[ALSA] This simplifies and fixes waiting loops of the mce_down()
function after Trent Piepho's patch for AD1848.
It also makes busy_wait() function call not atomic.
Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/sparc/cs4231.c b/sound/sparc/cs4231.c
index 9785382..f8c7a12 100644
--- a/sound/sparc/cs4231.c
+++ b/sound/sparc/cs4231.c
@@ -400,65 +400,44 @@
static void snd_cs4231_mce_down(struct snd_cs4231 *chip)
{
- unsigned long flags;
- unsigned long end_time;
- int timeout;
+ unsigned long flags, timeout;
+ int reg;
- spin_lock_irqsave(&chip->lock, flags);
snd_cs4231_busy_wait(chip);
+ spin_lock_irqsave(&chip->lock, flags);
#ifdef CONFIG_SND_DEBUG
if (__cs4231_readb(chip, CS4231U(chip, REGSEL)) & CS4231_INIT)
snd_printdd("mce_down [%p] - auto calibration time out (0)\n",
CS4231U(chip, REGSEL));
#endif
chip->mce_bit &= ~CS4231_MCE;
- timeout = __cs4231_readb(chip, CS4231U(chip, REGSEL));
- __cs4231_writeb(chip, chip->mce_bit | (timeout & 0x1f),
+ reg = __cs4231_readb(chip, CS4231U(chip, REGSEL));
+ __cs4231_writeb(chip, chip->mce_bit | (reg & 0x1f),
CS4231U(chip, REGSEL));
- if (timeout == 0x80)
- snd_printdd("mce_down [%p]: serious init problem - "
- "codec still busy\n",
- chip->port);
- if ((timeout & CS4231_MCE) == 0) {
+ if (reg == 0x80)
+ snd_printdd("mce_down [%p]: serious init problem "
+ "- codec still busy\n", chip->port);
+ if ((reg & CS4231_MCE) == 0) {
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.
+ * Wait for auto-calibration (AC) process to finish, i.e. ACI to go low.
*/
- msleep(1);
-
- /* check condition up to 250ms */
- end_time = jiffies + msecs_to_jiffies(250);
- while (snd_cs4231_in(chip, CS4231_TEST_INIT) &
- CS4231_CALIB_IN_PROGRESS) {
-
+ timeout = jiffies + msecs_to_jiffies(250);
+ do {
spin_unlock_irqrestore(&chip->lock, flags);
- if (time_after(jiffies, end_time)) {
- snd_printk("mce_down - "
- "auto calibration time out (2)\n");
- return;
- }
msleep(1);
spin_lock_irqsave(&chip->lock, flags);
- }
-
- /* check condition up to 100ms */
- end_time = jiffies + msecs_to_jiffies(100);
- while (__cs4231_readb(chip, CS4231U(chip, REGSEL)) & CS4231_INIT) {
- spin_unlock_irqrestore(&chip->lock, flags);
- if (time_after(jiffies, end_time)) {
- snd_printk("mce_down - "
- "auto calibration time out (3)\n");
- return;
- }
- msleep(1);
- spin_lock_irqsave(&chip->lock, flags);
- }
+ reg = snd_cs4231_in(chip, CS4231_TEST_INIT);
+ reg &= CS4231_CALIB_IN_PROGRESS;
+ } while (reg && time_before(jiffies, timeout));
spin_unlock_irqrestore(&chip->lock, flags);
+
+ if (reg)
+ snd_printk(KERN_ERR
+ "mce_down - auto calibration time out (2)\n");
}
static void snd_cs4231_advance_dma(struct cs4231_dma_control *dma_cont,
