[alsa-devel] [PATCH] ALSA: ASoC: cs4720: use snd_soc_cache_sync()

[Timur Tabi]

Daniel Mack wrote:
> The code is so simple that I'm starting to suspect
> i2c_smbus_write_byte_data() is doing something very wrong, but I can't
> trace it without a hardware I2C analyzer right now. The i2c-regmap
> low-level implementation uses different access functions under the hood,
> so maybe that's a regression.

What platform are you testing this on?  I never really understood the i2c vs. smbus thing (I can never tell which function an i2c device really needs), so I only know that the i2c code works on my PowerPC board.

Also keep in mind that a patch that affects i2c_smbus_write_byte_data() on PowerPC was recently posted, but not approved yet.  Check the thread, "i2c/busses: (mpc) Add support for SMBUS_READ_BLOCK_DATA".  

-- 
Timur Tabi
Linux kernel developer at Freescale