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drm/amd/display: Add a new dcdebugmask to allow skip detection LT

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Under specific embedded scenarios, we might still use DP interface
rather than eDP interface. Under such case, detection link training
is unnecessary.

Add a new dcdebugmask value that can be used to skip the detection LT

Reviewed-by: Tom Chung <chiahsuan.chung@amd.com>
Link: https://lore.kernel.org/amd-gfx/20250521063934.2111323-1-Wayne.Lin@amd.com/
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wayne Lin 2025-05-20 09:34:42 +08:00 committed by Alex Deucher
parent 02fd27e6cf
commit 076873e5b3
2 changed files with 8 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
View File

@ -2020,6 +2020,9 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
if (amdgpu_dc_debug_mask & DC_HDCP_LC_ENABLE_SW_FALLBACK)
adev->dm.dc->debug.hdcp_lc_enable_sw_fallback = true;
if (amdgpu_dc_debug_mask & DC_SKIP_DETECTION_LT)
adev->dm.dc->debug.skip_detection_link_training = true;
adev->dm.dc->debug.visual_confirm = amdgpu_dc_visual_confirm;
/* TODO: Remove after DP2 receiver gets proper support of Cable ID feature */

5
drivers/gpu/drm/amd/include/amd_shared.h
View File

@ -370,6 +370,11 @@ enum DC_DEBUG_MASK {
* path failure, retry using legacy SW path.
*/
DC_HDCP_LC_ENABLE_SW_FALLBACK = 0x100000,
/**
* @DC_SKIP_DETECTION_LT: If set, skip detection link training
*/
DC_SKIP_DETECTION_LT = 0x200000,
};
enum amd_dpm_forced_level;