raspberrypi4: Fix WiFi

Apply patch from branch master of meta-raspberrypi as a bbappend
to recipe linux-firmware-rpidistro to fix WiFi on Raspberry Pi 4.
This is a temporary solution while AGL master is still based on
Thud. As soon as AGL moves to newer release of the Yocto Project
and layer meta-raspberrypi this patch will become reduntant.

The change of boardflags3 value from "0x48200100" to "0x44200100"
has been done already in Raspbian (2019-06-20). For more details:
https://github.com/RPi-Distro/firmware-nonfree/issues/3

Bug-AGL: SPEC-2656

Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Change-Id: Ifaafbae6ff59a43f95926e64f1ce35aefadd3cfa

2 files changed, 49 insertions, 0 deletions

diff --git a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux-firmware-rpidistro/linux-firmware-rpidistro/0001-brcmfmac43455-sdio.txt-Follow-raspbian-change-for-bo.patch b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux-firmware-rpidistro/linux-firmware-rpidistro/0001-brcmfmac43455-sdio.txt-Follow-raspbian-change-for-bo.patch
new file mode 100644
index 000000000..1ad0fd1b2
--- /dev/null
+++ b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux-firmware-rpidistro/linux-firmware-rpidistro/0001-brcmfmac43455-sdio.txt-Follow-raspbian-change-for-bo.patch
@@ -0,0 +1,39 @@
+From c9d4f263131cb8e62597e0a296968b5cdbfe0019 Mon Sep 17 00:00:00 2001
+From: Andrei Gherzan <andrei@gherzan.ro>
+Date: Thu, 27 Jun 2019 20:49:10 +0100
+Subject: [PATCH] brcmfmac43455-sdio.txt: Follow raspbian change for
+ boardflags3
+
+Without this change the WiFi interface on RPi4 never comes up. Also the
+upstream repository doesn't include this change. It is only (as far as I
+know) part of the raspberrypi deb repository with the following
+changelog:
+
+firmware-nonfree (1:20190114-1+rpt2) buster; urgency=medium
+  * Update brcmfmac43455-sdio.txt
+    - Update boardflags3
+ -- Serge Schneider <serge@raspberrypi.org>  Thu, 18 Apr 2019 14:35:34
++0100
+
+Upstream-status: Pending
+Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>
+---
+ brcm/brcmfmac43455-sdio.txt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/brcm/brcmfmac43455-sdio.txt b/brcm/brcmfmac43455-sdio.txt
+index 54d9321..6801286 100644
+--- a/brcm/brcmfmac43455-sdio.txt
++++ b/brcm/brcmfmac43455-sdio.txt
+@@ -21,7 +21,7 @@ btc_mode=1
+ #            bit1 for btcoex
+ boardflags=0x00480201
+ boardflags2=0x40800000
+-boardflags3=0x48200100
++boardflags3=0x44200100
+ phycal_tempdelta=15
+ rxchain=1
+ txchain=1
+-- 
+2.17.1
+
diff --git a/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux-firmware-rpidistro/linux-firmware-rpidistro_%.bbappend b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux-firmware-rpidistro/linux-firmware-rpidistro_%.bbappend
new file mode 100644
index 000000000..30c18fb0b
--- /dev/null
+++ b/meta-agl-bsp/meta-raspberrypi/recipes-kernel/linux-firmware-rpidistro/linux-firmware-rpidistro_%.bbappend
@@ -0,0 +1,10 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+
+SRC_URI += "file://0001-brcmfmac43455-sdio.txt-Follow-raspbian-change-for-bo.patch"
+
+do_unpack_append() {
+    bb.build.exec_func('do_clean_pc', d)
+}
+do_clean_pc() {
+    rm -rf ${S}/.pc
+}