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Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0099-drm-vc4-Remove-extra-barrier-s-aroudn-CTnCA-CTnEA-se.patch')
-rw-r--r--target/linux/brcm2708/patches-4.4/0099-drm-vc4-Remove-extra-barrier-s-aroudn-CTnCA-CTnEA-se.patch33
1 files changed, 33 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0099-drm-vc4-Remove-extra-barrier-s-aroudn-CTnCA-CTnEA-se.patch b/target/linux/brcm2708/patches-4.4/0099-drm-vc4-Remove-extra-barrier-s-aroudn-CTnCA-CTnEA-se.patch
new file mode 100644
index 0000000000..e0862d8e3f
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0099-drm-vc4-Remove-extra-barrier-s-aroudn-CTnCA-CTnEA-se.patch
@@ -0,0 +1,33 @@
+From 9db0b8d54024bf5a2d0c3239aa571d890e8c8b3a Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Fri, 23 Oct 2015 12:33:43 +0100
+Subject: [PATCH 099/232] drm/vc4: Remove extra barrier()s aroudn CTnCA/CTnEA
+ setup.
+
+The writel() that these expand to already does barriers.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+---
+ drivers/gpu/drm/vc4/vc4_gem.c | 9 +++------
+ 1 file changed, 3 insertions(+), 6 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_gem.c
++++ b/drivers/gpu/drm/vc4/vc4_gem.c
+@@ -104,14 +104,11 @@ submit_cl(struct drm_device *dev, uint32
+ {
+ struct vc4_dev *vc4 = to_vc4_dev(dev);
+
+- V3D_WRITE(V3D_CTNCA(thread), start);
+- barrier();
+-
+- /* Set the end address of the control list. Writing this
+- * register is what starts the job.
++ /* Set the current and end address of the control list.
++ * Writing the end register is what starts the job.
+ */
++ V3D_WRITE(V3D_CTNCA(thread), start);
+ V3D_WRITE(V3D_CTNEA(thread), end);
+- barrier();
+ }
+
+ int