Patch "drm: add helper to check for wc memory support" has been added to the 4.4-stable tree

Patch "drm: add helper to check for wc memory support" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm: add helper to check for wc memory support

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-add-helper-to-check-for-wc-memory-support.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 4b0e4e4af6c6dc8354dcb72182d52c1bc55f12fc Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@redhat.com>
Date: Sat, 30 Jan 2016 07:59:32 +0200
Subject: drm: add helper to check for wc memory support
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Dave Airlie <airlied@redhat.com>

commit 4b0e4e4af6c6dc8354dcb72182d52c1bc55f12fc upstream.

Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/drm/drm_cache.h b/include/drm/drm_cache.h
index 7bfb063029d8..461a0558bca4 100644
--- a/include/drm/drm_cache.h
+++ b/include/drm/drm_cache.h
@@ -35,4 +35,13 @@
 
 void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
 
+static inline bool drm_arch_can_wc_memory(void)
+{
+#if defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
+	return false;
+#else
+	return true;
+#endif
+}
+
 #endif


Patches currently in stable-queue which might be from airlied@redhat.com are

queue-4.4/drm-dp-mst-deallocate-payload-on-port-destruction.patch
queue-4.4/drm-fix-missing-reference-counting-decrease.patch
queue-4.4/drm-vmwgfx-respect-nomodeset.patch
queue-4.4/drm-add-drm_fixp_from_fraction-and-drm_fixp2int_ceil.patch
queue-4.4/drm-nouveau-platform-fix-deferred-probe.patch
queue-4.4/drm-nouveau-display-enable-vblank-irqs-after-display-engine-is-on-again.patch
queue-4.4/drm-vmwgfx-fix-an-incorrect-lock-check.patch
queue-4.4/drm-vmwgfx-fix-a-width-pitch-mismatch-on-framebuffer-updates.patch
queue-4.4/drm-dp-mst-move-guid-storage-from-mgr-port-to-only-mst-branch.patch
queue-4.4/drm-add-helper-to-check-for-wc-memory-support.patch
queue-4.4/drm-dp-mst-calculate-mst-pbn-with-31.32-fixed-point.patch
queue-4.4/drm-dp-mst-reverse-order-of-mst-enable-and-clearing-vc-payload-table.patch