drm/mediatek: Add cmdq_handle in mtk_crtc

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.

Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 7aea658..5be5ea7 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -54,6 +54,7 @@ struct mtk_drm_crtc {
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
        struct mbox_client              cmdq_cl;
        struct mbox_chan                *cmdq_chan;
+       struct cmdq_pkt                 cmdq_handle;
        u32                             cmdq_event;
        u32                             cmdq_vblank_cnt;
 #endif
@@ -226,19 +227,16 @@ struct mtk_ddp_comp *mtk_drm_ddp_comp_for_plane(struct drm_crtc *crtc,
 }
 
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
-static struct cmdq_pkt *mtk_drm_cmdq_pkt_create(struct mbox_chan *chan, size_t size)
+static int mtk_drm_cmdq_pkt_create(struct mbox_chan *chan, struct cmdq_pkt *pkt,
+                                   size_t size)
 {
-       struct cmdq_pkt *pkt;
        struct device *dev;
        dma_addr_t dma_addr;
 
-       pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
-       if (!pkt)
-               return ERR_PTR(-ENOMEM);
        pkt->va_base = kzalloc(size, GFP_KERNEL);
        if (!pkt->va_base) {
                kfree(pkt);
-               return ERR_PTR(-ENOMEM);
+               return -ENOMEM;
        }
        pkt->buf_size = size;
 
@@ -249,12 +247,12 @@ static struct cmdq_pkt *mtk_drm_cmdq_pkt_create(struct mbox_chan *chan, size_t s
                dev_err(dev, "dma map failed, size=%u\n", (u32)(u64)size);
                kfree(pkt->va_base);
                kfree(pkt);
-               return ERR_PTR(-ENOMEM);
+               return -ENOMEM;
        }
 
        pkt->pa_base = dma_addr;
 
-       return pkt;
+       return 0;
 }
 
 static void mtk_drm_cmdq_pkt_destroy(struct mbox_chan *chan, struct cmdq_pkt *pkt)
@@ -477,7 +475,7 @@ 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;
@@ -517,7 +515,7 @@ static void mtk_drm_crtc_update_config(struct mtk_drm_crtc *mtk_crtc,
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
        if (mtk_crtc->cmdq_chan) {
                mbox_flush(mtk_crtc->cmdq_chan, 2000);
-               cmdq_handle = mtk_drm_cmdq_pkt_create(mtk_crtc->cmdq_chan, 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);
@@ -915,6 +913,16 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
                                drm_crtc_index(&mtk_crtc->base));
                        mbox_free_channel(mtk_crtc->cmdq_chan);
                        mtk_crtc->cmdq_chan = NULL;
+               } else {
+                       ret = mtk_drm_cmdq_pkt_create(mtk_crtc->cmdq_chan,
+                                                      &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_chan);
+                               mtk_crtc->cmdq_chan = NULL;
+                       }
                }
        }
 #endif