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path: root/drivers/clk/sunxi-ng/ccu-sun4i-a10.c
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Diffstat (limited to 'drivers/clk/sunxi-ng/ccu-sun4i-a10.c')
-rw-r--r--drivers/clk/sunxi-ng/ccu-sun4i-a10.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/clk/sunxi-ng/ccu-sun4i-a10.c b/drivers/clk/sunxi-ng/ccu-sun4i-a10.c
index ffa5dac221e4..129ebd2588fd 100644
--- a/drivers/clk/sunxi-ng/ccu-sun4i-a10.c
+++ b/drivers/clk/sunxi-ng/ccu-sun4i-a10.c
@@ -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);