OMAP3: PRCM interrupt: only check and clear enabled PRCM IRQs

While handling PRCM IRQs, mask out interrupts that are not enabled in
PRM_IRQENABLE_MPU.  If these are not masked out, non-enabled
interrupts are caught, a WARN() is printed due to no 'handler' and the
events are cleared.  In addition to being noisy, this can also
interfere with independent polling of this register by SR/VP code.

This was noticed using SmartReflex transitions which cause the VPx_*
interrupts to be handled since they are set in PRM_IRQSTATUS_MPU even
but not enabled in PRM_IRQENABLE_MPU.

Acked-by: Mike Turquette <mturquette@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 12 insertions, 5 deletions

diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index ea0000bc5358..a15aa92d384e 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -267,13 +267,16 @@ static int _prcm_int_handle_wakeup(void)
  */
 static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
 {
-        u32 irqstatus_mpu;
+        u32 irqenable_mpu, irqstatus_mpu;
         int c = 0;
 
-        do {
-                irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
-                                        OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
+        irqenable_mpu = prm_read_mod_reg(OCP_MOD,
+                                         OMAP3_PRM_IRQENABLE_MPU_OFFSET);
+        irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
+                                         OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
+        irqstatus_mpu &= irqenable_mpu;
 
+        do {
                 if (irqstatus_mpu & (OMAP3430_WKUP_ST | OMAP3430_IO_ST)) {
                         c = _prcm_int_handle_wakeup();
 
@@ -292,7 +295,11 @@ static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
                 prm_write_mod_reg(irqstatus_mpu, OCP_MOD,
                                         OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
 
-        } while (prm_read_mod_reg(OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET));
+                irqstatus_mpu = prm_read_mod_reg(OCP_MOD,
+                                        OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
+                irqstatus_mpu &= irqenable_mpu;
+
+        } while (irqstatus_mpu);
 
         return IRQ_HANDLED;
 }