From: Kalle Jokiniemi <kalle.jokiniemi@digia.com>
To: khilman@deeprootsystems.com
Cc: linux-omap@vger.kernel.org
Subject: [PATCH 0/3] PM: Misc latency fixes
Date: Wed, 21 Oct 2009 14:51:18 +0300 [thread overview]
Message-ID: <1256125881-12441-1-git-send-email-kalle.jokiniemi@digia.com> (raw)
In-Reply-To: <>
Hello,
Here are some fruits from digging out the latency sources
of our idle loop. The main latency source was powerdomain
state counter updating at beginning and end of the idle
loop. Also PER previous state reading strangely seemed to
cause some latency with significance. Could not find any
TRM or errata comment to why this is, though.
The I2C mpu wakeup latency constraint patch has been updated
to calculate latencies at boot from clkrate and fifo size.
This was included in this set, since it benefits from the
reduced latency of the other patches.
Patches tested on linux-omap/pm and rx-51.
Kalle Jokiniemi (3):
OMAP3: Only update pm-counters when needed
PM: Skip PER previous state register read
OMAP: I2C: Add mpu wake up latency constraint in i2c
arch/arm/mach-omap2/pm-debug.c | 51 ++++++++++++++++++++++++++++++++++++-
arch/arm/mach-omap2/pm.h | 2 +
arch/arm/mach-omap2/pm34xx.c | 31 ++++++++++++++--------
arch/arm/plat-omap/i2c.c | 54 +++++++++++++++++++++++++++++++---------
drivers/i2c/busses/i2c-omap.c | 25 +++++++++++++++---
include/linux/i2c-omap.h | 9 ++++++
6 files changed, 143 insertions(+), 29 deletions(-)
next reply other threads:[~2009-10-21 11:51 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-21 11:51 Kalle Jokiniemi [this message]
2009-10-21 11:51 ` [PATCH 1/3] OMAP3: Only update pm-counters when needed Kalle Jokiniemi
2009-10-21 11:51 ` [PATCH 2/3] PM: Skip PER previous state register read Kalle Jokiniemi
2009-10-21 11:51 ` [PATCH V4 3/3] OMAP: I2C: Add mpu wake up latency constraint in i2c Kalle Jokiniemi
2009-10-23 15:53 ` Sonasath, Moiz
2009-10-29 8:55 ` Kalle Jokiniemi
2009-11-20 8:35 ` kalle.jokiniemi
2009-11-20 16:28 ` Kevin Hilman
2009-11-23 7:35 ` kalle.jokiniemi
[not found] ` <1256644921.6751.61.camel@ubuntu>
2009-11-23 16:10 ` Sonasath, Moiz
2009-11-24 15:19 ` kalle.jokiniemi
2009-11-24 15:54 ` Kevin Hilman
2009-10-30 16:31 ` [PATCH 2/3] PM: Skip PER previous state register read Kevin Hilman
2009-11-06 7:52 ` kalle.jokiniemi
2009-10-29 23:07 ` [PATCH 1/3] OMAP3: Only update pm-counters when needed Kevin Hilman
2009-10-30 9:06 ` Kalle Jokiniemi
2009-10-29 10:15 ` [PATCH 0/3] PM: Misc latency fixes Kalle Jokiniemi
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