arm: imx: initialize the system counter earlier on i.MX7

imx_gpcv2_init() calls udelay(), which through schedule() reaches
cyclic_run(). Since commit 9c1b13b3fd27 ("cyclic: reduce get_timer_us()
calls inside hlist_for_each_entry_safe()") get_timer_us() is called even
when no cyclic function is registered, so tick_to_time_us() divides by a
still zero CNTFRQ and __div0() hangs the board before the console is up.
The requested delay was a no-op as well, since us_to_tick() reads a CNTFRQ
of zero.

Initialize the system counter before imx_gpcv2_init(), and move the
"already initialized" guard from timer_get_boot_us() into timer_init() so
that the later timer_init() from the generic init sequence is a no-op.
Where the system counter timer_init() is not compiled in, the weak
definition is empty and the calling it is harmless.

Fixes: b059837850e4 ("imx: mx7: add gpc initialization for low power mode")
Fixes: 9c1b13b3fd27 ("cyclic: reduce get_timer_us() calls inside hlist_for_each_entry_safe()")
Signed-off-by: Emanuele Ghidoli <[email protected]>
Reviewed-by: Stefan Roese <[email protected]>

0 files changed, 0 insertions, 0 deletions