[PATCH 11/33] drm/amd/display: Add DC debug option to force LTTPR mode

[brichang]

From: Michael Strauss <michael.strauss at amd.com>

[WHY]
Useful for external teams debugging LTTPR issues

Reviewed-by: George Shen <George.Shen at amd.com>
Acked-by: Brian Chang <Brian.Chang at amd.com>
Signed-off-by: Michael Strauss <michael.strauss at amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 4 ++++
 drivers/gpu/drm/amd/display/dc/dc.h              | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 8617de559174..7e97265b76e8 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -5032,6 +5032,10 @@ static void determine_lttpr_mode(struct dc_link *link)
 	bool vbios_lttpr_enable = link->dc->caps.vbios_lttpr_enable;
 	bool vbios_lttpr_interop = link->dc->caps.vbios_lttpr_aware;
 
+	if (link->ctx->dc->debug.lttpr_mode_override != 0) {
+		link->lttpr_mode = link->ctx->dc->debug.lttpr_mode_override;
+		return;
+	}
 
 	if ((link->dc->config.allow_lttpr_non_transparent_mode.bits.DP2_0 &&
 			link->dpcd_caps.channel_coding_cap.bits.DP_128b_132b_SUPPORTED)) {
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 2362d5ee2401..473e6a0c3310 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -846,6 +846,7 @@ struct dc_debug_options {
 	bool exit_idle_opt_for_cursor_updates;
 	bool enable_single_display_2to1_odm_policy;
 	bool enable_dp_dig_pixel_rate_div_policy;
+	enum lttpr_mode lttpr_mode_override;
 };
 
 struct gpu_info_soc_bounding_box_v1_0;
-- 
2.25.1