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Date:   Tue, 22 Dec 2020 21:13:13 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>,
        Hersen Wu <hersenxs.wu@....com>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.10 024/217] drm/amd/display: fix recout calculation for left side clip

From: Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>

[ Upstream commit 84aef2ab0977199784671295a07043191233d7c7 ]

Recout calculation does not corrrectly handle plane
clip rect that extends beyond the left most border
of stream source rect. This change adds handling by
truncating the invisible clip rect.

Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>
Reviewed-by: Hersen Wu <hersenxs.wu@....com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index 59d48cf819ea8..6d606cc32b09e 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -796,6 +796,8 @@ static void calculate_recout(struct pipe_ctx *pipe_ctx)
 	} else
 		data->recout.x = 0;
 
+	if (stream->src.x > surf_clip.x)
+		surf_clip.width -= stream->src.x - surf_clip.x;
 	data->recout.width = surf_clip.width * stream->dst.width / stream->src.width;
 	if (data->recout.width + data->recout.x > stream->dst.x + stream->dst.width)
 		data->recout.width = stream->dst.x + stream->dst.width - data->recout.x;
@@ -804,6 +806,8 @@ static void calculate_recout(struct pipe_ctx *pipe_ctx)
 	if (stream->src.y < surf_clip.y)
 		data->recout.y += (surf_clip.y - stream->src.y) * stream->dst.height
 						/ stream->src.height;
+	else if (stream->src.y > surf_clip.y)
+		surf_clip.height -= stream->src.y - surf_clip.y;
 
 	data->recout.height = surf_clip.height * stream->dst.height / stream->src.height;
 	if (data->recout.height + data->recout.y > stream->dst.y + stream->dst.height)
-- 
2.27.0

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