The patch titled
pps: add parallel port PPS signal generator
has been removed from the -mm tree. Its filename was
pps-add-parallel-port-pps-signal-generator-v7.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: pps: add parallel port PPS signal generator
From: Alexander Gordeev <lasaine@xxxxxxxxxxxxx>
Add PPS signal generator which utilizes STROBE pin of a parallel port to
send PPS signals. It uses parport abstraction layer and hrtimers to
precisely control the signal.
Signed-off-by: Alexander Gordeev <lasaine@xxxxxxxxxxxxx>
Cc: Rodolfo Giometti <giometti@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/pps/generators/Kconfig | 6 +-----
drivers/pps/generators/pps_gen_parport.c | 11 +++++++++--
2 files changed, 10 insertions(+), 7 deletions(-)
diff -puN drivers/pps/generators/Kconfig~pps-add-parallel-port-pps-signal-generator-v7 drivers/pps/generators/Kconfig
--- a/drivers/pps/generators/Kconfig~pps-add-parallel-port-pps-signal-generator-v7
+++ a/drivers/pps/generators/Kconfig
@@ -2,16 +2,12 @@
# PPS generators configuration
#
-if PPS
-
comment "PPS generators support"
config PPS_GENERATOR_PARPORT
tristate "Parallel port PPS signal generator"
- depends on PARPORT != n && GENERIC_TIME
+ depends on PARPORT
help
If you say yes here you get support for a PPS signal generator which
utilizes STROBE pin of a parallel port to send PPS signals. It uses
parport abstraction layer and hrtimers to precisely control the signal.
-
-endif
diff -puN drivers/pps/generators/pps_gen_parport.c~pps-add-parallel-port-pps-signal-generator-v7 drivers/pps/generators/pps_gen_parport.c
--- a/drivers/pps/generators/pps_gen_parport.c~pps-add-parallel-port-pps-signal-generator-v7
+++ a/drivers/pps/generators/pps_gen_parport.c
@@ -76,8 +76,15 @@ static enum hrtimer_restart hrtimer_even
long lim, delta;
unsigned long flags;
- /* NB: approx time with blocked interrupts =
- send_delay + 3 * SAFETY_INTERVAL */
+ /* We have to disable interrupts here. The idea is to prevent
+ * other interrupts on the same processor to introduce random
+ * lags while polling the clock. getnstimeofday() takes <1us on
+ * most machines while other interrupt handlers can take much
+ * more potentially.
+ *
+ * NB: approx time with blocked interrupts =
+ * send_delay + 3 * SAFETY_INTERVAL
+ */
local_irq_save(flags);
/* first of all we get the time stamp... */
_
Patches currently in -mm which might be from lasaine@xxxxxxxxxxxxx are
origin.patch
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