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authorTakashi Iwai <tiwai@suse.de>2007-09-20 11:34:57 -0400
committerJaroslav Kysela <perex@perex.cz>2007-10-16 10:51:01 -0400
commit4eb4550ab37d351ab0973ccec921a5a2d8560ec7 (patch)
treeeea37aad55455b8aa78a5f83a2426bff0969e9aa /sound/i2c
parentac8842a0391a776dfa8f59cc83582f6feffa913b (diff)
[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,
229 snd_i2c_lock(bus); 229 snd_i2c_lock(bus);
230 err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER); 230 err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
231 if (err != CS8427_VER8427A) { 231 if (err != CS8427_VER8427A) {
232 /* give second chance */
233 snd_printk(KERN_WARNING "invalid CS8427 signature 0x%x: "
234 "let me try again...\n", err);
235 err = snd_cs8427_reg_read(device, CS8427_REG_ID_AND_VER);
236 }
237 if (err != CS8427_VER8427A) {
232 snd_i2c_unlock(bus); 238 snd_i2c_unlock(bus);
233 snd_printk(KERN_ERR "unable to find CS8427 signature " 239 snd_printk(KERN_ERR "unable to find CS8427 signature "
234 "(expected 0x%x, read 0x%x),\n", 240 "(expected 0x%x, read 0x%x),\n",