off(bgmac);
  42 +
  43         /* This seems to be fixing IRQ by assigning OOB #6 to the core */
  44         if (!(bgmac->feature_flags & BGMAC_FEAT_IDM_MASK)) {
  45                 if (bgmac->feature_flags & BGMAC_FEAT_IRQ_ID_OOB_6)