linux-kernel - Re: [PATCH v9 30/34] ASoC: qcom: qdsp6: Add SND kcontrol for fetching offload status

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Date:   Tue, 17 Oct 2023 17:53:44 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Wesley Cheng <quic_wcheng@...cinc.com>, mathias.nyman@...el.com,
        gregkh@...uxfoundation.org, lgirdwood@...il.com,
        broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, srinivas.kandagatla@...aro.org,
        bgoswami@...cinc.com, Thinh.Nguyen@...opsys.com
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v9 30/34] ASoC: qcom: qdsp6: Add SND kcontrol for fetching
 offload status



On 10/17/23 15:01, Wesley Cheng wrote:
> Add a kcontrol to the platform sound card to fetch the current offload
> status.  This can allow for userspace to ensure/check which USB SND
> resources are actually busy versus having to attempt opening the USB SND
> devices, which will result in an error if offloading is active.

I think I mentioned this a while back, but why not add the status in the
USB card itself? That's a generic component that all userspace agent
could query. Having a QCOM-specific control doesn't make the life of
userspace easier IMHO.