[ARM PATCH] 2094/1: don't lose the system timer after resuming from sleep on SA11x0 and

 PXA2xx

Patch from Nicolas Pitre

Let's make sure OSCR doesn't end up to be restored with a value
past OSMR0 otherwise the system timer won't start ticking until
OSCR wraps around (aprox 17 min.

Also set OSCR _after_ OIER is restored to avoid matching when
corresponding match interrupt is masked out.

Signed-off-by: Nicolas Pitre 

arch/arm/mach-pxa/pm.c

@@ -45,7 +45,7 @@ extern void pxa_cpu_resume(void);
  */
 enum {	SLEEP_SAVE_START = 0,
 
-	SLEEP_SAVE_OSCR, SLEEP_SAVE_OIER,
+	SLEEP_SAVE_OIER,
 	SLEEP_SAVE_OSMR0, SLEEP_SAVE_OSMR1, SLEEP_SAVE_OSMR2, SLEEP_SAVE_OSMR3,
 
 	SLEEP_SAVE_GPLR0, SLEEP_SAVE_GPLR1, SLEEP_SAVE_GPLR2,
@@ -78,7 +78,6 @@ static int pxa_pm_enter(u32 state)
 	delta = xtime.tv_sec - RCNR;
 
 	/* save vital registers */
-	SAVE(OSCR);
 	SAVE(OSMR0);
 	SAVE(OSMR1);
 	SAVE(OSMR2);
@@ -149,9 +148,11 @@ static int pxa_pm_enter(u32 state)
 	RESTORE(OSMR1);
 	RESTORE(OSMR2);
 	RESTORE(OSMR3);
-	RESTORE(OSCR);
 	RESTORE(OIER);
 
+	/* OSMR0 is the system timer: make sure OSCR is sufficiently behind */
+	OSCR = OSMR0 - LATCH;
+
 	RESTORE(CKEN);
 
 	ICLR = 0;

arch/arm/mach-sa1100/pm.c

@@ -44,7 +44,7 @@ extern void sa1100_cpu_resume(void);
  */
 enum {	SLEEP_SAVE_SP = 0,
 
-	SLEEP_SAVE_OSCR, SLEEP_SAVE_OIER,
+	SLEEP_SAVE_OIER,
 	SLEEP_SAVE_OSMR0, SLEEP_SAVE_OSMR1, SLEEP_SAVE_OSMR2, SLEEP_SAVE_OSMR3,
 
 	SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
@@ -69,7 +69,6 @@ static int sa11x0_pm_enter(u32 state)
 	gpio = GPLR;
 
 	/* save vital registers */
-	SAVE(OSCR);
 	SAVE(OSMR0);
 	SAVE(OSMR1);
 	SAVE(OSMR2);
@@ -131,9 +130,11 @@ static int sa11x0_pm_enter(u32 state)
 	RESTORE(OSMR1);
 	RESTORE(OSMR2);
 	RESTORE(OSMR3);
-	RESTORE(OSCR);
 	RESTORE(OIER);
 
+	/* OSMR0 is the system timer: make sure OSCR is sufficiently behind */
+	OSCR = OSMR0 - LATCH;
+
 	/* restore current time */
 	xtime.tv_sec = RCNR + delta;