Re: [PATCH] MIPS: Loongson64: Add read_persistent_clock64()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 





在 2020/11/12 18:04, Jiaxun Yang 写道:
Hi Tiezhu,

在 2020/11/12 16:29, Tiezhu Yang 写道:
Add read_persistent_clock64() to read the time from the battery backed
persistent clock. With this patch, we can fix the wrong time issue due
to the system clock is not consistent with hardware clock after resume
from sleep state S3 (suspend to RAM), at the same time, the system time
can be right instead of "Thu Jan 1 08:00:00 CST 1970" without rtc driver.

start_kernel()
   timekeeping_init()
     read_persistent_wall_and_boot_offset()
       read_persistent_clock64()

timekeeping_resume()
   read_persistent_clock64()

timekeeping_suspend()
   read_persistent_clock64()

It is highly discoraged to do anything with bridgetype, which isn't probed via
devicetree.

Please check if you can deal with that inside RTC framework, or make it as
a part of RTC driver (e.g. set up a callback).

Also you should submit RTC driver at first if you intend to complete LS7A support.

Oops,
Just dig it deeper, I guess simply select RTC_HCTOSYS would solve the issue.
We're trying very hard to decouple all the drivers and conponents,
DeviceTree for all!


Thanks.

- Jiaxun


Signed-off-by: Yinglu Yang <yangyinglu@xxxxxxxxxxx>
Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
---




[Index of Archives]     [LKML Archive]     [Linux ARM Kernel]     [Linux ARM]     [Git]     [Yosemite News]     [Linux SCSI]     [Linux Hams]

  Powered by Linux