Hi, Moudy:
On Tue, 2022-05-31 at 14:13 +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_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;
> + }
> +
> + cb_param = kzalloc(sizeof(*cb_param), GFP_KERNEL);
> + if (!cb_param) {
> + ret = -ENOMEM;
> + goto err_cmdq_data;
> + }
> +
> + cmd.pkt = cmdq_pkt_create(mdp->cmdq_clt, SZ_16K);
> + if (IS_ERR(cmd.pkt)) {
> + ret = PTR_ERR(cmd.pkt);
> + 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));
> +
> + 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;
> +
> + cmd.pkt->async_cb.data = (void *)cb_param;
async_cb is part of proprietary callback mechanism and I'm replacing
the proprietary one with standard one. My final patch is [1] (not
upstreamed yet) and 'data' would be removed. The way to get data
related to pkt:
strutc mdp_data {
struct cmdq_pkt pkt;
/* Other data such as mdp, user_cmdq_cb, ... */
}
The callback function would callback with pkt and you could use pkt to
find struct mdp_data{}.
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/commit/?h=mediatek-cmdq6&id=a35f642aa89f02b7307725cdaa3bfb348b26d093
Regards,
CK
> + mdp->cmdq_clt->client.rx_callback = mdp_handle_cmdq_callback;
> +
> + 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);
> +
> + 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, cb_param->comps,
> + cb_param->num_comps);
> +err_cmdq_data:
> + kfree(path);
> + atomic_dec(&mdp->job_count);
> + wake_up(&mdp->callback_wq);
> + if (cmd.pkt)
> + cmdq_pkt_destroy(cmd.pkt);
> + kfree(comps);
> + kfree(cb_param);
> + return ret;
> +}
