linux-kernel - Re: [PATCH v4 1/5] drm/mediatek: Use mailbox rx_callback instead of cmdq_task

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Date:   Tue, 26 Oct 2021 23:50:00 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     "jason-jh.lin" <jason-jh.lin@...iatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>, fshao@...omium.org,
        Nancy Lin <nancy.lin@...iatek.com>, singo.chang@...iatek.com
Subject: Re: [PATCH v4 1/5] drm/mediatek: Use mailbox rx_callback instead of cmdq_task_cb

Hi, Jason:

jason-jh.lin <jason-jh.lin@...iatek.com> 於 2021年10月26日 週二 下午1:29寫道：
>
> From: Chun-Kuang Hu <chunkuang.hu@...nel.org>
>
> rx_callback is a standard mailbox callback mechanism and could cover the
> function of proprietary cmdq_task_cb, so use the standard one instead of
> the proprietary one.

Reviewed-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>

>
> Signed-off-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
> Signed-off-by: jason-jh.lin <jason-jh.lin@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index a4e80e499674..369d3e68c0b6 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -4,6 +4,8 @@
>   */
>
>  #include <linux/clk.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/mailbox_controller.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/soc/mediatek/mtk-cmdq.h>
>  #include <linux/soc/mediatek/mtk-mmsys.h>
> @@ -222,9 +224,11 @@ struct mtk_ddp_comp *mtk_drm_ddp_comp_for_plane(struct drm_crtc *crtc,
>  }
>
>  #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> -static void ddp_cmdq_cb(struct cmdq_cb_data data)
> +static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
>  {
> -       cmdq_pkt_destroy(data.data);
> +       struct cmdq_cb_data *data = mssg;
> +
> +       cmdq_pkt_destroy(data->pkt);
>  }
>  #endif
>
> @@ -475,7 +479,12 @@ static void mtk_drm_crtc_update_config(struct mtk_drm_crtc *mtk_crtc,
>                 cmdq_pkt_wfe(cmdq_handle, mtk_crtc->cmdq_event, false);
>                 mtk_crtc_ddp_config(crtc, cmdq_handle);
>                 cmdq_pkt_finalize(cmdq_handle);
> -               cmdq_pkt_flush_async(cmdq_handle, ddp_cmdq_cb, cmdq_handle);
> +               dma_sync_single_for_device(mtk_crtc->cmdq_client->chan->mbox->dev,
> +                                          cmdq_handle->pa_base,
> +                                          cmdq_handle->cmd_buf_size,
> +                                          DMA_TO_DEVICE);
> +               mbox_send_message(mtk_crtc->cmdq_client->chan, cmdq_handle);
> +               mbox_client_txdone(mtk_crtc->cmdq_client->chan, 0);
>         }
>  #endif
>         mtk_crtc->config_updating = false;
> @@ -839,6 +848,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>         }
>
>         if (mtk_crtc->cmdq_client) {
> +               mtk_crtc->cmdq_client->client.rx_callback = ddp_cmdq_cb;
>                 ret = of_property_read_u32_index(priv->mutex_node,
>                                                  "mediatek,gce-events",
>                                                  drm_crtc_index(&mtk_crtc->base),
> --
> 2.18.0
>