From: Mathieu Malaterre <malat@debian.org>
Date: Tue, 24 Apr 2018 21:55:11 +0200
Subject: drm/radeon: Change the default to PCI on PowerPC
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Git-commit: 037d1a66ae640ca2723f47c0115ffa9e603699b3
Patch-mainline: v4.18-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

AGP mode is unstable on PowerPC. Symptoms are generally of the form:

[ 1228.795711] radeon 0000:00:10.0: ring 0 stalled for more than 10240msec

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/radeon/radeon_drv.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -168,7 +168,12 @@ int radeon_no_wb;
 int radeon_modeset = -1;
 int radeon_dynclks = -1;
 int radeon_r4xx_atom = 0;
+#ifdef __powerpc__
+/* Default to PCI on PowerPC (fdo #95017) */
+int radeon_agpmode = -1;
+#else
 int radeon_agpmode = 0;
+#endif
 int radeon_vram_limit = 0;
 int radeon_gart_size = -1; /* auto */
 int radeon_benchmarking = 0;