diff options
| author | Jimmy Kizito <Jimmy.Kizito@amd.com> | 2021-08-25 21:26:33 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-10-06 15:52:43 -0400 |
| commit | 6aa8d42c6674461720bb826a5f1cdcdfe85253f1 (patch) | |
| tree | a4c631dcdeb26860cb610c65767041e81a2c0ec2 /drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | |
| parent | 8cf5ed4a158e08f2b20c3a91bf4b72f8a9938ace (diff) | |
drm/amd/display: Add debug flags for USB4 DP link training.
[Why & How]
Additional debug flags that can be useful for testing USB4 DP
link training.
Add flags:
- 0x2 : Forces USB4 DP link to non-LTTPR mode
- 0x4 : Extends status read intervals to about 60s.
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Wayne Lin <Wayne.Lin@amd.com>
Acked-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 6 |
1 files changed, 6 insertions, 0 deletions
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 56aaab22fa42..54662d74c65a 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 @@ -4527,6 +4527,12 @@ bool dp_retrieve_lttpr_cap(struct dc_link *link) else link->lttpr_mode = LTTPR_MODE_NON_TRANSPARENT; } +#if defined(CONFIG_DRM_AMD_DC_DCN) + /* Check DP tunnel LTTPR mode debug option. */ + if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA && + link->dc->debug.dpia_debug.bits.force_non_lttpr) + link->lttpr_mode = LTTPR_MODE_NON_LTTPR; +#endif if (link->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT || link->lttpr_mode == LTTPR_MODE_TRANSPARENT) { /* By reading LTTPR capability, RX assumes that we will enable |