On Wed, Sep 24, 2025 at 04:57:43PM +0800, 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:
>
> [ 784.904566] qcom-apm gprsvc:service:2:1: Error (1) Processing 0x01001002 cmd
> [ 784.912185] qcom-apm gprsvc:service:2:1: DSP returned error[1001002] 1
> [ 784.918927] q6apm-lpass-dais
> 3700000.remoteproc:glink-edge:gpr:service@1:bedais: Failed to start APM port
> 104
> [ 784.929947] q6apm-lpass-dais
> 3700000.remoteproc:glink-edge:gpr:service@1:bedais: ASoC error (-22): at
> snd_soc_dai_prepare() on DISPLAY_PORT_RX_0
>
> msm_dp_audio_prepare is not called because hdmi-codec driver only checks
> and runs hw_params. This commit will add hw_params callback function
> same as drm_connector_hdmi_audio_prepare, so that hdmi-codec driver can
> work with userspace alsa.
I think something is wrong here. The prepare callback also should be
called. Is it that the prepare callback is called too late?
>
> Tested with Radxa Dragon Q6A.
>
> Fixes: 98a8920e7b07 ("drm/msm/dp: reuse generic HDMI codec implementation")
>
> Signed-off-by: Jianfeng Liu <liujianfeng1...@gmail.com>
> ---
>
> drivers/gpu/drm/display/drm_hdmi_audio_helper.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/display/drm_hdmi_audio_helper.c
> b/drivers/gpu/drm/display/drm_hdmi_audio_helper.c
> index 7d78b02c1446..6ca1c7ad0632 100644
> --- a/drivers/gpu/drm/display/drm_hdmi_audio_helper.c
> +++ b/drivers/gpu/drm/display/drm_hdmi_audio_helper.c
> @@ -130,6 +130,7 @@ EXPORT_SYMBOL(drm_connector_hdmi_audio_plugged_notify);
>
> static const struct hdmi_codec_ops drm_connector_hdmi_audio_ops = {
> .audio_startup = drm_connector_hdmi_audio_startup,
> + .hw_params = drm_connector_hdmi_audio_prepare,
> .prepare = drm_connector_hdmi_audio_prepare,
> .audio_shutdown = drm_connector_hdmi_audio_shutdown,
> .mute_stream = drm_connector_hdmi_audio_mute_stream,
> --
> 2.43.0
>
--
With best wishes
Dmitry
