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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Ben Skeggs <bskeggs@redhat.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.2 063/137] drm/nouveau/kms/tu102-: disable input lut when input is already FP16
Date:   Sun,  6 Oct 2019 19:20:47 +0200
Message-Id: <20191006171213.981899559@linuxfoundation.org>
In-Reply-To: <20191006171209.403038733@linuxfoundation.org>
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From: Ben Skeggs <bskeggs@redhat.com>

[ Upstream commit 1e339ab2ac3c769c1b06b9fb7d532f8495ebc56d ]

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: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/nouveau/dispnv50/wndw.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/wndw.c b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
index 283ff690350ea..50303ec194bbc 100644
--- 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_wndw *wndw,
 		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;
 	}
-- 
2.20.1