libdrm: bbappend to patch xf86drm.h with arm support

Add libdrm bbappend to patch xf86drm.h with arm support
This fixes hangs from stopping vivante sample applications run with X11
This includes the fix for if "lock" is 0, the macro should return failure.

Signed-off-by: Evan Kotara <evan.kotara@freescale.com>

imx/meta-fsl-arm/recipes-graphics/drm/libdrm/mx6/drm-update-arm.patch

@@ -0,0 +1,32 @@
+Add ARM support into xf86arm.h.  This provides support for Xorg interface.
+Without this the vivante samples will hang during close requiring a reboot
+
+Signed-off-by: Lauren Post <lauren.post@freescale.com>
+Signed-off-by: Evan Kotara <evan.kotara@freescale.com>
+
+diff --git a/xf86drm.h b/xf86drm.h
+--- a/xf86drm.h
++++ b/xf86drm.h
+@@ -455,6 +455,22 @@ do {	register unsigned int __old __asm("o0");		\
+ 		: "cr0", "memory");			\
+ 	} while (0)
+ 
++#elif defined(__arm__)
++       #undef DRM_DEV_MODE
++       #define DRM_DEV_MODE     (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
++
++       #define DRM_CAS(lock,old,new,__ret)             \
++       do {                                            \
++               __asm__ __volatile__ (                  \
++                       "1: ldrex %0, [%1]\n"           \
++                       "   teq %0, %2\n"               \
++                       "   strexeq %0, %3, [%1]\n"     \
++                       "   movne   %0, #1\n"           \
++               : "=&r" (__ret)                         \
++               : "r" (lock), "r" (old), "r" (new)      \
++               : "cc","memory");                       \
++       } while (0)
++
+ #endif /* architecture */
+ #endif /* __GNUC__ >= 2 */
+ 

imx/meta-fsl-arm/recipes-graphics/drm/libdrm_2.4.46.bbappend

@@ -0,0 +1,6 @@
+# Freescale imx update xf86drm.h
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+
+PACKAGE_ARCH_mx6 = "${MACHINE_ARCH}"
+
+SRC_URI_append_mx6 = "file://drm-update-arm.patch"