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One fix for the Allwinner A10 SoC's audio PLL that wasn't properly set 

and generating noise.
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Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux

Stephen writes:
  "clk fixes for v4.19-rc8

   One fix for the Allwinner A10 SoC's audio PLL that wasn't properly
   set and generating noise."

* tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
  clk: sunxi-ng: sun4i: Set VCO and PLL bias current to lowest setting
This commit is contained in:
Greg Kroah-Hartman 2018-10-17 13:40:10 +02:00
parent b955a910d7 02621216e1
commit c0cff31be7
1 changed files with 9 additions and 1 deletions
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10
drivers/clk/sunxi-ng/ccu-sun4i-a10.c
View File

@ -1434,8 +1434,16 @@ static void __init sun4i_ccu_init(struct device_node *node,
return;
}
/* Force the PLL-Audio-1x divider to 1 */
val = readl(reg + SUN4I_PLL_AUDIO_REG);
/*
* Force VCO and PLL bias current to lowest setting. Higher
* settings interfere with sigma-delta modulation and result
* in audible noise and distortions when using SPDIF or I2S.
*/
val &= ~GENMASK(25, 16);
/* Force the PLL-Audio-1x divider to 1 */
val &= ~GENMASK(29, 26);
writel(val | (1 << 26), reg + SUN4I_PLL_AUDIO_REG);