From 268a508efa9c694f4cc80602f04f681b269b193e Mon Sep 17 00:00:00 2001
From: Christian Lachner <gladiac@gmail.com>
Date: Fri, 27 Feb 2026 10:07:27 +0100
Subject: [PATCH] dcn_regdump.sh: improve dcn version detection

The old code only detected patterns in the form of x.y.z . However, the
reporting for some GPUs is just in the form of x.y (eg. 7800XT which is DCN 3.2
(without leading ".0"). This change adds detection support for both variants.
---
 dcn_regdump.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dcn_regdump.sh b/dcn_regdump.sh
index 3eb0d31..98a84f6 100755
--- a/dcn_regdump.sh
+++ b/dcn_regdump.sh
@@ -105,10 +105,10 @@ detect_dcn_version() {
 	local bdf="${gpu_bdf#*:}"   # strip domain prefix (0000:03:00.0 → 03:00.0)
 	local ver
 	# Try BDF-scoped match first (e.g. "amdgpu 0000:03:00.0: ... DCN 3.2.1")
-	ver=$(dmesg 2>/dev/null | grep "$bdf" | grep -oE 'initialized on DCN [0-9]+\.[0-9]+\.[0-9]+' | tail -1 | awk '{print $NF}')
+	ver=$(dmesg 2>/dev/null | grep "$bdf" | grep -oE 'initialized on DCN [0-9]+\.[0-9]+(\.[0-9]+)?' | tail -1 | sed -e's/^.* \([0-9.]\+\)$/\1/' -e's/^\([0-9]\.[0-9.]\)$/\1.0/')
 	# Fall back to any matching dmesg line
 	if [ -z "$ver" ]; then
-		ver=$(dmesg 2>/dev/null | grep -oE 'initialized on DCN [0-9]+\.[0-9]+\.[0-9]+' | tail -1 | awk '{print $NF}')
+		ver=$(dmesg 2>/dev/null | grep -oE 'initialized on DCN [0-9]+\.[0-9]+(\.[0-9]+)?' | tail -1 | sed -e's/^.* \([0-9.]\+\)$/\1/' -e's/^\([0-9]\.[0-9.]\)$/\1.0/')
 	fi
 	echo "$ver"
 }