From: Ben Skeggs <bskeggs@redhat.com>
Date: Wed, 29 May 2019 15:44:57 +1000
Subject: drm/nouveau/kms/tu102-: disable input lut when input is already FP16
Git-commit: 1e339ab2ac3c769c1b06b9fb7d532f8495ebc56d
Patch-mainline: 5.4-rc1
References: bnc#1151927 5.3.5

On Turing, an input LUT is required to transform inputs in fixed-point
formats to FP16 for the internal display pipe.  We provide an identity
mapping whenever a window is enabled for this reason.

HW has error checks to ensure when the input is already FP16, that the
input LUT is also disabled.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/gpu/drm/nouveau/dispnv50/wndw.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/nouveau/dispnv50/wndw.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
@@ -320,7 +320,9 @@ nv50_wndw_atomic_check_lut(struct nv50_w
 		asyh->wndw.olut &= ~BIT(wndw->id);
 	}
 
-	if (!ilut && wndw->func->ilut_identity) {
+	if (!ilut && wndw->func->ilut_identity &&
+	    asyw->state.fb->format->format != DRM_FORMAT_XBGR16161616F &&
+	    asyw->state.fb->format->format != DRM_FORMAT_ABGR16161616F) {
 		static struct drm_property_blob dummy = {};
 		ilut = &dummy;
 	}