linux-kernel - Re: [PATCH] Asoc: wm_adsp: Add support for loading firmware with prefix name

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Message-ID: <20230329140524.GU68926@ediswmail.ad.cirrus.com>
Date:   Wed, 29 Mar 2023 14:05:24 +0000
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     Jianhua Lu <lujianhua000@...il.com>
CC:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>,
        Simon Trimmer <simont@...nsource.cirrus.com>,
        Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
        <patches@...nsource.cirrus.com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>,
        <~postmarketos/upstreaming@...ts.sr.ht>,
        <phone-devel@...r.kernel.org>
Subject: Re: [PATCH] Asoc: wm_adsp: Add support for loading firmware with
 prefix name

On Wed, Mar 29, 2023 at 09:05:25PM +0800, Jianhua Lu wrote:
> For platform using fdt, system_name is NULL, it doesn't provide
> a way to load firmware with prefix name, so add it.
> 
> Signed-off-by: Jianhua Lu <lujianhua000@...il.com>
> ---
>  sound/soc/codecs/wm_adsp.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
> index 216120b68b64..17481e42d440 100644
> --- a/sound/soc/codecs/wm_adsp.c
> +++ b/sound/soc/codecs/wm_adsp.c
> @@ -760,6 +760,10 @@ static int wm_adsp_request_firmware_file(struct wm_adsp *dsp,
>  		*filename = kasprintf(GFP_KERNEL, "%s%s-%s-%s-%s.%s", dir, dsp->part,
>  				      dsp->fwf_name, wm_adsp_fw[dsp->fw].file, system_name,
>  				      filetype);
> +	else if (asoc_component_prefix)
> +		*filename = kasprintf(GFP_KERNEL, "%s%s-%s-%s-%s.%s", dir, dsp->part,
> +				      dsp->fwf_name, wm_adsp_fw[dsp->fw].file, asoc_component_prefix,
> +				      filetype);
>  	else
>  		*filename = kasprintf(GFP_KERNEL, "%s%s-%s-%s.%s", dir, dsp->part, dsp->fwf_name,
>  				      wm_adsp_fw[dsp->fw].file, filetype);
> @@ -831,6 +835,16 @@ static int wm_adsp_request_firmware_files(struct wm_adsp *dsp,
>  							      NULL, "bin");
>  			return 0;
>  		}
> +	} else if (asoc_component_prefix) {
> +		if (!wm_adsp_request_firmware_file(dsp, wmfw_firmware, wmfw_filename,
> +						   cirrus_dir, NULL,
> +						   asoc_component_prefix, "wmfw")) {
> +			adsp_dbg(dsp, "Found '%s'\n", *wmfw_filename);
> +			wm_adsp_request_firmware_file(dsp, coeff_firmware, coeff_filename,
> +							      cirrus_dir, NULL,
> +							      asoc_component_prefix, "bin");
> +			return 0;
> +		}
>  	}

This direction seems slightly problematic, especially in the
context of amps (which I presume this relates to, please let know
if that is wrong). It would probably be better to be fixing
things up such that the amp in question sets system_name when
registered through DT. Generally speaking the idea is the amp
tuning is going to be specific to the enclosure/speaker involved,
so a generic tuning for say left amps doesn't really make a lot
of sense.

Thanks,
Charles