From 5ddfdf6e2ff46ccee8a764a87fedb4253c9c6ff3 Mon Sep 17 00:00:00 2001 From: Dana Conrad Date: Wed, 7 Aug 2024 00:13:44 +0000 Subject: ErosQNative: Set extra ES9018K2M options Set number of FSR edges required for DPLL/ASRC lock Set DPLL bandwidth larger Both should help prevent dropouts, especially with sample rates >=96khz Credit to ZappBranigan2972 on the forums Change-Id: I55a90d44ac7fcec5894377e32cdadad66bb05610 --- .../erosqnative/audiohw-erosqnative.c | 24 ++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'firmware/target/mips') diff --git a/firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c b/firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c index 4bd3316889..6968a19a1c 100644 --- a/firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c +++ b/firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c @@ -104,6 +104,30 @@ void audiohw_postinit(void) * for 24-bit data... */ // es9018k2m_write_reg(ES9018K2M_REG1_INPUT_CONFIG, 0b01001100); // 24-bit data + /* Datasheet: Sets the number os FSR edges that must occur before * + * the DPLL and ASRC can lock on to the the incoming Signal. * + * When Samplerates >= 96khz could be used, STOP_DIV should be set * + * to 0 (= 16384 FSR Edges). * + * Reg #10 [3:0] (0x05 default, 2730 FSR Edges) */ + es9018k2m_write_reg(ES9018K2M_REG10_MASTER_MODE_CTRL, 0x00); + + /* Datasheet: The ES90x8Q2M/K2M contains a Jitter Eliminator block, * + * which employs the use of a digital phase locked loop (DPLL) to * + * lock to the incoming audio clock rate. When in I2S or SPDIF mode, * + * the DPLL will lock to the frame clock (1 x fs). However, when in * + * DSD mode, the DPLL has no frame clock information, and must in- * + * stead lock to the bit clock rate (BCK). For this reason, there are * + * two bandwidth settings for the DPLL. * + Reg #12 [7:4] (0x05 default) bandwidth for I2S / SPDIF mode. + Reg #12 [3:0] (0x0A default) bandwidth for DSD mode. + * The DPLL bandwidth sets how quickly the DPLL can adjust its intern * + * representation of the audio clock. The higher the jitter or * + * frequency drift on the audio clock, the higher the bandwidth must * + * be so that the DPLL can react. * + * ! If the bandwidth is “too low”, the DPLL will loose lock and you * + * ! will hear random dropouts. (Fixed my SurfansF20 v3.2 dropouts) */ + es9018k2m_write_reg(ES9018K2M_REG12_DPLL_SETTINGS, 0xda); + } else { /* Default to SWVOL for PCM5102A DAC */ logf("Default to SWVOL: ret=%d", ret); } -- cgit v1.2.3