Re: [alsa-devel] [PATCH] ASoC: cs42l56: Fix misuse of regmap_update_bits

[Charles Keepax]

On Tue, Nov 29, 2016 at 06:10:49PM +0100, Florian Vaussard wrote:
> Using regmap_update_bits(..., mask, 1) with 'mask' following (1 << k)
> and k greater than 0 is wrong. Indeed, _regmap_update_bits will perform
> (mask & 1), which results in 0 if LSB of mask is 0. Thus the call
> regmap_update_bits(..., mask, 1) is in reality equivalent to
> regmap_update_bits(..., mask, 0).
> 
> In such a case, the correct use is regmap_update_bits(..., mask, mask).
> 
> This driver is performing such a mistake with the CS42L56_AIN*_REF_MASK
> masks, which equal 0x10, 0x20, 0x40 and 0x80. Fix the driver to make it
> consistent with the API. Please note that this change is untested,
> as I do not have this piece of hardware. Testers are welcome!
> 
> Signed-off-by: Florian Vaussard <florian.vaussard@xxxxxxxxxx>
> ---

Looks good to me:

Reviewed-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

Thanks,
Charles