[media] tda18271: delay IR & RF calibration until init() if delay_cal is set

if the configuration option 'delay_cal' is set, delay both IR & RF
calibration until init() is called.
both module option 'cal' or configuration option 'rf_cal_on_startup'
will override this delay. it makes no sense to mix 'delay_cal' with
'rf_cal_on_startup' as these options conflict with each other.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/tuners/tda18271-fe.c

@@ -1278,6 +1278,11 @@ struct dvb_frontend *tda18271_attach(struct dvb_frontend *fe, u8 addr,
 		if (tda_fail(ret))
 			goto fail;
 
+		/* if delay_cal is set, delay IR & RF calibration until init()
+		 * module option 'cal' overrides this delay */
+		if ((cfg->delay_cal) && (!tda18271_need_cal_on_startup(cfg)))
+			break;
+
 		mutex_lock(&priv->lock);
 		tda18271_init_regs(fe);
 

drivers/media/tuners/tda18271.h

@@ -105,6 +105,11 @@ struct tda18271_config {
 	/* force rf tracking filter calibration on startup */
 	unsigned int rf_cal_on_startup:1;
 
+	/* prevent any register access during attach(),
+	 * delaying both IR & RF calibration until init()
+	 * module option 'cal' overrides this delay */
+	unsigned int delay_cal:1;
+
 	/* interface to saa713x / tda829x */
 	unsigned int config;
 };