lbmk/config/coreboot/default/patches/0031-dell-3050micro-disable-nvme-hotplug.patch

From 4ffaddc37d30d39f25faeaef73046a6e2ce525e8 Mon Sep 17 00:00:00 2001
From: Leah Rowe <info@minifree.org>
Date: Wed, 11 Dec 2024 01:06:01 +0000
Subject: [PATCH 31/37] dell/3050micro: disable nvme hotplug

in my testing, when running my 3050micro for a few days,
the nvme would sometimes randomly rename.

e.g. nvme0n1 renamed to nvme0n2

this might cause crashes in linux, if booting only from the
nvme. in my case, i was booting from mdraid (sata+nvme) and
every few days, the nvme would rename at least once, causing
my RAID to become unsynced. since i'm using RAID1, this was
OK and I could simply re-sync the array, but this is quite
precarious indeed. if you're using raid0, that will potentially
corrupt your RAID array indefinitely.

this same issue manifested on the T480/T480 thinkpads, and
S3 resume would break because of that, when booting from nvme,
because the nvme would be "unplugged" and appear to linux as a
new device (the one that you booted from).

the fix there was to disable hotplugging on that pci-e slot
for the nvme, so apply the same fix here for 3050 micro

Signed-off-by: Leah Rowe <leah@libreboot.org>
---
 src/mainboard/dell/optiplex_3050/devicetree.cb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mainboard/dell/optiplex_3050/devicetree.cb b/src/mainboard/dell/optiplex_3050/devicetree.cb
index da11085ab6..2a97306c5d 100644
--- a/src/mainboard/dell/optiplex_3050/devicetree.cb
+++ b/src/mainboard/dell/optiplex_3050/devicetree.cb
@@ -45,7 +45,9 @@ chip soc/intel/skylake
 			register "PcieRpAdvancedErrorReporting[20]"     = "1"
 			register "PcieRpLtrEnable[20]"                  = "true"
 			register "PcieRpClkSrcNumber[20]"               = "3"
-			register "PcieRpHotPlug[20]"                    = "1"
+# disable hotplug on nvme to prevent renaming e.g. nvme0n1 rename to nvme0n2,
+# which could cause crashes in linux if booting from nvme
+			register "PcieRpHotPlug[20]"                    = "0"
 		end
 
 		# Realtek LAN
-- 
2.39.5