linux-kernel - Re: [PATCH 2/3] ASoC: qcom: q6apm: add support for reading firmware name from DT

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Date:   Wed, 28 Jun 2023 19:57:38 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Mark Brown <broonie@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     krzysztof.kozlowski+dt@...aro.org, andersson@...nel.org,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, johan+linaro@...nel.org,
        perex@...ex.cz, tiwai@...e.com, lgirdwood@...il.com,
        ckeepax@...nsource.cirrus.com, kuninori.morimoto.gx@...esas.com,
        linux-kernel@...r.kernel.org, pierre-louis.bossart@...ux.intel.com,
        alsa-devel@...a-project.org
Subject: Re: [PATCH 2/3] ASoC: qcom: q6apm: add support for reading firmware
 name from DT

On 28/06/2023 14:53, Mark Brown wrote:
> On Wed, Jun 28, 2023 at 11:26:20AM +0100, Srinivas Kandagatla wrote:
>> Currently firmware file name is autogenerated based on card name and model number,
>> however this imposed a restriction of finding firmware in a single firmware path.
>> Platform specific firmwares are normally located in sub folders of the SoC.
>>
>> Provide more flexibity by reading firmware-name from DT.
> 
> Why not try a series of firmware names/locations generated using the
> identifying information for the card/system?  That way we don't have to
> put a filename in the ABI which has fun scaling issues.

This is what was done by Srini in the initial (currently committed) 
version. Unfortunately this easily results in the audio topology being 
separated from the rest of the platform-specific firmware. For example, 
for the mentioned X13s we already have a subdir under /lib/firmware/qcom 
and several firmware-name DT properties pointing to the files in that 
subdir:

$ grep firmware-name 
arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
		firmware-name = "qcom/sc8280xp/LENOVO/21BX/qcdxkmsuc8280.mbn";
	firmware-name = "qcom/sc8280xp/LENOVO/21BX/qcadsp8280.mbn";
	firmware-name = "qcom/sc8280xp/LENOVO/21BX/qccdsp8280.mbn";

This is not unique to the X13s, other Qualcomm boards also use full paths.

-- 
With best wishes
Dmitry