ti-soc-thermal: implement eocz bit to make driver useful on omap3

For omap3, proper implementation of eocz bit is needed. It was
actually a TODO in the driver.
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

drivers/thermal/ti-soc-thermal/ti-bandgap.c

@@ -894,7 +894,8 @@ void *ti_bandgap_get_sensor_data(struct ti_bandgap *bgp, int id)
 static int
 ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id)
 {
-	u32 temp = 0, counter = 1000;
+	u32 counter = 1000;
+	struct temp_sensor_registers *tsr;
 
 	/* Select single conversion mode */
 	if (TI_BANDGAP_HAS(bgp, MODE_CONFIG))
@@ -902,16 +903,27 @@ ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id)
 
 	/* Start of Conversion = 1 */
 	RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 1);
-	/* Wait until DTEMP is updated */
-	temp = ti_bandgap_read_temp(bgp, id);
 
-	while ((temp == 0) && --counter)
-		temp = ti_bandgap_read_temp(bgp, id);
-	/* REVISIT: Check correct condition for end of conversion */
+	/* Wait for EOCZ going up */
+	tsr = bgp->conf->sensors[id].registers;
+
+	while (--counter) {
+		if (ti_bandgap_readl(bgp, tsr->temp_sensor_ctrl) &
+		    tsr->bgap_eocz_mask)
+			break;
+	}
 
 	/* Start of Conversion = 0 */
 	RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 0);
 
+	/* Wait for EOCZ going down */
+	counter = 1000;
+	while (--counter) {
+		if (!(ti_bandgap_readl(bgp, tsr->temp_sensor_ctrl) &
+		      tsr->bgap_eocz_mask))
+			break;
+	}
+
 	return 0;
 }