bus: arm-ccn: Fix spurious warning message

Because CCN's cycle counter always runs, it will generate
an interrupt on overflow even if the relevant perf event
was not requested, causing a spurious warning message.

Fixed now by warning on only normal counter unwanted
overflows. Also cleaning the overflow mask at init now,
not to warn on event previously requested by firmware.

Signed-off-by: Pawel Moll <[e-mail]>
Signed-off-by: Olof Johansson <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

drivers/bus/arm-ccn.c

···
 #define CCN_DT_PMCCNTRSR		0x0190
 #define CCN_DT_PMOVSR			0x0198
 #define CCN_DT_PMOVSR_CLR		0x01a0
+#define CCN_DT_PMOVSR_CLR__MASK				0x1f
 #define CCN_DT_PMCR			0x01a8
 #define CCN_DT_PMCR__OVFL_INTR_EN			(1 << 6)
 #define CCN_DT_PMCR__PMU_EN				(1 << 0)
···
 		struct perf_event *event = dt->pmu_counters[idx].event;
 		int overflowed = pmovsr & BIT(idx);
 
-		WARN_ON_ONCE(overflowed && !event);
+		WARN_ON_ONCE(overflowed && !event &&
+				idx != CCN_IDX_PMU_CYCLE_COUNTER);
 
 		if (!event || !overflowed)
 			continue;
···
 	/* Initialize DT subsystem */
 	ccn->dt.base = ccn->base + CCN_REGION_SIZE;
 	spin_lock_init(&ccn->dt.config_lock);
+	writel(CCN_DT_PMOVSR_CLR__MASK, ccn->dt.base + CCN_DT_PMOVSR_CLR);
 	writel(CCN_DT_CTL__DT_EN, ccn->dt.base + CCN_DT_CTL);
 	writel(CCN_DT_PMCR__OVFL_INTR_EN | CCN_DT_PMCR__PMU_EN,
 			ccn->dt.base + CCN_DT_PMCR);