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gianfar: fix fiper alignment after resetting the time 

After resetting the time, the PPS signals on the FIPER output channels
are incorrectly offset from the clock time, as can be readily verified
by a looping back the FIPER to the external time stamp input.

Despite its name, setting the "Fiper Realignment Disable" bit seems to
fix the problem, at least on the P2020.

Also, following the example code from the Freescale BSP, it is not really
necessary to disable and re-enable the timer in order to reprogram the
FIPER. (The documentation is rather unclear on this point. It seems that
writing to the alarm register also disables the FIPER.)

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Cc: <stable@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran 2011-08-06 21:03:03 +00:00 committed by David S. Miller
parent c2e2a313ff
commit cbc056602c
1 changed files with 2 additions and 7 deletions
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9
drivers/net/gianfar_ptp.c
View File

@ -193,14 +193,9 @@ static void set_alarm(struct etsects *etsects)
/* Caller must hold etsects->lock. */
static void set_fipers(struct etsects *etsects)
{
u32 tmr_ctrl = gfar_read(&etsects->regs->tmr_ctrl);
gfar_write(&etsects->regs->tmr_ctrl, tmr_ctrl & (~TE));
gfar_write(&etsects->regs->tmr_prsc, etsects->tmr_prsc);
set_alarm(etsects);
gfar_write(&etsects->regs->tmr_fiper1, etsects->tmr_fiper1);
gfar_write(&etsects->regs->tmr_fiper2, etsects->tmr_fiper2);
set_alarm(etsects);
gfar_write(&etsects->regs->tmr_ctrl, tmr_ctrl|TE);
}
/*
@ -511,7 +506,7 @@ static int gianfar_ptp_probe(struct platform_device *dev)
gfar_write(&etsects->regs->tmr_fiper1, etsects->tmr_fiper1);
gfar_write(&etsects->regs->tmr_fiper2, etsects->tmr_fiper2);
set_alarm(etsects);
gfar_write(&etsects->regs->tmr_ctrl, tmr_ctrl|FS|RTPE|TE);
gfar_write(&etsects->regs->tmr_ctrl, tmr_ctrl|FS|RTPE|TE|FRD);
spin_unlock_irqrestore(&etsects->lock, flags);