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[ALSA] Workaround for invalid signature read of CS8427 

Reading the signature of CS8427 over SPI/I2C fails on some devices
by mysterious reason.  In most cases, however, it succeeds at the
sequential read.  So, let's give a second chance to check the signature
again.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Takashi Iwai 2007-09-20 17:34:57 +02:00 committed by Jaroslav Kysela
parent ac8842a039
commit 4eb4550ab3
1 changed files with 6 additions and 0 deletions
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6
sound/i2c/cs8427.c
View File

@ -228,6 +228,12 @@ int snd_cs8427_create(struct snd_i2c_bus *bus,
snd_i2c_lock(bus); snd_i2c_lock(bus);
err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER); err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
if (err != CS8427_VER8427A) {
/* give second chance */
snd_printk(KERN_WARNING "invalid CS8427 signature 0x%x: "
"let me try again...\n", err);
err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
}
if (err != CS8427_VER8427A) { if (err != CS8427_VER8427A) {
snd_i2c_unlock(bus); snd_i2c_unlock(bus);
snd_printk(KERN_ERR "unable to find CS8427 signature " snd_printk(KERN_ERR "unable to find CS8427 signature "