[PATCH 51/66] drm/amd/display: Cap DML2.1 vmin ODM combine at 2:1 for eDP

[Chenyu Chen <chen-yu.chen@amd.com>]

From: Leo Chen <leo.chen@amd.com>

[Why]
Currently in DML2.1, by design, the DPMs are unpinned when optimizing
for Vmin PMO. This leads to an issue on DCN42 on specific panels (e.g. 4k144 eDP)
where ODM4:1 is applied unexpectedly, which affects the urgent bandwidth required,
raises DCFCLK to DPM1, and thus blocks Z8.

[How]
Clamp the ODM combine limit to 2 for eDP streams directly in
pmo_dcn4_fams2_optimize_for_vmin()

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Leo Chen <leo.chen@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
---
 .../dml2_0/dml21/src/dml2_pmo/dml2_pmo_dcn4_fams2.c   | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_pmo/dml2_pmo_dcn4_fams2.c b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_pmo/dml2_pmo_dcn4_fams2.c
index 7ae02eccd598..de078ccd91a2 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_pmo/dml2_pmo_dcn4_fams2.c
+++ b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_pmo/dml2_pmo_dcn4_fams2.c
@@ -887,6 +887,7 @@ bool pmo_dcn4_fams2_optimize_for_vmin(struct dml2_pmo_optimize_for_vmin_in_out *
 	const struct dml2_core_mode_support_result *mode_support_result =
 			&in_out->base_display_config->mode_support_result;
 	unsigned int odms_used;
+	int odm_combine_limit;
 	struct dml2_stream_parameters *stream_descriptor;
 	bool optimizable = false;
 
@@ -901,8 +902,16 @@ bool pmo_dcn4_fams2_optimize_for_vmin(struct dml2_pmo_optimize_for_vmin_in_out *
 			in_out->base_display_config->stage4.unoptimizable_streams[stream_index])
 		return false;
 
+	/*
+	 * Enforce a max cap on ODM combine factor of 2:1 for eDP stream
+	 */
+	odm_combine_limit = in_out->instance->odm_combine_limit;
+	if (display_config->stream_descriptors[stream_index].output.output_encoder == dml2_edp &&
+			odm_combine_limit > 2)
+		odm_combine_limit = 2;
+
 	odms_used = mode_support_result->cfg_support_info.stream_support_info[stream_index].odms_used;
-	if ((int)odms_used >= in_out->instance->odm_combine_limit)
+	if ((int)odms_used >= odm_combine_limit)
 		return false;
 
 	memcpy(in_out->optimized_display_config,
-- 
2.43.0