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SubjectRe: [PATCH v19 4/4] media: platform: mtk-mdp3: add Mediatek MDP3 driver
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Hi, Moudy:

On Fri, 2022-06-24 at 17:23 +0800, Moudy Ho wrote:
> This patch adds driver for Mediatek's Media Data Path ver.3 (MDP3).
> It provides the following functions:
> color transform, format conversion, resize, crop, rotate, flip
> and additional image quality enhancement.
>
> The MDP3 driver is mainly used for Google Chromebook products to
> import the new architecture to set the HW settings as shown below:
> User -> V4L2 framework
> -> MDP3 driver -> SCP (setting calculations)
> -> MDP3 driver -> CMDQ (GCE driver) -> HW
>
> Each modules' related operation control is sited in mtk-mdp3-comp.c
> Each modules' register table is defined in file with "mdp_reg_"
> prefix
> GCE related API, operation control sited in mtk-mdp3-cmdq.c
> V4L2 m2m device functions are implemented in mtk-mdp3-m2m.c
> Probe, power, suspend/resume, system level functions are defined in
> mtk-mdp3-core.c
>

[snip]

>
> +
> +int mdp_cmdq_send(struct mdp_dev *mdp, struct mdp_cmdq_param *param)
> +{
> + struct mdp_path *path = NULL;
> + struct mdp_cmdq_cmd *cmd = 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 = kzalloc(sizeof(*cmd), GFP_KERNEL);
> + if (!cmd) {
> + ret = -ENOMEM;
> + goto err_cmdq_data;
> + }
> +
> + if (mdp_cmdq_pkt_create(mdp->cmdq_clt, &cmd->pkt, SZ_16K)) {
> + ret = -ENOMEM;
> + goto err_cmdq_data;
> + }
> +
> + comps = kcalloc(param->config->num_components, sizeof(*comps),
> + GFP_KERNEL);
> + if (!comps) {
> + ret = -ENOMEM;
> + goto err_cmdq_data;
> + }
> +
> + path = kzalloc(sizeof(*path), GFP_KERNEL);
> + if (!path) {
> + ret = -ENOMEM;
> + goto err_cmdq_data;
> + }
> +
> + 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_cmdq_data;
> + }
> +
> + cmd->event = &mdp->event[0];
> + ret = mdp_path_config(mdp, cmd, path);
> + if (ret) {
> + dev_err(dev, "mdp_path_config error\n");
> + goto err_cmdq_data;
> + }
> + cmdq_pkt_finalize(&cmd->pkt);
> +
> + for (i = 0; i < param->config->num_components; i++)
> + memcpy(&comps[i], path->comps[i].comp,
> + sizeof(struct mdp_comp));
> +
> + mdp->cmdq_clt->client.rx_callback = mdp_handle_cmdq_callback;
> + cmd->mdp = mdp;
> + cmd->user_cmdq_cb = param->cmdq_cb;
> + cmd->user_cb_data = param->cb_data;
> + cmd->comps = comps;
> + cmd->num_comps = param->config->num_components;
> + cmd->mdp_ctx = param->mdp_ctx;
> +
> + mtk_mutex_prepare(mdp->mdp_mutex[MDP_PIPE_RDMA0]);
> + ret = mdp_comp_clocks_on(&mdp->pdev->dev, cmd->comps, cmd-
> >num_comps);
> + if (ret) {
> + dev_err(dev, "comp %d failed to enable clock!\n", ret);
> + goto err_clock_off;
> + }
> +
> + dma_sync_single_for_device(mdp->cmdq_clt->chan->mbox->dev,
> + cmd->pkt.pa_base, cmd-
> >pkt.cmd_buf_size,
> + DMA_TO_DEVICE);
> + ret = mbox_send_message(mdp->cmdq_clt->chan, &cmd->pkt);
> + if (ret < 0) {
> + dev_err(dev, "mbox send message fail %d!\n", ret);
> + goto err_clock_off;
> + }
> + mbox_client_txdone(mdp->cmdq_clt->chan, 0);
> +
> + kfree(path);
> + return 0;
> +
> +err_clock_off:
> + mtk_mutex_unprepare(mdp->mdp_mutex[MDP_PIPE_RDMA0]);
> + mdp_comp_clocks_off(&mdp->pdev->dev, cmd->comps,
> + cmd->num_comps);
> +err_cmdq_data:
> + kfree(path);
> + atomic_dec(&mdp->job_count);
> + wake_up(&mdp->callback_wq);
> + if (cmd->pkt.buf_size > 0)
> + mdp_cmdq_pkt_destroy(&cmd->pkt);
> + kfree(comps);
> + kfree(cmd);
> + return ret;
> +}

EXPORT_SYMBOL(mdp_cmdq_send);

So other kernel module could call this function.

Regards,
CK

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