I am trying to check the behavior of the FTM timer in LS1046A (LS1046ARDB + LSDK-1909 update 311219) by the "rtc_chk.c" test program. During this check I observed deadlock on reading /dev/rtc1 after alarm timer interrupt.
Applying the patch "0001-Modify-interrupt-handler.patch" fixes this problem.
Is this a known issue?
Could you review the patch to see if the workaround is appropriate please?
"rtc_chk.c" and "0001-Modify-interrupt-handler.patch" are contained in the attached tgz file.
The expected result of this test program is:
root@localhost:~# ./rtc_chk Alarm test start. * Current RTC: 2020/3/16 04:16:33 * Alarm timer is set to '04:16:38' * Set alarm in 5s... Get alarm !! root@localhost:~#
We can get this result when the patch is applied to the linux kernel source.
Without the patch, we will never see the message "* Set alarm in 5s... Get alarm !!" and following command prompt.
The Section 7.2.19 from NXP LSDK 1909 User Guide contains documentation for FTM timer testing:
Is there problem for FTM Alarm testing using this Section.
Have a great day,
Pavel Chubakov
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Hello PavelChubakov,
Thank you for the comment.
It seems the FTM alarm testing works fine excepting a register dump and a call trace are provided as you can see in the attached log file.
However, the test program does not work as expected unless the patch is applied.
Best regards,
Ando