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build_patches: add fix for 2.4 GHz on Archer C50 v4

Fixes low signal issue for 2.4 GHz for the TP-Link Archer C50 v4.
The first two bytes in the eeprom are the chip id. The working
devices have 0x7628 there, whereas the non-working devices have
0x7600 there. This chip id gets checked by the function
mt7603_check_eeprom() which leads the driver to ignore the
contents of the eeprom partition and load default values from otp.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Fabian Bläse <fabian@blaese.de>
master
Adrian Schmutzler 4 months ago
parent
commit
87d875cd94
1 changed files with 50 additions and 0 deletions
  1. +50
    -0
      build_patches/openwrt/0031-mt76-mt7603-allow-eeprom-sections-starting-with-7600.patch

+ 50
- 0
build_patches/openwrt/0031-mt76-mt7603-allow-eeprom-sections-starting-with-7600.patch View File

@ -0,0 +1,50 @@
From: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Date: Fri, 16 Oct 2020 13:36:02 +0200
Subject: mt76: mt7603: allow eeprom sections starting with 7600
Fixes low signal issue for 2.4 GHz for the TP-Link Archer C50 v4.
The first two bytes in the eeprom are the chip id. The working
devices have 0x7628 there, whereas the non-working devices have
0x7600 there. This chip id gets checked by the function
mt7603_check_eeprom() which leads the driver to ignore the
contents of the eeprom partition and load default values from otp.
The has been manually added based on mt76 PR:
https://github.com/openwrt/mt76/pull/442/
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
diff --git a/package/kernel/mt76/patches/0001-fix-archer-c50-v4.patch b/package/kernel/mt76/patches/0001-fix-archer-c50-v4.patch
new file mode 100644
index 0000000000000000000000000000000000000000..29e422dc0c7f3046be0aa761bcfe8db1e298ed88
--- /dev/null
+++ b/package/kernel/mt76/patches/0001-fix-archer-c50-v4.patch
@@ -0,0 +1,28 @@
+From b0c7f88d900d2986cd2061113201825eda6a6482 Mon Sep 17 00:00:00 2001
+From: Ron Asimi <ron.asimi@gmail.com>
+Date: Wed, 2 Sep 2020 23:18:23 -0400
+Subject: [PATCH] mt7603: allow eeprom sections starting with 7600
+
+Fixes low signal issue for 2.4 GHz for the TP-Link Archer C50 v4.
+The first two bytes in the eeprom are the chip id. The working
+devices have 0x7628 there, whereas the non-working devices have
+0x7600 there. This chip id gets checked by the function
+mt7603_check_eeprom() which leads the driver to ignore the contents
+of the eeprom partition and load default values from otp.
+
+---
+ mt7603/eeprom.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/mt7603/eeprom.c b/mt7603/eeprom.c
+index 01f1e0da..9d5042af 100644
+--- a/mt7603/eeprom.c
++++ b/mt7603/eeprom.c
+@@ -136,6 +136,7 @@ static int mt7603_check_eeprom(struct mt76_dev *dev)
+ switch (val) {
+ case 0x7628:
+ case 0x7603:
++ case 0x7600:
+ return 0;
+ default:
+ return -EINVAL;

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