drm/amd/display: fix crash on setmode when mode is close to bw limit

[why]
during It's possible to call dcn_validate_bandwidth with no plane.
In that case, as we are only intersted in if output timing is supported or not,
even if we cannot support native resolution, we still want to support lower
resolution if it is valid

[how]
if there exist no surface, make viewport/rec_out size at max 1080p. It is
already known that 1080p x 6(max # of pipes) is supported, so if we fail
validation, it is because of the stream

Signed-off-by: Su Sung Chung <[email protected]>
Reviewed-by: Dmytro Laktyushkin <[email protected]>
Acked-by: Leo Li <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
index 0a336c80c7bb..5c1e0adb142b 100644
--- a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
+++ b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
@@ -872,8 +872,19 @@ bool dcn_validate_bandwidth(
 			v->lb_bit_per_pixel[input_idx] = 30;
 			v->viewport_width[input_idx] = pipe->stream->timing.h_addressable;
 			v->viewport_height[input_idx] = pipe->stream->timing.v_addressable;
-			v->scaler_rec_out_width[input_idx] = pipe->stream->timing.h_addressable;
-			v->scaler_recout_height[input_idx] = pipe->stream->timing.v_addressable;
+			/*
+			 * for cases where we have no plane, we want to validate up to 1080p
+			 * source size because here we are only interested in if the output
+			 * timing is supported or not. if we cannot support native resolution
+			 * of the high res display, we still want to support lower res up scale
+			 * to native
+			 */
+			if (v->viewport_width[input_idx] > 1920)
+				v->viewport_width[input_idx] = 1920;
+			if (v->viewport_height[input_idx] > 1080)
+				v->viewport_height[input_idx] = 1080;
+			v->scaler_rec_out_width[input_idx] = v->viewport_width[input_idx];
+			v->scaler_recout_height[input_idx] = v->viewport_height[input_idx];
 			v->override_hta_ps[input_idx] = 1;
 			v->override_vta_ps[input_idx] = 1;
 			v->override_hta_pschroma[input_idx] = 1;