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Date: Thu, 28 Oct 2021 07:32:29 +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 v5 4/6] drm/mediatek: Add cmdq_handle in mtk_crtc
Hi, Jason:
jason-jh.lin <jason-jh.lin@...iatek.com> 於 2021年10月27日 週三 上午10:19寫道：
>
> From: Chun-Kuang Hu <chunkuang.hu@...nel.org>
>
> One mtk_crtc need just one cmdq_handle, so add one cmdq_handle
> in mtk_crtc to prevent frequently allocation and free of
> cmdq_handle.
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 | 62 +++++++++++++++++++++++--
> 1 file changed, 57 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index dad1f85ee315..ffa54b416ca7 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -53,6 +53,7 @@ struct mtk_drm_crtc {
>
> #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> struct cmdq_client cmdq_client;
> + struct cmdq_pkt cmdq_handle;
> u32 cmdq_event;
> u32 cmdq_vblank_cnt;
> #endif
> @@ -107,12 +108,55 @@ static void mtk_drm_finish_page_flip(struct mtk_drm_crtc *mtk_crtc)
> }
> }
>
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> +static int mtk_drm_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) {
> + kfree(pkt);
> + return -ENOMEM;
> + }
> + pkt->buf_size = size;
> + pkt->cl = (void *)client;
> +
> + 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);
> + kfree(pkt);
> + return -ENOMEM;
> + }
> +
> + pkt->pa_base = dma_addr;
> +
> + return 0;
> +}
> +
> +static void mtk_drm_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);
> + kfree(pkt);
> +}
> +#endif
> +
> static void mtk_drm_crtc_destroy(struct drm_crtc *crtc)
> {
> struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
>
> mtk_mutex_put(mtk_crtc->mutex);
> -
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> + mtk_drm_cmdq_pkt_destroy(&mtk_crtc->cmdq_handle);
> +#endif
> drm_crtc_cleanup(crtc);
> }
>
> @@ -227,12 +271,10 @@ 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 mbox_client *cl, void *mssg)
> {
> - struct cmdq_cb_data *data = mssg;
> struct cmdq_client *cmdq_cl = container_of(cl, struct cmdq_client, client);
> struct mtk_drm_crtc *mtk_crtc = container_of(cmdq_cl, struct mtk_drm_crtc, cmdq_client);
>
> mtk_crtc->cmdq_vblank_cnt = 0;
> - cmdq_pkt_destroy(data->pkt);
> }
> #endif
>
> @@ -438,7 +480,7 @@ static void mtk_drm_crtc_update_config(struct mtk_drm_crtc *mtk_crtc,
> bool needs_vblank)
> {
> #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> - struct cmdq_pkt *cmdq_handle;
> + struct cmdq_pkt *cmdq_handle = &mtk_crtc->cmdq_handle;
> #endif
> struct drm_crtc *crtc = &mtk_crtc->base;
> struct mtk_drm_private *priv = crtc->dev->dev_private;
> @@ -478,7 +520,7 @@ static void mtk_drm_crtc_update_config(struct mtk_drm_crtc *mtk_crtc,
> #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> if (mtk_crtc->cmdq_client.chan) {
> mbox_flush(mtk_crtc->cmdq_client.chan, 2000);
> - cmdq_handle = cmdq_pkt_create(&mtk_crtc->cmdq_client, PAGE_SIZE);
> + cmdq_handle->cmd_buf_size = 0;
> cmdq_pkt_clear_event(cmdq_handle, mtk_crtc->cmdq_event);
> cmdq_pkt_wfe(cmdq_handle, mtk_crtc->cmdq_event, false);
> mtk_crtc_ddp_config(crtc, cmdq_handle);
> @@ -877,6 +919,16 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> drm_crtc_index(&mtk_crtc->base));
> mbox_free_channel(mtk_crtc->cmdq_client.chan);
> mtk_crtc->cmdq_client.chan = NULL;
> + } else {
> + ret = mtk_drm_cmdq_pkt_create(&mtk_crtc->cmdq_client,
> + &mtk_crtc->cmdq_handle,
> + PAGE_SIZE);
> + if (ret) {
> + dev_dbg(dev, "mtk_crtc %d failed to create cmdq packet\n",
> + drm_crtc_index(&mtk_crtc->base));
> + mbox_free_channel(mtk_crtc->cmdq_client.chan);
> + mtk_crtc->cmdq_client.chan = NULL;
> + }
> }
> }
> #endif
> --
> 2.18.0
>
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