[Bug 108625] AMDGPU - Can't even get Xorg to start - Kernel driver hangs with ring buffer timeout on ARM64 - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 108625] AMDGPU - Can't even get Xorg to start - Kernel driver hangs  with ring buffer timeout on ARM64
Date: Mon, 19 Nov 2018 13:00:31 +0000	[thread overview]
Message-ID: <bug-108625-502-dQ96xUoZ58@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-108625-502@http.bugs.freedesktop.org/>


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https://bugs.freedesktop.org/show_bug.cgi?id=108625

--- Comment #15 from Carsten Haitzler <raster@rasterman.com> ---
And lo and behold:

--- ./include/drm/drm_cache.h~  2018-08-12 21:41:04.000000000 +0100
+++ ./include/drm/drm_cache.h   2018-11-16 11:06:16.976842816 +0000
@@ -48,7 +48,7 @@
 #elif defined(CONFIG_MIPS) && defined(CONFIG_CPU_LOONGSON3)
        return false;
 #else
-       return true;
+       return false;
 #endif
 }

Makes it work. Of course this isn't a brilliant patch, but indeed there is
something up with the way write combined memory is handled on ARM here. but
disabling WC for all ARM DRM devices might be too much of a sledgehammer... I'm
going to look into a less sledge-hammer solution that might make this work more
universally. I'll get back to you on that.

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