linux-kernel - Re: [PATCH v3 3/3] firmware: mediatek: add adsp ipc protocol interface

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Date:   Wed, 24 Nov 2021 18:25:30 +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 v3 3/3] firmware: mediatek: add adsp ipc protocol
 interface

On Wed, Nov 24, 2021 at 04:45:14PM +0800, allen-kh.cheng wrote:
>  drivers/firmware/Kconfig                      |   1 +
>  drivers/firmware/Makefile                     |   1 +
>  drivers/firmware/mediatek/Kconfig             |  10 ++
>  drivers/firmware/mediatek/Makefile            |   2 +
>  drivers/firmware/mediatek/mtk-adsp-ipc.c      | 130 ++++++++++++++++++
>  .../linux/firmware/mediatek/mtk-adsp-ipc.h    |  72 ++++++++++
>  6 files changed, 216 insertions(+)
>  create mode 100644 drivers/firmware/mediatek/Kconfig
>  create mode 100644 drivers/firmware/mediatek/Makefile
>  create mode 100644 drivers/firmware/mediatek/mtk-adsp-ipc.c
>  create mode 100644 include/linux/firmware/mediatek/mtk-adsp-ipc.h

The patch should move before the 2nd patch in the series as the 2nd patch uses mtk-adsp-ipc.h.

> diff --git a/drivers/firmware/mediatek/mtk-adsp-ipc.c b/drivers/firmware/mediatek/mtk-adsp-ipc.c
[...]
> +int adsp_ipc_send(struct mtk_adsp_ipc *ipc, unsigned int idx, uint32_t op)
> +{
> +	struct mtk_adsp_chan *dsp_chan = &ipc->chans[idx];
> +	struct adsp_mbox_ch_info *ch_info = dsp_chan->ch->con_priv;
> +	int ret;
> +
> +	if (idx >= MTK_ADSP_MBOX_NUM)
> +		return -EINVAL;

If idx >= MTK_ADSP_MBOX_NUM, the invalid memory access has occurred at beginning of the function.

> +static int mtk_adsp_ipc_probe(struct platform_device *pdev)
> +{
[...]
> +	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);

Why does it need to call device_set_of_node_from_dev()?

> +	for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
> +		chan_name = kasprintf(GFP_KERNEL, "mbox%d", i);
> +		if (!chan_name)
> +			return -ENOMEM;
> +
> +		dsp_chan = &dsp_ipc->chans[i];
> +		cl = &dsp_chan->cl;
> +		cl->dev = dev->parent;
> +		cl->tx_block = false;
> +		cl->knows_txdone = false;
> +		cl->tx_prepare = NULL;
> +		cl->rx_callback = adsp_ipc_recv;
> +
> +		dsp_chan->ipc = dsp_ipc;
> +		dsp_chan->idx = i;
> +		dsp_chan->ch = mbox_request_channel_byname(cl, chan_name);
> +		if (IS_ERR(dsp_chan->ch)) {
> +			ret = PTR_ERR(dsp_chan->ch);
> +			if (ret != -EPROBE_DEFER)
> +				dev_err(dev, "Failed to request mbox chan %d ret %d\n",
> +					i, ret);

If ret == -EPROBE_DEFER, wouldn't it need to return -EPROBE_DEFER?  It doesn't retry later if -EPROBE_DEFER.