android 8.1 蓝牙打不开之CLOCK_BOOTTIME_ALARM问题

最近在配置android8.1系统的蓝牙时，按照之前android6.0的方式配置，完成后蓝牙打开不了，查看发现如下log:

07-03 17:11:36.054 1482 1498 E bt_btif_config_transcode: btif_config_transcode unable to load XML file '/data/misc/bluedroid/bt_config.xml': 3
07-03 17:11:36.054 1482 1498 E bt_btif_config: init unable to transcode legacy file; creating empty config.
07-03 17:11:36.054 1482 1498 E bt_osi_alarm: timer_create_internal unable to create timer with clock 9: Unknown error 524
07-03 17:11:36.054 1482 1498 E bt_osi_alarm: The kernel might not have support for timer_create(CLOCK_BOOTTIME_ALARM): https://lwn.net/Articles/429925/
07-03 17:11:36.054 1482 1498 E bt_osi_alarm: See following patches: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/?qt=grep&q=CLOCK_BOOTTIME_ALARM
07-03 17:11:36.055 1482 1498 F : [0703/171136:FATAL:alarm.cc(178)] Check failed: false.
07-03 17:11:36.055 1482 1498 F libc : Fatal signal 6 (SIGABRT), code -6 in tid 1498 (stack_manager), pid 1482 (droid.bluetooth)
07-03 17:11:36.107 1503 1503 I crash_dump32: obtaining output fd from tombstoned, type: kDebuggerdTombstone
07-03 17:11:36.107 376 376 I /system/bin/tombstoned: received crash request for pid 1482
07-03 17:11:36.108 1503 1503 I crash_dump32: performing dump of process 1482 (target tid = 1498)
07-03 17:11:36.108 1503 1503 F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
07-03 17:11:36.108 1503 1503 F DEBUG : Build fingerprint: 'rockchip/rk3288/rk3288:8.1.0/OPM8.190305.001/105210:userdebug/test-keys'
07-03 17:11:36.108 1503 1503 F DEBUG : Revision: '0'
07-03 17:11:36.108 1503 1503 F DEBUG : ABI: 'arm'
07-03 17:11:36.108 1503 1503 F DEBUG : pid: 1482, tid: 1498, name: stack_manager >>> com.android.bluetooth <<<
07-03 17:11:36.108 1503 1503 F DEBUG : signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
07-03 17:11:36.114 1503 1503 F DEBUG : Abort message: '[0703/171136:FATAL:alarm.cc(178)] Check failed: false.
07-03 17:11:36.114 1503 1503 F DEBUG : '
07-03 17:11:36.114 1503 1503 F DEBUG : r0 00000000 r1 000005da r2 00000006 r3 00000008
07-03 17:11:36.114 1503 1503 F DEBUG : r4 000005ca r5 000005da r6 9679dc54 r7 0000010c
07-03 17:11:36.114 1503 1503 F DEBUG : r8 00000000 r9 9679e3d8 sl 9679dc8d fp 9679dc8c
07-03 17:11:36.114 1503 1503 F DEBUG : ip 00000000 sp 9679dc40 lr b31fba2f pc b31f543c cpsr 20010030
07-03 17:11:36.193 1503 1503 F DEBUG :
07-03 17:11:36.193 1503 1503 F DEBUG : backtrace:
07-03 17:11:36.194 1503 1503 F DEBUG : #00 pc 0001a43c /system/lib/libc.so (abort+63)
07-03 17:11:36.194 1503 1503 F DEBUG : #01 pc 00082d0b /system/lib/libchrome.so (base::debug::BreakDebugger()+10)
07-03 17:11:36.194 1503 1503 F DEBUG : #02 pc 00090aa1 /system/lib/libchrome.so (logging::LogMessage::~LogMessage()+304)
07-03 17:11:36.194 1503 1503 F DEBUG : #03 pc 0013715f /system/lib/hw/bluetooth.default.so (alarm_new_internal(char const*, bool)+462)
07-03 17:11:36.194 1503 1503 F DEBUG : #04 pc 00066775 /system/lib/hw/bluetooth.default.so (init()+720)
07-03 17:11:36.194 1503 1503 F DEBUG : #05 pc 00136567 /system/lib/hw/bluetooth.default.so (module_init(module_t const*)+70)
07-03 17:11:36.194 1503 1503 F DEBUG : #06 pc 000a0f85 /system/lib/hw/bluetooth.default.so (event_init_stack(void*)+80)
07-03 17:11:36.194 1503 1503 F DEBUG : #07 pc 0013dc83 /system/lib/hw/bluetooth.default.so (work_queue_read_cb(void*)+50)
07-03 17:11:36.194 1503 1503 F DEBUG : #08 pc 0013c649 /system/lib/hw/bluetooth.default.so (run_reactor(reactor_t*, int)+216)
07-03 17:11:36.194 1503 1503 F DEBUG : #09 pc 0013c545 /system/lib/hw/bluetooth.default.so (reactor_start(reactor_t*)+44)
07-03 17:11:36.194 1503 1503 F DEBUG : #10 pc 0013d83d /system/lib/hw/bluetooth.default.so (run_thread(void*)+136)
07-03 17:11:36.194 1503 1503 F DEBUG : #11 pc 00047d3f /system/lib/libc.so (__pthread_start(void*)+22)
07-03 17:11:36.194 1503 1503 F DEBUG : #12 pc 0001b029 /system/lib/libc.so (__start_thread+32)

log中的红色部分提示内核不支持CLOCK_BOOTTIME_ALARM,后面参考了其他原厂项目配置发现有在wifi和蓝牙的部分dts中添加了 clocks = <&rk808 1>;
clock-names = "ext_clock";

这样的配置，有些是

clocks = <&hym8563>;
clock-names = "ext_clock";

hym8563和rk808 都是rtc的配置，而我们配置的rtc为pcf8583，由安卓6.0上面修改过来的，应该没有支持CLOCK_BOOTTIME_ALARM.于是查找网上CLOCK_BOOTTIME_ALARM。发现CLOCK_BOOTTIME_ALARM是用于机器休眠时的时间处理，由于我们的机器不需要休眠，后面找到可以在system\bt\osi\src\alarm.cc中进行屏蔽。

--- a/system/bt/osi/src/alarm.cc
+++ b/system/bt/osi/src/alarm.cc
@@ -115,11 +115,11 @@ struct alarm_t {
int64_t TIMER_INTERVAL_FOR_WAKELOCK_IN_MS = 3000;
static const clockid_t CLOCK_ID = CLOCK_BOOTTIME;

-#if (KERNEL_MISSING_CLOCK_BOOTTIME_ALARM == TRUE)
+//#if (KERNEL_MISSING_CLOCK_BOOTTIME_ALARM == TRUE)
static const clockid_t CLOCK_ID_ALARM = CLOCK_BOOTTIME;
-#else
-static const clockid_t CLOCK_ID_ALARM = CLOCK_BOOTTIME_ALARM;
-#endif
+//#else
+//static const clockid_t CLOCK_ID_ALARM = CLOCK_BOOTTIME_ALARM;
+//#endif

修改上述以后，蓝牙可以正常打开了。但是如果要保留CLOCK_BOOTTIME_ALARM功能支持，可能要对rtc驱动进行修改。

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