[PATCH 6/9] drm/amd/display: Add check for validating unsupported ODM plus MPO case

[Aurabindo Pillai]

From: Jaehyun Chung <jaehyum.chung at amd.com>

[Why]
We do not currently support ODM plus MPO on only one side of the
screen. This unsupported case causes validation calculations to
divide by zero due to invalid viewport values.

[How]
Add stopgap for the validation of ODM plus MPO on one side of
screen case.

Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
Signed-off-by: Jaehyun Chung <jaehyun.chung at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 5 +++++
 1 file changed, 5 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 1596f6b7fed7..f1b8c1292035 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -1051,6 +1051,11 @@ bool resource_build_scaling_params(struct pipe_ctx *pipe_ctx)
 	/* depends on scaling ratios and recout, does not calculate offset yet */
 	calculate_viewport_size(pipe_ctx);
 
+	/* Stopgap for validation of ODM + MPO on one side of screen case */
+	if (pipe_ctx->plane_res.scl_data.viewport.height < 1 ||
+			pipe_ctx->plane_res.scl_data.viewport.width < 1)
+		return false;
+
 	/*
 	 * LB calculations depend on vp size, h/v_active and scaling ratios
 	 * Setting line buffer pixel depth to 24bpp yields banding
-- 
2.32.0