Fix for bug 6691452
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>
diff --git a/services/common_time/utils.h b/services/common_time/utils.h
new file mode 100644
index 0000000..d3545c9
--- /dev/null
+++ b/services/common_time/utils.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __UTILS_H__
+#define __UTILS_H__
+
+#include <stdint.h>
+#include <unistd.h>
+
+#include <utils/Timers.h>
+
+namespace android {
+
+class Timeout {
+ public:
+ Timeout() : mSystemEndTime(0) { }
+
+ // Set a timeout which should occur msec milliseconds from now.
+ // Negative values will cancel any current timeout;
+ void setTimeout(int msec);
+
+ // Return the number of milliseconds until the timeout occurs, or -1 if
+ // no timeout is scheduled.
+ int msecTillTimeout(nsecs_t nowTime);
+ int msecTillTimeout() { return msecTillTimeout(systemTime()); }
+
+ private:
+ // The systemTime() at which the timeout will be complete, or 0 if no
+ // timeout is currently scheduled.
+ nsecs_t mSystemEndTime;
+};
+
+} // namespace android
+
+#endif // __UTILS_H__