Hi Takashi.
When the ad1848/cs2431 is first being initialized, auto-calibration may not be set causing a timeout waiting for it in snd_ad1848/cs4231_mce_down().
This has no dire consequences other than an alarming printk, but since what we need to wait for is for the calibration to _finish_, let's just check for that instead.
The early chips need a slight delay (as commented -- 5 sample periods) to be sure that _if_ calibration is going to happen, it has started when we check While the CS4231A datasheet implies it'll happen immediately on downing MCE, some testing is showing that there's a window there as well, so just do the delay everywhere.
Thanks to Krysztof Helt for pinpointing this problem.
Signed-off-by: Rene Herman rene.herman@gmail.com
Rene.
diff --git a/sound/isa/ad1848/ad1848_lib.c b/sound/isa/ad1848/ad1848_lib.c index 8094282..dcd4435 100644 --- a/sound/isa/ad1848/ad1848_lib.c +++ b/sound/isa/ad1848/ad1848_lib.c @@ -227,16 +227,15 @@ static void snd_ad1848_mce_down(struct snd_ad1848 *chip) spin_unlock_irqrestore(&chip->reg_lock, flags); return; } - /* calibration process */
- for (timeout = 500; timeout > 0 && (snd_ad1848_in(chip, AD1848_TEST_INIT) & AD1848_CALIB_IN_PROGRESS) == 0; timeout--); - if ((snd_ad1848_in(chip, AD1848_TEST_INIT) & AD1848_CALIB_IN_PROGRESS) == 0) { - snd_printd("mce_down - auto calibration time out (1)\n"); - spin_unlock_irqrestore(&chip->reg_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); #if 0 - printk("(2) timeout = %i, jiffies = %li\n", timeout, jiffies); + printk("(2) jiffies = %li\n", jiffies); #endif time = HZ / 4; while (snd_ad1848_in(chip, AD1848_TEST_INIT) & AD1848_CALIB_IN_PROGRESS) { diff --git a/sound/isa/cs423x/cs4231_lib.c b/sound/isa/cs423x/cs4231_lib.c index 914d77b..9e8e0f1 100644 --- a/sound/isa/cs423x/cs4231_lib.c +++ b/sound/isa/cs423x/cs4231_lib.c @@ -346,16 +346,14 @@ void snd_cs4231_mce_down(struct snd_cs4231 *chip) } snd_cs4231_busy_wait(chip);
- /* calibration process */ - - for (timeout = 500; timeout > 0 && (snd_cs4231_in(chip, CS4231_TEST_INIT) & CS4231_CALIB_IN_PROGRESS) == 0; timeout--) - udelay(10); - if ((snd_cs4231_in(chip, CS4231_TEST_INIT) & CS4231_CALIB_IN_PROGRESS) == 0) { - snd_printd("cs4231_mce_down - auto calibration time out (1)\n"); - 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); #if 0 - printk("(2) timeout = %i, jiffies = %li\n", timeout, jiffies); + printk("(2) jiffies = %li\n", jiffies); #endif /* in 10 ms increments, check condition, up to 250 ms */ timeout = 25;