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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 <russ.dill@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Joel Fernandes 2013-11-26 15:03:36 -08:00 committed by Tony Lindgren
parent edd5eb4e99
commit 912e663127
1 changed files with 4 additions and 1 deletions
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5
arch/arm/plat-omap/include/plat/dmtimer.h
View File

@ -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);