linux-kernel - Re: [PATCH v14 3/3] media: platform: mtk-mdp3: add Mediatek MDP3 driver

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Date:   Thu, 28 Apr 2022 12:59:19 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Moudy Ho <moudy.ho@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
CC:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Rob Landley <rob@...dley.net>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Alexandre Courbot <acourbot@...omium.org>,
        <tfiga@...omium.org>, <drinkcat@...omium.org>,
        <pihsun@...omium.org>, <hsinyi@...gle.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        daoyuan huang <daoyuan.huang@...iatek.com>,
        Ping-Hsun Wu <ping-hsun.wu@...iatek.com>,
        <allen-kh.cheng@...iatek.com>, <xiandong.wang@...iatek.com>,
        <randy.wu@...iatek.com>, <jason-jh.lin@...iatek.com>,
        <roy-cw.yeh@...iatek.com>, <river.cheng@...iatek.com>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v14 3/3] media: platform: mtk-mdp3: add Mediatek MDP3
 driver

Hi, Moudy:

On Wed, 2022-04-27 at 15:05 +0800, Moudy Ho wrote:
> 

[snip]

> +
> +int mdp_cmdq_send(struct mdp_dev *mdp, struct mdp_cmdq_param *param)
> +{
> +	struct mdp_cmdq_cmd cmd;
> +	struct mdp_path *path = NULL;
> +	struct mdp_cmdq_cb_param *cb_param = NULL;
> +	struct mdp_comp *comps = NULL;
> +	struct device *dev = &mdp->pdev->dev;
> +	int i, ret;
> +
> +	atomic_inc(&mdp->job_count);
> +
> +	if (atomic_read(&mdp->suspended)) {
> +		atomic_dec(&mdp->job_count);
> +		return -ECANCELED;
> +	}
> +
> +	cmd.pkt = cmdq_pkt_create(mdp->cmdq_clt, SZ_16K);
> +	if (IS_ERR(cmd.pkt)) {
> +		atomic_dec(&mdp->job_count);
> +		wake_up(&mdp->callback_wq);
> +		return PTR_ERR(cmd.pkt);
> +	}
> +	cmd.event = &mdp->event[0];
> +
> +	path = kzalloc(sizeof(*path), GFP_KERNEL);
> +	if (!path) {
> +		ret = -ENOMEM;
> +		goto err_destroy_pkt;
> +	}
> +
> +	path->mdp_dev = mdp;
> +	path->config = param->config;
> +	path->param = param->param;
> +	for (i = 0; i < param->param->num_outputs; i++) {
> +		path->bounds[i].left = 0;
> +		path->bounds[i].top = 0;
> +		path->bounds[i].width =
> +			param->param->outputs[i].buffer.format.width;
> +		path->bounds[i].height =
> +			param->param->outputs[i].buffer.format.height;
> +		path->composes[i] = param->composes[i] ?
> +			param->composes[i] : &path->bounds[i];
> +	}
> +
> +	ret = mdp_path_ctx_init(mdp, path);
> +	if (ret) {
> +		dev_err(dev, "mdp_path_ctx_init error\n");
> +		goto err_destroy_pkt;
> +	}
> +
> +	mtk_mutex_prepare(mdp->mdp_mutex[MDP_PIPE_RDMA0]);
> +	for (i = 0; i < param->config->num_components; i++)
> +		mdp_comp_clock_on(&mdp->pdev->dev, path-
> >comps[i].comp);
> +
> +	ret = mdp_path_config(mdp, &cmd, path);
> +	if (ret) {
> +		dev_err(dev, "mdp_path_config error\n");
> +		goto err_destroy_pkt;
> +	}
> +
> +	cb_param = kzalloc(sizeof(*cb_param), GFP_KERNEL);
> +	if (!cb_param) {
> +		ret = -ENOMEM;
> +		goto err_destroy_pkt;
> +	}
> +
> +	comps = kcalloc(param->config->num_components, sizeof(*comps),
> +			GFP_KERNEL);
> +	if (!comps) {
> +		ret = -ENOMEM;
> +		goto err_destroy_pkt;
> +	}
> +
> +	for (i = 0; i < param->config->num_components; i++)
> +		memcpy(&comps[i], path->comps[i].comp,
> +		       sizeof(struct mdp_comp));
> +	cb_param->mdp = mdp;
> +	cb_param->user_cmdq_cb = param->cmdq_cb;
> +	cb_param->user_cb_data = param->cb_data;
> +	cb_param->pkt = cmd.pkt;
> +	cb_param->comps = comps;
> +	cb_param->num_comps = param->config->num_components;
> +	cb_param->mdp_ctx = param->mdp_ctx;
> +
> +	cmdq_pkt_finalize(cmd.pkt);
> +	ret = cmdq_pkt_flush_async(cmd.pkt,
> +				   mdp_handle_cmdq_callback,
> +				   (void *)cb_param);

Matthias has applied patch [1], so I think you have better to base on
patch [1] to send patch.

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/matthias.bgg/linux.git/commit/?h=v5.18-next/soc&id=5252c1c5a08e583ab1363f809002cd8a59272b35

Regards,
CK

> +	if (ret) {
> +		dev_err(dev, "cmdq_pkt_flush_async fail!\n");
> +		goto err_clock_off;
> +	}
> +	kfree(path);
> +	return 0;
> +
> +err_clock_off:
> +	mtk_mutex_unprepare(mdp->mdp_mutex[MDP_PIPE_RDMA0]);
> +	mdp_comp_clocks_off(&mdp->pdev->dev, cb_param->comps,
> +			    cb_param->num_comps);
> +err_destroy_pkt:
> +	cmdq_pkt_destroy(cmd.pkt);
> +	atomic_dec(&mdp->job_count);
> +	wake_up(&mdp->callback_wq);
> +	kfree(comps);
> +	kfree(cb_param);
> +	kfree(path);
> +
> +	return ret;
> +}
>