From: maxime.ripard@bootlin.com (Maxime Ripard)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] clk: sunxi-ng: sun4i: Set VCO and PLL bias current to lowest setting
Date: Fri, 7 Sep 2018 10:21:03 +0200 [thread overview]
Message-ID: <20180907082103.lyuubyqpojehtkz4@flea> (raw)
In-Reply-To: <20180906132537.20772-1-wens@csie.org>
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@vger.kernel.org> # 4.15.x
> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Applied, thanks!
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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prev parent reply other threads:[~2018-09-07 8:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-06 13:25 [PATCH] clk: sunxi-ng: sun4i: Set VCO and PLL bias current to lowest setting Chen-Yu Tsai
2018-09-07 8:21 ` Maxime Ripard [this message]
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