linux-kernel - Re: [PATCH v4 3/3] mailbox: mediatek: add support for adsp mailbox controller

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Message-ID: <YaBl66b7VFJK84F4@google.com>
Date:   Fri, 26 Nov 2021 12:43:23 +0800
From:   Tzung-Bi Shih <tzungbi@...gle.com>
To:     "allen-kh.cheng" <allen-kh.cheng@...iatek.com>
Cc:     Jassi Brar <jassisinghbrar@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        cujomalainey@...gle.com,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        sound-open-firmware@...a-project.org
Subject: Re: [PATCH v4 3/3] mailbox: mediatek: add support for adsp mailbox
 controller

On Thu, Nov 25, 2021 at 08:29:25PM +0800, allen-kh.cheng wrote:
> diff --git a/drivers/mailbox/mtk-adsp-mailbox.c b/drivers/mailbox/mtk-adsp-mailbox.c
[...]
> +static bool mtk_adsp_mbox_last_tx_done(struct mbox_chan *chan)
> +{
> +	struct adsp_mbox_ch_info *ch_info = chan->con_priv;
> +	void __iomem *reg = ch_info->va_reg;
> +
> +	return (readl(reg + MTK_ADSP_MBOX_IN_CMD) == 0) ? true : false;

To be concise, readl(reg + MTK_ADSP_MBOX_IN_CMD) == 0.

> +static int mtk_adsp_mbox_probe(struct platform_device *pdev)
> +{
[...]
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(dev, "no adsp mbox register resource\n");
> +		return -ENXIO;
> +	}
> +
> +	priv->va_mboxreg = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(priv->va_mboxreg))
> +		return PTR_ERR(priv->va_mboxreg);

If using devm_platform_ioremap_resource(), it doesn't need to call platform_get_resource().  res is unused.