[PATCH 1/4] drm/amd/display: limit unbounded requesting to 5k

[Qingqing Zhuo]

From: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>

[WHy & How]
Unbounded requesting is unsupported on pipe split modes
and this change prevents us running into such a situation
with wide modes.

Reviewed-by: Charlene Liu <Charlene.Liu at amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo at amd.com>
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>
Reviewed-by: Harry Wentland <harry.wentland at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c b/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c
index 406492655dee..f22158bb4b13 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c
@@ -1841,7 +1841,8 @@ static int dcn315_populate_dml_pipes_from_context(
 			dc->config.enable_4to1MPC = true;
 			context->bw_ctx.dml.ip.det_buffer_size_kbytes =
 					(max_usable_det / DCN3_15_CRB_SEGMENT_SIZE_KB / 4) * DCN3_15_CRB_SEGMENT_SIZE_KB;
-		} else if (!is_dual_plane(pipe->plane_state->format)) {
+		} else if (!is_dual_plane(pipe->plane_state->format) && pipe->plane_state->src_rect.width <= 5120) {
+			/* Limit to 5k max to avoid forced pipe split when there is not enough detile for swath */
 			context->bw_ctx.dml.ip.det_buffer_size_kbytes = 192;
 			pipes[0].pipe.src.unbounded_req_mode = true;
 		}
-- 
2.25.1