[rtc-linux] rtc regression [463a86304cae ("char/genrtc: x86: remove remnants of asm/rtc.h")]

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

Hi,

commit 463a86304cae ("char/genrtc: x86: remove remnants of asm/rtc.h")
broke rtc for me. Neither hwclock or rtcwake work anymore. This is just
a very standard x86-64 IVB box, and it was reported that machines in
our i915 test farm are having rtc related problems as well.

The first time I run hwclock after rebooting I get this:
 open("/dev/rtc", O_RDONLY)              =3D 3
 ioctl(3, PHN_SET_REGS or RTC_UIE_ON, 0) =3D 0
 select(4, [3], NULL, NULL, {10, 0})     =3D 0 (Timeout)
 ioctl(3, PHN_NOT_OH or RTC_UIE_OFF, 0)  =3D 0
 close(3)                                =3D 0

On all subsequent runs I get this:
 open("/dev/rtc", O_RDONLY)              =3D 3
 ioctl(3, PHN_SET_REGS or RTC_UIE_ON, 0) =3D -1 EINVAL (Invalid argument)
 ioctl(3, RTC_RD_TIME, 0x7ffd76b3ae70)   =3D -1 EINVAL (Invalid argument)
 close(3)                                =3D 0

463a86304cae^ gets me back to working condition:
 open("/dev/rtc", O_RDONLY)              =3D 3
 ioctl(3, PHN_SET_REGS or RTC_UIE_ON, 0) =3D 0
 select(4, [3], NULL, NULL, {10, 0})     =3D 1 (in [3], left {9, 530998})
 ioctl(3, PHN_NOT_OH or RTC_UIE_OFF, 0)  =3D 0
 ioctl(3, RTC_RD_TIME, {tm_sec=3D20, tm_min=3D17, tm_hour=3D15, tm_mday=3D9=
, tm_mon=3D7, tm_year=3D116, ...}) =3D 0
 close(3)                                =3D 0

--=20
Ville Syrj=C3=A4l=C3=A4
Intel OTC

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