From: Lyude Paul <lyude@redhat.com>
Date: Wed, 12 Feb 2020 18:11:49 -0500
Subject: drm/nouveau/kms/gv100-: Re-set LUT after clearing for modesets
Git-commit: f287d3d19769b1d22cba4e51fa0487f2697713c9
Patch-mainline: v5.6-rc3
References: git-fixes

While certain modeset operations on gv100+ need us to temporarily
disable the LUT, we make the mistake of sometimes neglecting to
reprogram the LUT after such modesets. In particular, moving a head from
one encoder to another seems to trigger this quite often. GV100+ is very
picky about having a LUT in most scenarios, so this causes the display
engine to hang with the following error code:

disp: chid 1 stat 00005080 reason 5 [INVALID_STATE] mthd 0200 data
00000001 code 0000002d)

So, fix this by always re-programming the LUT if we're clearing it in a
state where the wndw is still visible, and has a XLUT handle programmed.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Fixes: facaed62b4cb ("drm/nouveau/kms/gv100: initial support")
Cc: <stable@vger.kernel.org> # v4.18+
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/nouveau/dispnv50/wndw.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/nouveau/dispnv50/wndw.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
@@ -408,6 +408,8 @@ nv50_wndw_atomic_check(struct drm_plane
 		asyw->clr.ntfy = armw->ntfy.handle != 0;
 		asyw->clr.sema = armw->sema.handle != 0;
 		asyw->clr.xlut = armw->xlut.handle != 0;
+		if (asyw->clr.xlut && asyw->visible)
+			asyw->set.xlut = asyw->xlut.handle != 0;
 		if (wndw->func->image_clr)
 			asyw->clr.image = armw->image.handle[0] != 0;
 	}