From: Krzysztof Helt <krzysztof.h1@wp.pl>
Date: Mon, 10 Sep 2007 22:55:46 +0000 (+0200)
Subject: [ALSA] sun-cs4231: improved waiting after MCE down
X-Git-Tag: v2.6.24-rc1~832^2~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=56f91585b48bb3ca8ec38b84c92d3df2a2f2bf66;p=profile%2Fivi%2Fkernel-adaptation-intel-automotive.git

[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: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
---

diff --git a/sound/sparc/cs4231.c b/sound/sparc/cs4231.c
index 4f515a6..ab39860 100644
--- a/sound/sparc/cs4231.c
+++ b/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);