Re: [PATCH v4 2/3] media: platform: mtk-mdp3: Use cmdq_pkt_create() and cmdq_pkt_destroy()

[Matthias Brugger <matthias.bgg@gmail.com>]

On 01/09/2024 16:32, Chun-Kuang Hu wrote:
> Use cmdq_pkt_create() and cmdq_pkt_destroy() common function
> instead of implementing mdp3 version.
> 
> Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
> ---
>   .../platform/mediatek/mdp3/mtk-mdp3-cmdq.c    | 46 ++-----------------
>   .../platform/mediatek/mdp3/mtk-mdp3-cmdq.h    |  1 +
>   2 files changed, 6 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
> index ef5dade35fd3..740a484c8eb4 100644
> --- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
> +++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
> @@ -471,43 +471,6 @@ static int mdp_path_config(struct mdp_dev *mdp, struct mdp_cmdq_cmd *cmd,
>   	return 0;
>   }
>   
> -static int mdp_cmdq_pkt_create(struct cmdq_client *client, struct cmdq_pkt *pkt,
> -			       size_t size)
> -{
> -	struct device *dev;
> -	dma_addr_t dma_addr;
> -
> -	pkt->va_base = kzalloc(size, GFP_KERNEL);
> -	if (!pkt->va_base)
> -		return -ENOMEM;
> -
> -	pkt->buf_size = size;
> -	pkt->cl = (void *)client;

cmdq_pkt_create does not set the callback. Why doesn't that break things?
Same holds for the crtc driver that is already in linux-next.

Regards,
Matthias

> -
> -	dev = client->chan->mbox->dev;
> -	dma_addr = dma_map_single(dev, pkt->va_base, pkt->buf_size,
> -				  DMA_TO_DEVICE);
> -	if (dma_mapping_error(dev, dma_addr)) {
> -		dev_err(dev, "dma map failed, size=%u\n", (u32)(u64)size);
> -		kfree(pkt->va_base);
> -		return -ENOMEM;
> -	}
> -
> -	pkt->pa_base = dma_addr;
> -
> -	return 0;
> -}
> -
> -static void mdp_cmdq_pkt_destroy(struct cmdq_pkt *pkt)
> -{
> -	struct cmdq_client *client = (struct cmdq_client *)pkt->cl;
> -
> -	dma_unmap_single(client->chan->mbox->dev, pkt->pa_base, pkt->buf_size,
> -			 DMA_TO_DEVICE);
> -	kfree(pkt->va_base);
> -	pkt->va_base = NULL;
> -}
> -
>   static void mdp_auto_release_work(struct work_struct *work)
>   {
>   	struct mdp_cmdq_cmd *cmd;
> @@ -538,7 +501,7 @@ static void mdp_auto_release_work(struct work_struct *work)
>   		wake_up(&mdp->callback_wq);
>   	}
>   
> -	mdp_cmdq_pkt_destroy(&cmd->pkt);
> +	cmdq_pkt_destroy(mdp->cmdq_clt[cmd->pp_idx], &cmd->pkt);
>   	kfree(cmd->comps);
>   	cmd->comps = NULL;
>   	kfree(cmd);
> @@ -578,7 +541,7 @@ static void mdp_handle_cmdq_callback(struct mbox_client *cl, void *mssg)
>   		if (refcount_dec_and_test(&mdp->job_count))
>   			wake_up(&mdp->callback_wq);
>   
> -		mdp_cmdq_pkt_destroy(&cmd->pkt);
> +		cmdq_pkt_destroy(mdp->cmdq_clt[cmd->pp_idx], &cmd->pkt);
>   		kfree(cmd->comps);
>   		cmd->comps = NULL;
>   		kfree(cmd);
> @@ -620,7 +583,7 @@ static struct mdp_cmdq_cmd *mdp_cmdq_prepare(struct mdp_dev *mdp,
>   		goto err_uninit;
>   	}
>   
> -	ret = mdp_cmdq_pkt_create(mdp->cmdq_clt[pp_idx], &cmd->pkt, SZ_16K);
> +	ret = cmdq_pkt_create(mdp->cmdq_clt[pp_idx], &cmd->pkt, SZ_16K);
>   	if (ret)
>   		goto err_free_cmd;
>   
> @@ -700,6 +663,7 @@ static struct mdp_cmdq_cmd *mdp_cmdq_prepare(struct mdp_dev *mdp,
>   	cmd->comps = comps;
>   	cmd->num_comps = num_comp;
>   	cmd->mdp_ctx = param->mdp_ctx;
> +	cmd->pp_idx = pp_idx;
>   
>   	kfree(path);
>   	return cmd;
> @@ -711,7 +675,7 @@ static struct mdp_cmdq_cmd *mdp_cmdq_prepare(struct mdp_dev *mdp,
>   err_free_comps:
>   	kfree(comps);
>   err_destroy_pkt:
> -	mdp_cmdq_pkt_destroy(&cmd->pkt);
> +	cmdq_pkt_destroy(mdp->cmdq_clt[pp_idx], &cmd->pkt);
>   err_free_cmd:
>   	kfree(cmd);
>   err_uninit:
> diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.h b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.h
> index 53a30ad7e0b0..935ae9825728 100644
> --- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.h
> +++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.h
> @@ -35,6 +35,7 @@ struct mdp_cmdq_cmd {
>   	struct mdp_comp *comps;
>   	void *mdp_ctx;
>   	u8 num_comps;
> +	u8 pp_idx;
>   };
>   
>   struct mdp_dev;