The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f287d3d19769b1d22cba4e51fa0487f2697713c9 Mon Sep 17 00:00:00 2001

From: Lyude Paul lyude@redhat.com Date: Wed, 12 Feb 2020 18:11:49 -0500 Subject: [PATCH] drm/nouveau/kms/gv100-: Re-set LUT after clearing for modesets

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

diff --git a/drivers/gpu/drm/nouveau/dispnv50/wndw.c b/drivers/gpu/drm/nouveau/dispnv50/wndw.c index 890315291b01..bb737f9281e6 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/wndw.c +++ b/drivers/gpu/drm/nouveau/dispnv50/wndw.c @@ -458,6 +458,8 @@ nv50_wndw_atomic_check(struct drm_plane *plane, struct drm_plane_state *state) 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; asyw->clr.csc = armw->csc.valid; if (wndw->func->image_clr) asyw->clr.image = armw->image.handle[0] != 0;