brcm63xx: add linux 4.19 support

Boot tested on Comtrend AR-5387un:
https://gist.github.com/Noltari/57e5030455da8dc38e61f8c3a5922254

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
[jonas.gorski: make 4.19 an optional testing version; add gcc 8.3 fix]
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-4.19/101-MIPS-BCM63XX-add-USB-device-clock-enable-delay-to-cl.patch b/target/linux/brcm63xx/patches-4.19/101-MIPS-BCM63XX-add-USB-device-clock-enable-delay-to-cl.patch
new file mode 100644
index 0000000000..0bbf7c8e87
--- /dev/null
+++ b/target/linux/brcm63xx/patches-4.19/101-MIPS-BCM63XX-add-USB-device-clock-enable-delay-to-cl.patch
@@ -0,0 +1,41 @@
+From 8e9bf528a122741f0171b89c297b63041116d704 Mon Sep 17 00:00:00 2001
+From: Florian Fainelli <florian@openwrt.org>
+Date: Mon, 28 Jan 2013 20:06:20 +0100
+Subject: [PATCH 02/11] MIPS: BCM63XX: add USB device clock enable delay to
+ clock code
+
+This patch adds the required 10 micro seconds delay to the USB device
+clock enable operation. Put this where the correct clock knowledege is,
+which is in the clock code, and remove this delay from the bcm63xx_udc
+gadget driver where it was before.
+
+Signed-off-by: Florian Fainelli <florian@openwrt.org>
+---
+ arch/mips/bcm63xx/clk.c          |    5 +++++
+ drivers/usb/gadget/bcm63xx_udc.c |    1 -
+ 2 files changed, 5 insertions(+), 1 deletion(-)
+
+--- a/arch/mips/bcm63xx/clk.c
++++ b/arch/mips/bcm63xx/clk.c
+@@ -236,6 +236,11 @@ static void usbd_set(struct clk *clk, in
+ 		bcm_hwclock_set(CKCTL_6362_USBD_EN, enable);
+ 	else if (BCMCPU_IS_6368())
+ 		bcm_hwclock_set(CKCTL_6368_USBD_EN, enable);
++	else
++		return;
++
++	if (enable)
++		udelay(10);
+ }
+ 
+ static struct clk clk_usbd = {
+--- a/drivers/usb/gadget/udc/bcm63xx_udc.c
++++ b/drivers/usb/gadget/udc/bcm63xx_udc.c
+@@ -402,7 +402,6 @@ static inline void set_clocks(struct bcm
+ 	if (is_enabled) {
+ 		clk_enable(udc->usbh_clk);
+ 		clk_enable(udc->usbd_clk);
+-		udelay(10);
+ 	} else {
+ 		clk_disable(udc->usbd_clk);
+ 		clk_disable(udc->usbh_clk);