Thread (19 messages) 19 messages, 2 authors, 2016-12-06

Re: [PATCH v4 09/13] net: ethernet: ti: cpts: rework initialization/deinitialization

From: Richard Cochran <hidden>
Date: 2016-12-06 13:40:46
Also in: linux-omap, lkml, netdev

On Mon, Dec 05, 2016 at 02:05:21PM -0600, Grygorii Strashko wrote:
quoted hunk ↗ jump to hunk
@@ -372,34 +354,27 @@ void cpts_tx_timestamp(struct cpts *cpts, struct sk_buff *skb)
 }
 EXPORT_SYMBOL_GPL(cpts_tx_timestamp);
 
-int cpts_register(struct device *dev, struct cpts *cpts,
-		  u32 mult, u32 shift)
+int cpts_register(struct cpts *cpts)
 {
 	int err, i;
 
-	cpts->info = cpts_info;
-	spin_lock_init(&cpts->lock);
-
-	cpts->cc.read = cpts_systim_read;
-	cpts->cc.mask = CLOCKSOURCE_MASK(32);
-	cpts->cc_mult = mult;
-	cpts->cc.mult = mult;
-	cpts->cc.shift = shift;
-
 	INIT_LIST_HEAD(&cpts->events);
 	INIT_LIST_HEAD(&cpts->pool);
 	for (i = 0; i < CPTS_MAX_EVENTS; i++)
 		list_add(&cpts->pool_data[i].list, &cpts->pool);
 
-	cpts_clk_init(dev, cpts);
+	clk_enable(cpts->refclk);
+
 	cpts_write32(cpts, CPTS_EN, control);
 	cpts_write32(cpts, TS_PEND_EN, int_enable);
 
+	/* reinitialize cc.mult to original value as it can be modified
+	 * by cpts_ptp_adjfreq().
+	 */
+	cpts->cc.mult = cpts->cc_mult;
This still isn't quite right.  First of all, you shouldn't clobber the
learned cc.mult value in cpts_register().  Presumably, if PTP had been
run on this port before, then the learned frequency is approximately
correct, and it should be left alone.

[ BTW, resetting the timecounter here makes no sense either.  Why
  reset the clock just because the interface goes down?  ]

Secondly, you have made the initialization order of these fields hard
to follow.  With the whole series applied:

probe()
	cpts_create()
		cpts_of_parse()
		{
			/* Set cc_mult but not cc.mult! */
			set cc_mult
			set cc.shift
		}
		cpts_calc_mult_shift()
		{
			/* Set them both. */
			cpts->cc_mult = mult;
			cpts->cc.mult = mult;
			cpts->cc.shift = shift;
		}
/* later on */
cpts_register()
	cpts->cc.mult = cpts->cc_mult;

There is no need for such complexity.  Simply set cc.mult in
cpts_create() _once_, immediately after the call to
cpts_calc_mult_shift().

You can remove the assignment from cpts_calc_mult_shift() and
cpts_register().

Thanks,
Richard
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