c7f57c6f92
Hand merge from ics-aah > Fix for bug 6691452 : DO NOT MERGE > > As it so happens, there seem to be panels out there who disapprove of > sudden changes in their HDMI clock rate. In particular, Sony LCD > panels made from around 2010-2011 (including the Sony GTV panel) seem > to dislike this behavior. When exposed to a large jump in the clock > rate (say from -100pmm to +100ppm in about 30mSec), they seem to > panic, blank their audio and video, and then resync. The whole > panic process takes about 2 seconds. > > The HDMI spec says that its clock jitter requirements are defined by > their differential signalling eye diagram requirements relative to an > "Ideal Recovery Clock" (see section 4.2.3.1 of the HDMI 1.3a spec). > Basically, if you pass the eye diagram tests, you pass the clock > jitter requirements. We have determined in lab that even being > extremely aggressive in our VCXO rate changes does not come even close > to violating the HDMI eye diagrams. Its just this era of Sony panels > which seem to be upset by this behavior. > > One way or the other, experiments which the GTV devices have seemed to > indicate that a full range sweep of the VCXO done in 10mSec steps over > anything faster than 190mSec can cause trouble. Adding a healthy > degree of margin to this finding, the fix is to limit the rate of VCXO > control change such that it never goes at a rate faster than > FullRange/300mSec. > > Change flagged as do not merge due to the code structure changes to master. > This will need to be merged by hand. > > Signed-off-by: John Grossman <johngro@google.com> > Change-Id: Ibfd361fe1cc2cbd4909489e3317fb12e005c6a75 Change-Id: If62f791c826f1145262a6b546b1dc1f9776c37d8 Signed-off-by: John Grossman <johngro@google.com>
36 lines
714 B
Makefile
36 lines
714 B
Makefile
LOCAL_PATH:= $(call my-dir)
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#
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# common_time_service
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#
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include $(CLEAR_VARS)
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LOCAL_SRC_FILES := \
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common_clock_service.cpp \
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common_time_config_service.cpp \
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common_time_server.cpp \
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common_time_server_api.cpp \
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common_time_server_packets.cpp \
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clock_recovery.cpp \
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common_clock.cpp \
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main.cpp \
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utils.cpp
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# Uncomment to enable vesbose logging and debug service.
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#TIME_SERVICE_DEBUG=true
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ifeq ($(TIME_SERVICE_DEBUG), true)
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LOCAL_SRC_FILES += diag_thread.cpp
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LOCAL_CFLAGS += -DTIME_SERVICE_DEBUG
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endif
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LOCAL_SHARED_LIBRARIES := \
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libbinder \
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libcommon_time_client \
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libutils
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LOCAL_MODULE_TAGS := optional
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LOCAL_MODULE := common_time
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include $(BUILD_EXECUTABLE)
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