Currently the dmtimer posted mode is being enabled when the function
__omap_dm_timer_reset() is called. This function is only being called for
OMAP1 timers and OMAP2+ timers that are being used as system timers. Hence,
for OMAP2+ timers that are NOT being used as a system timer, posted mode is
not enabled but the "timer->posted" variable is still set (incorrectly) in
the omap_dm_timer_prepare() function.
This is a regression introduced by commit 3392cdd3 (ARM: OMAP: dmtimer:
switch-over to platform device driver) which changed the code to only call
omap_dm_timer_reset() for OMAP1 devices. Although this is a regression from
the original code it only impacts performance and so is not needed for stable.
Signed-off-by: Jon Hunter <jon-hunter@xxxxxx>
---
arch/arm/mach-omap2/timer.c | 3 +--
arch/arm/plat-omap/dmtimer.c | 14 +++++---------
arch/arm/plat-omap/include/plat/dmtimer.h | 9 ++++++++-
3 files changed, 14 insertions(+), 12 deletions(-)
diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index 5471706..e24ee0f 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -194,10 +194,9 @@ static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
}
__omap_dm_timer_init_regs(timer);
__omap_dm_timer_reset(timer, 1, 1);
- timer->posted = 1;
+ __omap_dm_timer_enable_posted(timer);
timer->rate = clk_get_rate(timer->fclk);
-
timer->reserved = 1;
return res;
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index c34f55b..22790ea 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -122,21 +122,15 @@ static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer)
static void omap_dm_timer_reset(struct omap_dm_timer *timer)
{
- omap_dm_timer_enable(timer);
if (timer->pdev->id != 1) {
omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
omap_dm_timer_wait_for_reset(timer);
}
-
__omap_dm_timer_reset(timer, 0, 0);
- omap_dm_timer_disable(timer);
- timer->posted = 1;
}
int omap_dm_timer_prepare(struct omap_dm_timer *timer)
{
- int ret;
-
/*
* FIXME: OMAP1 devices do not use the clock framework for dmtimers so
* do not call clk_get() for these devices.
@@ -150,13 +144,15 @@ int omap_dm_timer_prepare(struct omap_dm_timer *timer)
}
}
+ omap_dm_timer_enable(timer);
+
if (timer->capability & OMAP_TIMER_NEEDS_RESET)
omap_dm_timer_reset(timer);
- ret = omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
+ __omap_dm_timer_enable_posted(timer);
+ omap_dm_timer_disable(timer);
- timer->posted = 1;
- return ret;
+ return omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
}
static inline u32 omap_dm_timer_reserved_systimer(int id)
diff --git a/arch/arm/plat-omap/include/plat/dmtimer.h b/arch/arm/plat-omap/include/plat/dmtimer.h
index 5ce2f00..fa9d04b 100644
--- a/arch/arm/plat-omap/include/plat/dmtimer.h
+++ b/arch/arm/plat-omap/include/plat/dmtimer.h
@@ -348,13 +348,20 @@ static inline void __omap_dm_timer_reset(struct omap_dm_timer *timer,
l |= 1 << 2;
__raw_writel(l, timer->io_base + OMAP_TIMER_OCP_CFG_OFFSET);
+}
+
+static inline void __omap_dm_timer_enable_posted(struct omap_dm_timer *timer)
+{
+ if (timer->posted)
+ return;
if (timer->errata & OMAP_TIMER_ERRATA_I103_I767)
return;
- /* Match hardware reset default of posted mode */
__omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG,
OMAP_TIMER_CTRL_POSTED, 0);
+ timer->context.tsicr = OMAP_TIMER_CTRL_POSTED;
+ timer->posted = 1;
}
/**
--
1.7.9.5
--
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