Commit e062a01e authored by Jon Hunter's avatar Jon Hunter Committed by Ben Skeggs

drm/nouveau/bar/gk20a: Avoid bar teardown during init

Commit bbb163e1 ("drm/nouveau/bar: implement bar1 teardown")
introduced add a teardown helper function for BAR1. During
initialisation of the Nouveau, initially all the teardown helpers are
called once, before calling their init counterparts. For gk20a, after
the BAR1 teardown function is called, the device is hanging during the
initialisation of the FB sub-device. At this point it is unclear why
this is happening and this is still under investigation. However, this
change is preventing Tegra124 devices from booting when Nouveau is
enabled. To allow Tegra124 to boot, remove the teardown helper for

This is based upon a previous patch by Guillaume Tucker but limits
the workaround to only gk20a GPUs.

Fixes: bbb163e1 ("drm/nouveau/bar: implement bar1 teardown")
Reported-by: Guillaume Tucker's avatarGuillaume Tucker <>
Signed-off-by: default avatarJon Hunter <>
Signed-off-by: default avatarBen Skeggs <>
parent b554b12a
......@@ -73,7 +73,8 @@ static int
nvkm_bar_fini(struct nvkm_subdev *subdev, bool suspend)
struct nvkm_bar *bar = nvkm_bar(subdev);
if (bar->func->bar1.fini)
return 0;
......@@ -26,7 +26,6 @@ gk20a_bar_func = {
.dtor = gf100_bar_dtor,
.oneinit = gf100_bar_oneinit,
.bar1.init = gf100_bar_bar1_init,
.bar1.fini = gf100_bar_bar1_fini,
.bar1.wait = gf100_bar_bar1_wait,
.bar1.vmm = gf100_bar_bar1_vmm,
.flush = g84_bar_flush,
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