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Subject[PATCH 4/4] drm/nouveau: dispnv50: Report possible_crtcs incorrectly on mstos, for now
Date
This commit is seperate from the previous one to make it easier to
revert in the future. Basically, while working on making MSTOs per-head
as opposed to per-head-per-connector I discovered these lovely issues:

https://gitlab.freedesktop.org/xorg/xserver/merge_requests/277
https://gitlab.gnome.org/GNOME/mutter/issues/759

Note as well that Intel already has a temporary workaround for this in
their kernel driver. So, unfortunately we need to follow suit to avoid
causing a regression in userspace. Once these issues get fixed, this
commit should be reverted.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/nouveau/dispnv50/disp.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index d23ac13763b5..f5ad20af0dd5 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -2366,6 +2366,18 @@ nv50_display_create(struct drm_device *dev)
head->msto = NULL;
goto out;
}
+
+ /*
+ * FIXME: This is a hack to workaround the following
+ * issues:
+ *
+ * https://gitlab.gnome.org/GNOME/mutter/issues/759
+ * https://gitlab.freedesktop.org/xorg/xserver/merge_requests/277
+ *
+ * Once these issues are closed, this should be
+ * removed
+ */
+ head->msto->encoder.possible_crtcs = crtcs;
}
}

--
2.21.0
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