Re: [PATCH 8/9] net: ethernet: ti: cpts: fix overflow check period

@@ -427,9 +427,6 @@ static void cpts_calc_mult_shift(struct cpts *cpts)
 	u64 ns;
 	u64 frac;
 
-	if (cpts->cc_mult || cpts->cc.shift)
-		return;
-
 	freq = clk_get_rate(cpts->refclk);
 
 	/* Calc the maximum number of seconds which we can run before

@@ -442,11 +439,20 @@ static void cpts_calc_mult_shift(struct cpts *cpts)
 	else if (maxsec > 600 && cpts->cc.mask > UINT_MAX)
 		maxsec = 600;
 
+	/* Calc overflow check period (maxsec / 2) */
+	cpts->ov_check_period = (HZ * maxsec) / 2;
+	dev_info(cpts->dev, "cpts: overflow check period %lu\n",
+		 cpts->ov_check_period);
+
+	if (cpts->cc_mult || cpts->cc.shift)
+		return;
+
 	clocks_calc_mult_shift(&mult, &shift, freq, NSEC_PER_SEC, maxsec);
 
 	cpts->cc_mult = mult;
 	cpts->cc.mult = mult;
 	cpts->cc.shift = shift;
+

 	/* Check calculations and inform if not precise */
 	frac = 0;
 	ns = cyclecounter_cyc2ns(&cpts->cc, freq, cpts->cc.mask, &frac);

diff --git a/drivers/net/ethernet/ti/cpts.h b/drivers/net/ethernet/ti/cpts.h
index 47026ec..e0e4a62b 100644
--- a/drivers/net/ethernet/ti/cpts.h
+++ b/drivers/net/ethernet/ti/cpts.h

@@ -97,9 +97,6 @@ enum {
 	CPTS_EV_TX,   /* Ethernet Transmit Event */
 };
 
-/* This covers any input clock up to about 500 MHz. */
-#define CPTS_OVERFLOW_PERIOD (HZ * 8)
-
 #define CPTS_FIFO_DEPTH 16
 #define CPTS_MAX_EVENTS 32
 

@@ -127,6 +124,7 @@ struct cpts {
 	struct list_head events;
 	struct list_head pool;
 	struct cpts_event pool_data[CPTS_MAX_EVENTS];
+	unsigned long ov_check_period;
 };
 
 int cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb);

-- 
2.9.3