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Commit 4eb4550a authored by Takashi Iwai's avatar Takashi Iwai Committed by Jaroslav Kysela
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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: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarJaroslav Kysela <perex@suse.cz>
parent ac8842a0

sound/i2c/cs8427.c

+6 −0
Original line number Diff line number Diff line
@@ -228,6 +228,12 @@ 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 "