brcm2708: add linux 4.4 support

- random-bcm2708 and spi-bcm2708 have been removed.
- sound-soc-bcm2708-i2s has been upstreamed as sound-soc-bcm2835-i2s.

Let's keep linux 4.1 for a while, since linux 4.4 appears to have some issues
with multicast traffic on RPi ethernet:
https://gist.github.com/Noltari/5b1cfdecce5ed4bc08fd

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

SVN-Revision: 48266

1 files changed, 63 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0096-drm-vc4-Drop-struct_mutex-around-CL-validation.patch b/target/linux/brcm2708/patches-4.4/0096-drm-vc4-Drop-struct_mutex-around-CL-validation.patch
new file mode 100644
index 0000000000..7796399453
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0096-drm-vc4-Drop-struct_mutex-around-CL-validation.patch
@@ -0,0 +1,63 @@
+From 6a9940a2bde49eda470e58f19a6bde3ded87d7fb Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Mon, 19 Oct 2015 08:44:35 -0700
+Subject: [PATCH 096/127] drm/vc4: Drop struct_mutex around CL validation.
+
+We were using it so that we could make sure that shader validation
+state didn't change while we were validating, but now shader
+validation state is immutable.  The bcl/rcl generation doesn't do any
+other BO dereferencing, and seems to have no other global state
+dependency not covered by job_lock / bo_lock.
+
+Fixes a lock order reversal between mmap_sem and struct_mutex.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+---
+ drivers/gpu/drm/vc4/vc4_gem.c | 12 ++++--------
+ 1 file changed, 4 insertions(+), 8 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_gem.c
++++ b/drivers/gpu/drm/vc4/vc4_gem.c
+@@ -244,13 +244,15 @@ static void
+ vc4_queue_submit(struct drm_device *dev, struct vc4_exec_info *exec)
+ {
+ 	struct vc4_dev *vc4 = to_vc4_dev(dev);
+-	uint64_t seqno = ++vc4->emit_seqno;
++	uint64_t seqno;
+ 	unsigned long irqflags;
+ 
++	spin_lock_irqsave(&vc4->job_lock, irqflags);
++
++	seqno = ++vc4->emit_seqno;
+ 	exec->seqno = seqno;
+ 	vc4_update_bo_seqnos(exec, seqno);
+ 
+-	spin_lock_irqsave(&vc4->job_lock, irqflags);
+ 	list_add_tail(&exec->head, &vc4->job_list);
+ 
+ 	/* If no job was executing, kick ours off.  Otherwise, it'll
+@@ -608,8 +610,6 @@ vc4_submit_cl_ioctl(struct drm_device *d
+ 	exec->args = args;
+ 	INIT_LIST_HEAD(&exec->unref_list);
+ 
+-	mutex_lock(&dev->struct_mutex);
+-
+ 	ret = vc4_cl_lookup_bos(dev, file_priv, exec);
+ 	if (ret)
+ 		goto fail;
+@@ -636,15 +636,11 @@ vc4_submit_cl_ioctl(struct drm_device *d
+ 	/* Return the seqno for our job. */
+ 	args->seqno = vc4->emit_seqno;
+ 
+-	mutex_unlock(&dev->struct_mutex);
+-
+ 	return 0;
+ 
+ fail:
+ 	vc4_complete_exec(exec);
+ 
+-	mutex_unlock(&dev->struct_mutex);
+-
+ 	return ret;
+ }
+