diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0378-PCI-brcmstb-Restore-initial-fundamental-reset.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.10/950-0378-PCI-brcmstb-Restore-initial-fundamental-reset.patch | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0378-PCI-brcmstb-Restore-initial-fundamental-reset.patch b/target/linux/bcm27xx/patches-5.10/950-0378-PCI-brcmstb-Restore-initial-fundamental-reset.patch new file mode 100644 index 0000000000..f4b85020b5 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.10/950-0378-PCI-brcmstb-Restore-initial-fundamental-reset.patch @@ -0,0 +1,35 @@ +From 92f08923793d755a2eb1bf4724c6b6764cfba071 Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.com> +Date: Wed, 11 Nov 2020 17:08:33 +0000 +Subject: [PATCH] PCI: brcmstb: Restore initial fundamental reset + +[1] replaced a single reset function with a pointer to one of two +implementations, but also removed the call asserting the reset +at the start of brcm_pcie_setup. Doing so breaks Raspberry Pis with +VL805 XHCI controllers lacking dedicated SPI EEPROMs, which have been +used for USB booting but then need to be reset so that the kernel +can reconfigure them. The lack of a reset causes the firmware's loading +of the EEPROM image to RAM to fail, breaking USB for the kernel. + +See: https://www.raspberrypi.org/forums/viewtopic.php?p=1758157#p1758157 + +Fixes: 04356ac30771 ("PCI: brcmstb: Add bcm7278 PERST# support") + +[1] 04356ac30771 ("PCI: brcmstb: Add bcm7278 PERST# support") + +Signed-off-by: Phil Elwell <phil@raspberrypi.com> +--- + drivers/pci/controller/pcie-brcmstb.c | 2 ++ + 1 file changed, 2 insertions(+) + +--- a/drivers/pci/controller/pcie-brcmstb.c ++++ b/drivers/pci/controller/pcie-brcmstb.c +@@ -871,6 +871,8 @@ static int brcm_pcie_setup(struct brcm_p + + /* Reset the bridge */ + pcie->bridge_sw_init_set(pcie, 1); ++ pcie->perst_set(pcie, 1); ++ + usleep_range(100, 200); + + /* Take the bridge out of reset */ |