From: Jon Hunter <jon-hunter@ti.com>
Date: Fri, 6 Jul 2012 21:45:04 +0000 (-0500)
Subject: ARM: OMAP: Fix timer posted mode support
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=7b44cf2c15f81caf5c3a4ac59f0677edd64b9aeb;p=~shefty%2Frdma-dev.git

ARM: OMAP: Fix timer posted mode support

Currently the dmtimer posted mode is being enabled when the function
omap_dm_timer_enable_posted() 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 was before the
omap_dm_timer_enable_posted() function was introduced. 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@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
---

diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index 381a612e6a1..10ec31b8a3a 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -121,21 +121,16 @@ 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_enable_posted(timer);
-	omap_dm_timer_disable(timer);
 }
 
 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.
@@ -149,13 +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)