linux-kernel - Re: [PATCH 1/2] ASoC: SOF: mediatek: add mt8188 audio support

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Date:   Mon, 15 May 2023 13:25:44 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Trevor Wu <trevor.wu@...iatek.com>,
        pierre-louis.bossart@...ux.intel.com,
        peter.ujfalusi@...ux.intel.com, yung-chuan.liao@...ux.intel.com,
        ranjani.sridharan@...ux.intel.com, kai.vehmanen@...ux.intel.com,
        daniel.baluta@....com, broonie@...nel.org, lgirdwood@...il.com,
        tiwai@...e.com, perex@...ex.cz, matthias.bgg@...il.com
Cc:     yc.hung@...iatek.com, tinghan.shen@...iatek.com,
        sound-open-firmware@...a-project.org, alsa-devel@...a-project.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ASoC: SOF: mediatek: add mt8188 audio support

Il 15/05/23 07:25, Trevor Wu ha scritto:
> Add mt8188 dai driver and specify of_machine to support mt8188 audio.
> 
> Signed-off-by: Trevor Wu <trevor.wu@...iatek.com>
> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> Reviewed-by: Yaochun Hung <yc.hung@...iatek.com>
> Reviewed-by: Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
> ---
>   sound/soc/sof/mediatek/mt8186/mt8186.c | 61 +++++++++++++++++++++++++-
>   1 file changed, 60 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/sof/mediatek/mt8186/mt8186.c b/sound/soc/sof/mediatek/mt8186/mt8186.c
> index 419913c8474d..3a9c81418c1f 100644
> --- a/sound/soc/sof/mediatek/mt8186/mt8186.c
> +++ b/sound/soc/sof/mediatek/mt8186/mt8186.c
> @@ -594,7 +594,65 @@ static const struct sof_dev_desc sof_of_mt8186_desc = {
>   	.ops = &sof_mt8186_ops,
>   };
>   
> +/*
> + * DL2, DL3, UL4, UL5 are registered as SOF FE, so creating the corresponding
> + * SOF BE to complete the pipeline.
> + */
> +static struct snd_soc_dai_driver mt8188_dai[] = {
> +{
> +	.name = "SOF_DL2",
> +	.playback = {
> +		.channels_min = 1,
> +		.channels_max = 2,
> +	},
> +},
> +{
> +	.name = "SOF_DL3",
> +	.playback = {
> +		.channels_min = 1,
> +		.channels_max = 2,
> +	},
> +},
> +{
> +	.name = "SOF_UL4",
> +	.capture = {
> +		.channels_min = 1,
> +		.channels_max = 2,
> +	},
> +},
> +{
> +	.name = "SOF_UL5",
> +	.capture = {
> +		.channels_min = 1,
> +		.channels_max = 2,
> +	},
> +},
> +};
> +
> +/* mt8188 ops */
> +static struct snd_sof_dsp_ops sof_mt8188_ops;
> +
> +static int sof_mt8188_ops_init(struct snd_sof_dev *sdev)
> +{
> +	/* common defaults */
> +	memcpy(&sof_mt8188_ops, &sof_mt8186_ops, sizeof(struct snd_sof_dsp_ops));

Never use sizeof(type), always use destination var size! Anyway, there's more.

I don't think we need to perform this memcpy: we'll never see an instance of
both mt8186 and mt8188 drivers on the same machine, so you can safely just use
sof_mt8186_ops for mt8188...

> +
> +	sof_mt8188_ops.drv = mt8188_dai;

...which obviously means that this becomes

	sof_mt8186_ops.drv = mt8188_dai;

and....

> +	sof_mt8186_ops.num_drv = ARRAY_SIZE(mt8188_dai);
> +
> +	return 0;
> +}
> +
> +static struct snd_sof_of_mach sof_mt8188_machs[] = {
> +	{
> +		.compatible = "mediatek,mt8188",
> +		.sof_tplg_filename = "sof-mt8188.tplg",
> +	},
> +	{}
> +};
> +
>   static const struct sof_dev_desc sof_of_mt8188_desc = {
> +	.of_machines = sof_mt8188_machs,
>   	.ipc_supported_mask	= BIT(SOF_IPC),
>   	.ipc_default		= SOF_IPC,
>   	.default_fw_path = {
> @@ -607,7 +665,8 @@ static const struct sof_dev_desc sof_of_mt8188_desc = {
>   		[SOF_IPC] = "sof-mt8188.ri",
>   	},
>   	.nocodec_tplg_filename = "sof-mt8188-nocodec.tplg",
> -	.ops = &sof_mt8186_ops,
> +	.ops = &sof_mt8188_ops,

...this keeps being sof_mt8186_ops as well.

> +	.ops_init = sof_mt8188_ops_init,
>   };
>   
>   static const struct of_device_id sof_of_mt8186_ids[] = {

Regards,
Angelo