linux-kernel - Re: [PATCH v3 8/9] mailbox: mediatek: Add CMDQ secure mailbox driver

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Message-ID: <0124eca6dfcd45af4c454ab1937590ca89a2a787.camel@mediatek.com>
Date: Thu, 28 Dec 2023 05:31:37 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>, "robh+dt@...nel.org"
	<robh+dt@...nel.org>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, "chunkuang.hu@...nel.org"
	<chunkuang.hu@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	Singo Chang (張興國) <Singo.Chang@...iatek.com>,
	Johnson Wang (王聖鑫) <Johnson.Wang@...iatek.com>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Jason-ch Chen (陳建豪)
	<Jason-ch.Chen@...iatek.com>, Shawn Sung (宋孝謙)
	<Shawn.Sung@...iatek.com>, "mchehab@...nel.org" <mchehab@...nel.org>,
	Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 8/9] mailbox: mediatek: Add CMDQ secure mailbox driver

Hi, Jason:

On Fri, 2023-12-22 at 12:52 +0800, Jason-JH.Lin wrote:
> To support secure video path feature, GCE have to read/write
> registgers
> in the secure world. GCE will enable the secure access permission to
> the
> HW who wants to access the secure content buffer.
> 
> Add CMDQ secure mailbox driver to make CMDQ client user is able to
> sending their HW settings to the secure world. So that GCE can
> execute
> all instructions to configure HW in the secure world.
> 
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> ---

[snip]

> +
> +static struct mbox_chan *cmdq_sec_mbox_of_xlate(struct
> mbox_controller *mbox,
> +						const struct
> of_phandle_args *sp)
> +{
> +	struct cmdq_thread *thread;
> +	struct cmdq_sec_thread *sec_thread;
> +	int idx = sp->args[0];
> +
> +	if (mbox->num_chans <= idx) {
> +		pr_err("invalid thrd-idx:%u", idx);
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	thread = (struct cmdq_thread *)mbox->chans[idx].con_priv;
> +	thread->chan = &mbox->chans[idx];
> +	thread->priority = sp->args[1];
> +	sec_thread = container_of(thread, struct cmdq_sec_thread,
> thread);
> +	sec_thread->timeout_ms = CMDQ_NO_TIMEOUT;

The timeout_ms could only be CMDQ_NO_TIMEOUT, so this driver just has
no timeout. So drop timeout_ms.

Regards,
CK

> +
> +	return &mbox->chans[idx];
> +}
>