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From:   Chen-Yu Tsai <wens@kernel.org>
To:     seth.forshee@canonical.com
Cc:     Chen-Yu Tsai <wens@csie.org>, wireless-regdb@lists.infradead.org,
        linux-wireless@vger.kernel.org
Subject: [PATCH] wireless-regdb: Extend 5470-5725 MHz range to 5730 MHz for Taiwan (TW)
Date:   Fri, 26 Jul 2019 11:05:38 +0800
Message-Id: <20190726030538.16784-1-wens@kernel.org>
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From: Chen-Yu Tsai <wens@csie.org>

This range ends at 5725 MHz, but channel 144 extends to 5730 MHz.
The Linux kernel however does not seem capable of considering them
most restrictive subset of multiple rules.

Since 5725 ~ 5730 MHz belongs to the next range which has looser
requirements, we can do this manually and extend the range by 5 MHz
to make the kernel happy and be able to use channel 144.

Also, looking at the US regulations, which the TW ones are based on,
The DFS range ends at 5730 MHz, while the next range starts at 5735
MHz. This doesn't match the actual regulations, but is skewed to meet
wireless channel boundaries. I prefer the database match the law,
and be adjuested only if necessary.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---

I have a vague impression that you asked about the range boundaries
when I first updated the rules for Taiwan. And here we are again.

---
 db.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/db.txt b/db.txt
index 37393e6..2e149b6 100644
--- a/db.txt
+++ b/db.txt
@@ -1249,7 +1249,11 @@ country TW: DFS-FCC
 	# 5.15 ~ 5.25 GHz: 30 dBm for master mode, 23 dBm for clients
 	(5150 - 5250 @ 80), (23), AUTO-BW
 	(5250 - 5350 @ 80), (23), DFS, AUTO-BW
-	(5470 - 5725 @ 160), (23), DFS
+	# This range ends at 5725 MHz, but channel 144 extends to 5730 MHz.
+	# Since 5725 ~ 5730 MHz belongs to the next range which has looser
+	# requirements, we can extend the range by 5 MHz to make the kernel
+	# happy and be able to use channel 144.
+	(5470 - 5730 @ 160), (23), DFS
 	(5725 - 5850 @ 80), (30)
 	# 60g band, LP0002 section 3.13.1.1 (3)(C), EIRP=40dBm(43dBm peak)
 	(57000 - 66000 @ 2160), (40)
-- 
2.20.1