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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: facaed62b4 ("drm/nouveau/kms/gv100: initial support")
Cc: <stable@vger.kernel.org> # v4.18+
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Lyude Paul 2020-02-12 18:11:49 -05:00 committed by Ben Skeggs
parent b99ef12b80
commit f287d3d197
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/nouveau/dispnv50/wndw.c
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@ -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;