Commit 076873e5 authored by Wayne Lin's avatar Wayne Lin Committed by Alex Deucher
Browse files

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



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: default avatarTom Chung <chiahsuan.chung@amd.com>
Link: https://lore.kernel.org/amd-gfx/20250521063934.2111323-1-Wayne.Lin@amd.com/


Signed-off-by: default avatarWayne Lin <Wayne.Lin@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 02fd27e6

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

+3 −0
Original line number Diff line number Diff line
@@ -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 */

drivers/gpu/drm/amd/include/amd_shared.h

+5 −0
Original line number Diff line number Diff line
@@ -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;