On Thu, Sep 06, 2018 at 09:25:37PM +0800, Chen-Yu Tsai wrote:
> The default mid-level PLL bias current setting interferes with sigma
> delta modulation. This manifests as decreased audio quality at lower
> sampling rates, which sounds like radio broadcast quality, and
> distortion noises at sampling rates at 48 kHz or above.
>
> Changing the bias current settings to the lowest gets rid of the
> noise.
>
> Fixes: de3448519194 ("clk: sunxi-ng: sun4i: Use sigma-delta modulation
> for audio PLL")
> Cc: <stable@xxxxxxxxxxxxxxx> # 4.15.x
> Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>
Applied, thanks!
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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