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authorTakashi Iwai <tiwai@suse.de>2007-09-20 17:34:57 +0200
committerJaroslav Kysela <perex@perex.cz>2007-10-16 16:51:01 +0200
commit4eb4550ab37d351ab0973ccec921a5a2d8560ec7 (patch)
treeeea37aad55455b8aa78a5f83a2426bff0969e9aa /sound/i2c
parentac8842a0391a776dfa8f59cc83582f6feffa913b (diff)
downloadlinux-linaro-stable-4eb4550ab37d351ab0973ccec921a5a2d8560ec7.tar.gz
[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>
Diffstat (limited to 'sound/i2c')
-rw-r--r--sound/i2c/cs8427.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/sound/i2c/cs8427.c b/sound/i2c/cs8427.c
index 64388cb8d6e5..e601caa6ea0b 100644
--- a/sound/i2c/cs8427.c
+++ b/sound/i2c/cs8427.c
@@ -229,6 +229,12 @@ int snd_cs8427_create(struct snd_i2c_bus *bus,
snd_i2c_lock(bus);
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) {
snd_i2c_unlock(bus);
snd_printk(KERN_ERR "unable to find CS8427 signature "
"(expected 0x%x, read 0x%x),\n",