drm/amd/display: Reduce HPD Detection Interval for IPS

Fix DP Compliance test 4.2.1.3, 4.2.2.8, 4.3.1.12, 4.3.1.13
when IPS enabled.

Original HPD detection interval is set to 5s which violates DP
compliance.
Reduce the interval parameter, such that link training can be
finished within 5 seconds.

Fixes: afca033 ("drm/amd/display: Add periodic detection for IPS")
Reviewed-by: Roman Li <roman.li@amd.com>
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Fangzhi Zuo

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

@@ -35,7 +35,7 @@
 #include "amdgpu_dm_trace.h"
 #include "amdgpu_dm_debugfs.h"
 
-#define HPD_DETECTION_PERIOD_uS 5000000
+#define HPD_DETECTION_PERIOD_uS 2000000
 #define HPD_DETECTION_TIME_uS 100000
 
 void amdgpu_dm_crtc_handle_vblank(struct amdgpu_crtc *acrtc)