brcm2708: switch to linux 4.4 and update patches

As usual these patches were extracted from:
https://github.com/raspberrypi/linux/commits/rpi-4.4.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 48765

1 files changed, 28 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0141-BCM270X_DT-Disable-DMA-for-bcm2835-sdhost-on-Pi2.patch b/target/linux/brcm2708/patches-4.4/0141-BCM270X_DT-Disable-DMA-for-bcm2835-sdhost-on-Pi2.patch
new file mode 100644
index 0000000000..40624dbbfe
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0141-BCM270X_DT-Disable-DMA-for-bcm2835-sdhost-on-Pi2.patch
@@ -0,0 +1,28 @@
+From 403252ab4bc6c77f2859410e6fa22f3c2bded3e5 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Wed, 3 Feb 2016 16:12:54 +0000
+Subject: [PATCH 141/156] BCM270X_DT: Disable DMA for bcm2835-sdhost on Pi2
+
+This is an interim patch to verify that problems seen with
+some cards can be worked around at the expense of an increased
+CPU load by forcing PIO mode.
+
+Although this could have used the brcm,force-pio attribute, that
+is a boolean (true if present, false if absent) and attributes
+can't be deleted by overlays. Instead, make brcm,pio-limit
+unfeasibly high instead to allow DMA to be re-enabled using the
+pio_limit parameter of the sdhost or sdtweak overlays.
+---
+ arch/arm/boot/dts/bcm2709-rpi-2-b.dts | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/arch/arm/boot/dts/bcm2709-rpi-2-b.dts
++++ b/arch/arm/boot/dts/bcm2709-rpi-2-b.dts
+@@ -43,6 +43,7 @@
+ 	pinctrl-names = "default";
+ 	pinctrl-0 = <&sdhost_pins>;
+ 	bus-width = <4>;
++	brcm,pio-limit = <0x7fffffff>;
+ 	status = "okay";
+ };
+