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ARM: OMAP: Don't restore DMTIMER interrupt status register 

Restoring the timer interrupt status is not possible because writing a 1 to any
bit in the register clears that bit if set and writing a 0 has no affect.
Furthermore, if an interrupt is pending when someone attempts to disable a
timer, the timer will fail to transition to the idle state and hence it's
context will not be lost. Users should take care to service all interrupts
before disabling the timer.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
This commit is contained in:
Jon Hunter 2012-10-04 17:01:14 -05:00
parent d3004bb43d
commit 1eaff71017
2 changed files with 1 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/arm/plat-omap/dmtimer.c
View File

@ -83,7 +83,6 @@ static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
static void omap_timer_restore_context(struct omap_dm_timer *timer)
{
__raw_writel(timer->context.tisr, timer->irq_stat);
omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG,
timer->context.twer);
omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG,
@ -440,7 +439,6 @@ int omap_dm_timer_stop(struct omap_dm_timer *timer)
*/
timer->context.tclr =
omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
timer->context.tisr = __raw_readl(timer->irq_stat);
omap_dm_timer_disable(timer);
return 0;
}
@ -684,8 +682,7 @@ int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
return -EINVAL;
__omap_dm_timer_write_status(timer, value);
/* Save the context */
timer->context.tisr = value;
return 0;
}
EXPORT_SYMBOL_GPL(omap_dm_timer_write_status);

1
arch/arm/plat-omap/include/plat/dmtimer.h
View File

@ -84,7 +84,6 @@ struct omap_dm_timer;
struct timer_regs {
u32 tidr;
u32 tisr;
u32 tier;
u32 twer;
u32 tclr;