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>
50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "utils.h"
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namespace android {
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void Timeout::setTimeout(int msec) {
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if (msec < 0) {
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mSystemEndTime = 0;
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return;
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}
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mSystemEndTime = systemTime() + (static_cast<nsecs_t>(msec) * 1000000);
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}
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int Timeout::msecTillTimeout(nsecs_t nowTime) {
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if (!mSystemEndTime) {
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return -1;
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}
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if (mSystemEndTime < nowTime) {
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return 0;
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}
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nsecs_t delta = mSystemEndTime - nowTime;
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delta += 999999;
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delta /= 1000000;
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if (delta > 0x7FFFFFFF) {
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return 0x7FFFFFFF;
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}
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return static_cast<int>(delta);
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}
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} // namespace android
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