linux-kernel - Re: [PATCH v2] drm/display: add hw_params callback function to drm_connector_hdmi_audio

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Message-ID: <658446d1-5d3b-4924-a446-f26a1a8b9be6@kernel.org>
Date: Tue, 21 Oct 2025 13:04:44 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jianfeng Liu <liujianfeng1994@...il.com>, linux-arm-msm@...r.kernel.org
Cc: Xilin Wu <sophon@...xa.com>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
 David Airlie <airlied@...il.com>, Dmitry Baryshkov <lumag@...nel.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Mark Brown <broonie@...nel.org>, Maxime Ripard <mripard@...nel.org>,
 Simona Vetter <simona@...ll.ch>, Thomas Zimmermann <tzimmermann@...e.de>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/display: add hw_params callback function to
 drm_connector_hdmi_audio_ops

On 25/09/2025 06:05, Jianfeng Liu wrote:
> After reusing drm_hdmi_audio_* helpers and drm_bridge_connector
> integration in drm/msm/dp, we have dropped msm_dp_audio_hw_params and
> use msm_dp_audio_prepare instead. While userspace is still calling
> hw_params to do audio initialization, and we get the following errors:
> 
> q6apm-lpass-dais 3700000.remoteproc:glink-edge:gpr:service@1:bedais: q6apm_lpass_dai_prepare() started
> q6apm-lpass-dais 3700000.remoteproc:glink-edge:gpr:service@1:bedais: q6apm_lpass_dai_prepare() started
> q6apm-lpass-dais 3700000.remoteproc:glink-edge:gpr:service@1:bedais: q6apm_lpass_dai_prepare() started
> hdmi-audio-codec hdmi-audio-codec.0.auto: hdmi_codec_hw_params() started
> q6apm-lpass-dais 3700000.remoteproc:glink-edge:gpr:service@1:bedais: q6apm_lpass_dai_prepare() started
> qcom-apm gprsvc:service:2:1: Error (1) Processing 0x01001002 cmd
> qcom-apm gprsvc:service:2:1: DSP returned error[1001002] 1
> q6apm-lpass-dais 3700000.remoteproc:glink-edge:gpr:service@1:bedais: Failed to start APM port 104
> q6apm-lpass-dais 3700000.remoteproc:glink-edge:gpr:service@1:bedais: ASoC error (-22): at snd_soc_dai_prepare() on DISPLAY_PORT_RX_0
> MultiMedia2 Playback: ASoC error (-22): at dpcm_run_update_startup() on MultiMedia2 Playback
> 
> msm_dp_audio_prepare is not called because hdmi-codec driver only checks
> and runs hw_params before q6apm_lpass_dai_prepare(). This commit will
> add hw_params callback same as drm_connector_hdmi_audio_prepare, so that
> hdmi-codec driver can work with userspace alsa.
> 
> Tested with Radxa Dragon Q6A.
> 


Missing Cc stable.

> Fixes: 98a8920e7b07 ("drm/msm/dp: reuse generic HDMI codec implementation")
> Signed-off-by: Jianfeng Liu <liujianfeng1994@...il.com>
> ---

I confirm this fixes the audio over DP/HDMI on X1E laptops. Please apply
this for fixes.

Best regards,
Krzysztof