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

[brichang]

From: Michael Strauss <michael.stra...@amd.com>

[WHY]
Useful for external teams debugging LTTPR issues

Reviewed-by: George Shen <george.s...@amd.com>
Acked-by: Brian Chang <brian.ch...@amd.com>
Signed-off-by: Michael Strauss <michael.stra...@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