diff options
| author | Krzysztof Helt <krzysztof.h1@wp.pl> | 2007-10-16 14:54:58 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@perex.cz> | 2007-10-23 08:04:28 +0200 |
| commit | 9823adf632c57e9728d651707abd324eb4454eb9 (patch) | |
| tree | a0d7b62ff0e0b1556be3fb919faf652b7019999b | |
| parent | 0895e91d60ef9bdef426d1ce14bb94bd5875870d (diff) | |
[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>
| -rw-r--r-- | sound/sparc/cs4231.c | 59 |
1 files changed, 19 insertions, 40 deletions
diff --git a/sound/sparc/cs4231.c b/sound/sparc/cs4231.c index 9785382a5f39..f8c7a120ccbb 100644 --- a/sound/sparc/cs4231.c +++ b/sound/sparc/cs4231.c @@ -400,65 +400,44 @@ static void snd_cs4231_mce_up(struct snd_cs4231 *chip) 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, |