On Thu, Jan 04, 2018 at 11:29:09AM +0000, Jon Hunter wrote:
Commit bbb163e18960 ("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 gk20a.
This is based upon a previous patch by Guillaume Tucker but limits the workaround to only gk20a GPUs.
Fixes: bbb163e18960 ("drm/nouveau/bar: implement bar1 teardown") Reported-by: Guillaume Tucker guillaume.tucker@collabora.com Signed-off-by: Jon Hunter jonathanh@nvidia.com
I am not happy that we do not yet fully understand the cause of the hang, but I am talking with a few people at NVIDIA about this and have a few things to look into. However, given that we are close to v4.15 being released and I am not sure we will have a proper fix in place before, I think it is best to workaround this for now.
drivers/gpu/drm/nouveau/nvkm/subdev/bar/base.c | 3 ++- drivers/gpu/drm/nouveau/nvkm/subdev/bar/gk20a.c | 1 - 2 files changed, 2 insertions(+), 2 deletions(-)
Acked-by: Thierry Reding treding@nvidia.com