[ALSA] sun-cs4231: improved waiting after MCE down

This patch sync sparc driver with x86 isa cs4231 driver patches.
It fixes wrong waiting for the auto calibration bit and makes
further waiting use much finer granularity.
Signed-off-by: NKrzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@suse.cz>

sound/sparc/cs4231.c

@@ -422,44 +422,39 @@ static void snd_cs4231_mce_down(struct snd_cs4231 *chip)
 		spin_unlock_irqrestore(&chip->lock, flags);
 		return;
 	}
-	snd_cs4231_busy_wait(chip);
-
-	/* calibration process */
 
-	snd_cs4231_ready(chip);
-	snd_cs4231_ready(chip);
-	timeout = snd_cs4231_in(chip, CS4231_TEST_INIT);
-	if ((timeout & CS4231_CALIB_IN_PROGRESS) == 0) {
-		snd_printd("cs4231_mce_down - auto calibration time out (1)\n");
-		spin_unlock_irqrestore(&chip->lock, flags);
-		return;
-	}
+	/*
+	 * Wait for (possible -- during init auto-calibration may not be set)
+	 * calibration process to start. Needs upto 5 sample periods on AD1848
+	 * which at the slowest possible rate of 5.5125 kHz means 907 us.
+	 */
+	msleep(1);
 
-	/* in 10ms increments, check condition, up to 250ms */
-	timeout = 25;
+	/* check condition up to 250ms */
+	timeout = msecs_to_jiffies(250);
 	while (snd_cs4231_in(chip, CS4231_TEST_INIT) &
 		CS4231_CALIB_IN_PROGRESS) {
 
 		spin_unlock_irqrestore(&chip->lock, flags);
-		if (--timeout < 0) {
+		if (timeout <= 0) {
 			snd_printk("mce_down - "
 				   "auto calibration time out (2)\n");
 			return;
 		}
-		msleep(10);
+		timeout = schedule_timeout(timeout);
 		spin_lock_irqsave(&chip->lock, flags);
 	}
 
-	/* in 10ms increments, check condition, up to 100ms */
-	timeout = 10;
+	/* check condition up to 100ms */
+	timeout = msecs_to_jiffies(100);
 	while (__cs4231_readb(chip, CS4231U(chip, REGSEL)) & CS4231_INIT) {
 		spin_unlock_irqrestore(&chip->lock, flags);
-		if (--timeout < 0) {
+		if (timeout <= 0) {
 			snd_printk("mce_down - "
 				   "auto calibration time out (3)\n");
 			return;
 		}
-		msleep(10);
+		timeout = schedule_timeout(timeout);
 		spin_lock_irqsave(&chip->lock, flags);
 	}
 	spin_unlock_irqrestore(&chip->lock, flags);