linux-kernel - Re: [PATCH 1/2] ASoC: SOF: imx: Add i.MX8ULP HW support

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Date:   Tue, 19 Jul 2022 12:41:47 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     pierre-louis.bossart@...ux.intel.com, lgirdwood@...il.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, perex@...ex.cz, tiwai@...e.com,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org,
        shengjiu.wang@...il.com, linux-kernel@...r.kernel.org,
        sound-open-firmware@...a-project.org, alsa-devel@...a-project.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] ASoC: SOF: imx: Add i.MX8ULP HW support

On Tue, Jul 19, 2022 at 01:26:06PM +0800, Shengjiu Wang wrote:

Not a thorough review, just a few nitpicks:

> +#define MBOX_SIZE		0x1000
> +
> +struct arm_smccc_res		smc_resource;

This should be static shouldn't it?

> +static void imx8ulp_dsp_handle_reply(struct imx_dsp_ipc *ipc)
> +{
> +	struct imx8ulp_priv *priv = imx_dsp_get_data(ipc);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&priv->sdev->ipc_lock, flags);
> +
> +	imx8ulp_get_reply(priv->sdev);
> +	snd_sof_ipc_reply(priv->sdev, 0);
> +	spin_unlock_irqrestore(&priv->sdev->ipc_lock, flags);

Minor nitpick but a blank line before the unlock to match the one after
the lock would be a bit easier to read.

> +	regmap_update_bits(priv->regmap, SYSCTRL0, EXECUTE_BIT, EXECUTE_BIT);
> +	usleep_range(1, 2);
> +
> +	arm_smccc_smc(FSL_SIP_HIFI_XRDC, 0, 0, 0, 0, 0, 0, 0, &smc_resource);

You need linux/arm-smccc.h for this (as 0day said).

> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to init reserved memory region %d\n", ret);
> +		goto exit_pdev_unregister;
> +	}
> +
> +	priv->clks->dsp_clks = imx8ulp_dsp_clks;
> +	priv->clks->num_dsp_clks = ARRAY_SIZE(imx8ulp_dsp_clks);
> +
> +	ret = imx8_parse_clocks(sdev, priv->clks);
> +	if (ret < 0)
> +		goto exit_pdev_unregister;
> +
> +	ret = imx8_enable_clocks(sdev, priv->clks);
> +	if (ret < 0)
> +		goto exit_pdev_unregister;

We're registering the platform device before we enable the clocks - is
that safe?

> +static int imx8ulp_remove(struct snd_sof_dev *sdev)
> +{
> +	struct imx8ulp_priv *priv = sdev->pdata->hw_pdata;
> +
> +	platform_device_unregister(priv->ipc_dev);
> +
> +	return 0;
> +}

Could we just use devm?  I'm not seeing an ordering issue but I might be
missing something.

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