[openwrt/openwrt] realtek: rt-loader: fix chip revision printout

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/168f5609aff27b1db87b7fa79717a3271f02f83a

commit 168f5609aff27b1db87b7fa79717a3271f02f83a
Author: Markus Stockhausen <markus.stockhausen at gmx.de>
AuthorDate: Sun Jan 11 14:43:07 2026 +0100

    realtek: rt-loader: fix chip revision printout
    
    There is currently a mismatch in the detection of the chip type.
    rt-loader and the kernel give different revisions. E.g.
    
    rt-loader: Running on RTL9313 (chip id 6567A) with 256MB
    kernel: Realtek RTL9313 rev B (6567) SoC with 256 MB
    
    Realtek internal version numbering is
    
    - for RTL838x: 1=A, 2=B, ...
    - for others: 0=A, 1=B, ...
    
    rt-loader does not differentiate that. Adapt the calculation to
    give a consistent picture.
    
    Signed-off-by: Markus Stockhausen <markus.stockhausen at gmx.de>
    Link: https://github.com/openwrt/openwrt/pull/21498
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 target/linux/realtek/image/rt-loader/src/board.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/target/linux/realtek/image/rt-loader/src/board.c b/target/linux/realtek/image/rt-loader/src/board.c
index 837da74b6a..881c7cde24 100644
--- a/target/linux/realtek/image/rt-loader/src/board.c
+++ b/target/linux/realtek/image/rt-loader/src/board.c
@@ -91,10 +91,12 @@ found:
 	val = ioread32(reg + 4);
 	chip_id = val & 0xffff;
 
-	if (model_id < 0x9300)
-		chip_version = val >> 16 & 0x1f;
+	if (model_id < 0x8390)
+		chip_version = (val >> 16) & 0x1f;
+	else if (model_id < 0x9300)
+		chip_version = ((val >> 16) & 0x1f) + 1;
 	else
-		chip_version = val >> 28 & 0x0f;
+		chip_version = ((val >> 28) & 0x0f) + 1;
 
 	snprintf(buffer, len, "RTL%04X%c (chip id %04x%c)",
 		 model_id, model_version ? model_version + 64 : 0,