drm/etnaviv: ignore VG GPUs with FE2.0

Ignore GPUs with a 2.0 front end.  These have a different register
layout for the front end, which provokes imprecise aborts from the
register accesses in the 'gpu' debugfs file.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index e0e68dd7565d..a9530f59e6fe 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -515,6 +515,14 @@ int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
                 goto fail;
         }
 
+        /* Exclude VG cores with FE2.0 */
+        if (gpu->identity.features & chipFeatures_PIPE_VG &&
+            gpu->identity.features & chipFeatures_FE20) {
+                dev_info(gpu->dev, "Ignoring GPU with VG and FE2.0\n");
+                ret = -ENXIO;
+                goto fail;
+        }
+
         ret = etnaviv_hw_reset(gpu);
         if (ret)
                 goto fail;