[PATCH 3.8 69/91] ARM: OMAP2+: Disable POSTED mode for errata i103 and i767

[Kamal Mostafa]

3.8.13.15 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joel Fernandes <joelf at ti.com>

commit 912e663127c5f700da6805ce21635dce703cb2cc upstream.

Enabling of Posted mode is seen to cause problems on dmtimer modules on AM33xx
(much like other OMAPs).  Reference discussions on forums [1] [2]. Earlier
patch solving this on other OMAPs [3].

For OMAP SoCs with this errata, the fix has been to not enable Posted mode.
However, on some SoCs (atleast AM33xx) which carry this errata, Posted mode
is enabled on reset. So we not only need to ignore enabling of the POSTED bit
when the timer is requested, but also disable Posted mode if errata is present.

[1] http://e2e.ti.com/support/arm/sitara_arm/f/791/t/285744.aspx
[2] http://e2e.ti.com/support/arm/sitara_arm/f/791/t/270632.aspx
[3] http://www.spinics.net/lists/linux-omap/msg81770.html

Reported-by: Russ Dill <russ.dill at ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar at ti.com>
Signed-off-by: Joel Fernandes <joelf at ti.com>
Signed-off-by: Tony Lindgren <tony at atomide.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 arch/arm/plat-omap/include/plat/dmtimer.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm/plat-omap/include/plat/dmtimer.h b/arch/arm/plat-omap/include/plat/dmtimer.h
index a3fbc48..31e1715d 100644
--- a/arch/arm/plat-omap/include/plat/dmtimer.h
+++ b/arch/arm/plat-omap/include/plat/dmtimer.h
@@ -335,8 +335,11 @@ 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)
+	if (timer->errata & OMAP_TIMER_ERRATA_I103_I767) {
+		timer->posted = OMAP_TIMER_NONPOSTED;
+		__omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG, 0, 0);
 		return;
+	}
 
 	__omap_dm_timer_write(timer, OMAP_TIMER_IF_CTRL_REG,
 			      OMAP_TIMER_CTRL_POSTED, 0);
-- 
1.8.3.2