linux-kernel - Re: [PATCH v2 0/2] ASoC: qcom: q6dsp-lpass-ports: Expand sampling rate and PCM format constraints

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Message-Id: <DF0GN7VV4R2W.2E3U1LMOF0JPG@linaro.org>
Date: Wed, 17 Dec 2025 11:38:03 +0000
From: "Alexey Klimov" <alexey.klimov@...aro.org>
To: "Ravi Hothi" <ravi.hothi@....qualcomm.com>, "Srinivas Kandagatla"
 <srini@...nel.org>, "Liam Girdwood" <lgirdwood@...il.com>, "Mark Brown"
 <broonie@...nel.org>, "Jaroslav Kysela" <perex@...ex.cz>, "Takashi Iwai"
 <tiwai@...e.com>
Cc: <linux-sound@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <kernel@....qualcomm.com>,
 <mohammad.rafi.shaik@....qualcomm.com>, <ajay.nandam@....qualcomm.com>
Subject: Re: [PATCH v2 0/2] ASoC: qcom: q6dsp-lpass-ports: Expand sampling
 rate and PCM format constraints

On Mon Dec 15, 2025 at 7:29 AM GMT, Ravi Hothi wrote:
>
>
> On 12/10/2025 7:26 PM, Alexey Klimov wrote:
>> On Wed Dec 10, 2025 at 6:51 AM GMT, Ravi Hothi wrote:
>>> This patch series expands the existing constraints in
>>> the q6dsp-lpass-ports driver to improve compatibility
>>> and flexibility for audio stream configurations.
>>>
>>> The first patch extends the supported sampling rates to cover a wider
>>> range, from 8000 Hz to 192000 Hz, ensuring better compatibility with
>>> diverse audio hardware and allowing more flexible audio stream setups.
>>>
>>> The second patch adds support for the 32-bit PCM format
>>> (SNDRV_PCM_FMTBIT_S32_LE) alongside the existing 16-bit
>>> and 24-bit formats, enabling handling of high-resolution
>>> audio streams and improving audio quality for supported hardware.
>> 
>> Is q6dsp-lpass-ports involved in compress offloaded playback on
>> existing devices? If yes, then how is it gonna play with
>> explicitly setting format/sampling rate to s16le/48k in sndcards drivers?
>>
> Support for s16le/48k is already available; these patch will expand the 
> existing constraint so that customers can use a wider range.

Unfortunately, you didn't answer any of my questions or answered
a different one.

Perhaps the main one: is q6dsp-lpass-ports involved in compress offloaded
playback on existing devices?

Thanks,
Alexey