drm/amd/display: Conditionally enable 6.75 GBps link rate

[Why]
The 6.75 GBps link rate is part of the new eDP specification
version 1.5 is going to be supported in the future.

Since this standard is very new and there are no existing 6.75 GBps
panels on the market yet, we should put a condition in the driver
on enabling this feature until we can validate it with real hardware.

[How]
- Add boolean flag support_eDP1_5 in struct dc_debug_options.
- Enable the 6.75 link rate in reduce_link_rate(...) only when
  the flag is true.

Reviewed-by: Charlene Liu <[email protected]>
Acked-by: Qingqing Zhuo <[email protected]>
Signed-off-by: Artem Grishin <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 2d2621abf012..1b77d50cfd89 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -874,6 +874,7 @@ struct dc_debug_options {
 	bool temp_mst_deallocation_sequence;
 	bool override_dispclk_programming;
 	bool disable_fpo_optimizations;
+	bool support_eDP1_5;
 };
 
 struct gpu_info_soc_bounding_box_v1_0;