From 35ce3c571297aee13c6da604d022929fd1aa9efb Mon Sep 17 00:00:00 2001 From: Dale Whinham Date: Sun, 30 Aug 2026 18:40:07 +0100 Subject: [PATCH] arm64: dts: qcom: x1-denali: Fix microphone distortion The microphones (2x) on Surface Pro 11 are currently ususable due to a misconfigured sample rate, which results in a very distorted recording with the voice barely audible. Under Windows, the DMIC0_CTL register is set to 0x00000005 while recording: bit 0 = 1 --> DMIC0 enabled bits 3:1 = 2 --> DMIC clock divider = /4 The current dmic-sample-rate of 4800000 corresponds to the default DMIC clock divider of /2. Dropping dmic-sample-rate to 2400000 sets the divider to /4, matching the working Windows configuration and resulting in perfect audio. While we're at it, remove the reference to dmic23_default, as we only have two microphones and don't need to configure the pins for a 3rd/4th microphone. Signed-off-by: Dale Whinham Reviewed-by: Abel Vesa Reviewed-by: Konrad Dybcio Link: https://lore.kernel.org/r/20260830-surface-pro-11-mic-fix-v1-1-36a53140373b@gmail.com Signed-off-by: Bjorn Andersson --- arch/arm64/boot/dts/qcom/x1-microsoft-denali.dtsi | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/boot/dts/qcom/x1-microsoft-denali.dtsi b/arch/arm64/boot/dts/qcom/x1-microsoft-denali.dtsi index ce7d958ca687..e3a53b8930d9 100644 --- a/arch/arm64/boot/dts/qcom/x1-microsoft-denali.dtsi +++ b/arch/arm64/boot/dts/qcom/x1-microsoft-denali.dtsi @@ -863,11 +863,11 @@ }; &lpass_vamacro { - pinctrl-0 = <&dmic01_default>, <&dmic23_default>; + pinctrl-0 = <&dmic01_default>; pinctrl-names = "default"; vdd-micb-supply = <&vreg_l1b_1p8>; - qcom,dmic-sample-rate = <4800000>; + qcom,dmic-sample-rate = <2400000>; }; &mdss {