From 1eaff71017d97ce2bc8e22b9a5cf11e5c6dd6c78 Mon Sep 17 00:00:00 2001 From: Jon Hunter Date: Thu, 4 Oct 2012 17:01:14 -0500 Subject: [PATCH] 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 Acked-by: Santosh Shilimkar --- arch/arm/plat-omap/dmtimer.c | 5 +---- arch/arm/plat-omap/include/plat/dmtimer.h | 1 - 2 files changed, 1 insertion(+), 5 deletions(-) diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c index 320d10381715..f0a3c4c72a42 100644 --- a/arch/arm/plat-omap/dmtimer.c +++ b/arch/arm/plat-omap/dmtimer.c @@ -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); diff --git a/arch/arm/plat-omap/include/plat/dmtimer.h b/arch/arm/plat-omap/include/plat/dmtimer.h index 2f9fd1d27aef..0c07e3753470 100644 --- a/arch/arm/plat-omap/include/plat/dmtimer.h +++ b/arch/arm/plat-omap/include/plat/dmtimer.h @@ -84,7 +84,6 @@ struct omap_dm_timer; struct timer_regs { u32 tidr; - u32 tisr; u32 tier; u32 twer; u32 tclr; -- 2.30.2