FAILED: patch "[PATCH] drm/nouveau/kms/gv100-: Re-set LUT after clearing for" failed to apply to 4.19-stable tree

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 <[email protected]>.

thanks,

greg k-h

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

From f287d3d19769b1d22cba4e51fa0487f2697713c9 Mon Sep 17 00:00:00 2001
From: Lyude Paul <[email protected]>
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.

index 890315291b01..bb737f9281e6 100644
@@ -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;

We don't have 88b703527ba7 ("drm/nouveau/kms/gf119-: add ctm property support") in 4.19. I've fixed it and queued up.

Thanks,
Sasha