From 912e663127c5f700da6805ce21635dce703cb2cc Mon Sep 17 00:00:00 2001 From: Joel Fernandes Date: Tue, 26 Nov 2013 15:03:36 -0800 Subject: ARM: OMAP2+: Disable POSTED mode for errata i103 and i767 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 Cc: stable@vgerk.kernel.org Reported-by: Russ Dill Cc: Santosh Shilimkar Signed-off-by: Joel Fernandes Signed-off-by: Tony Lindgren --- arch/arm/plat-omap/include/plat/dmtimer.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'arch/arm/plat-omap') diff --git a/arch/arm/plat-omap/include/plat/dmtimer.h b/arch/arm/plat-omap/include/plat/dmtimer.h index fb92abb91628..2861b155485a 100644 --- a/arch/arm/plat-omap/include/plat/dmtimer.h +++ b/arch/arm/plat-omap/include/plat/dmtimer.h @@ -336,8 +336,11 @@ 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); -- cgit v1.2.3