[PATCH 2/5] Revert "drm/mediatek: Add cmdq_handle in mtk_crtc"

[Chun-Kuang Hu]

This reverts commit bc9241be73d9b2b3bcb7033598521fd669639848.

Commit c1ec54b7b5af
("drm/mediatek: Use mailbox rx_callback instead of cmdq_task_cb")
would cause numerous mtk cmdq mailbox driver warning:

WARNING: CPU: 0 PID: 0 at drivers/mailbox/mtk-cmdq-mailbox.c:198
cmdq_task_exec_done+0xb8/0xe0

So revert that patch and all the patches depend on that patch.

Reported-by: Enric Balletbo Serra <eballe...@gmail.com>
Signed-off-by: Chun-Kuang Hu <chunkuang...@kernel.org>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 28 +++++++++----------------
 1 file changed, 10 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c 
b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 9840b8d035dc..697c4dec1890 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -54,7 +54,6 @@ 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
@@ -227,16 +226,19 @@ struct mtk_ddp_comp *mtk_drm_ddp_comp_for_plane(struct 
drm_crtc *crtc,
 }
 
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
-static int mtk_drm_cmdq_pkt_create(struct mbox_chan *chan, struct cmdq_pkt 
*pkt,
-                                   size_t size)
+static struct cmdq_pkt *mtk_drm_cmdq_pkt_create(struct mbox_chan *chan, 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 -ENOMEM;
+               return ERR_PTR(-ENOMEM);
        }
        pkt->buf_size = size;
 
@@ -247,12 +249,12 @@ static int mtk_drm_cmdq_pkt_create(struct mbox_chan 
*chan, struct cmdq_pkt *pkt,
                dev_err(dev, "dma map failed, size=%u\n", (u32)(u64)size);
                kfree(pkt->va_base);
                kfree(pkt);
-               return -ENOMEM;
+               return ERR_PTR(-ENOMEM);
        }
 
        pkt->pa_base = dma_addr;
 
-       return 0;
+       return pkt;
 }
 
 static void mtk_drm_cmdq_pkt_destroy(struct mbox_chan *chan, struct cmdq_pkt 
*pkt)
@@ -475,7 +477,7 @@ 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 = &mtk_crtc->cmdq_handle;
+       struct cmdq_pkt *cmdq_handle;
 #endif
        struct drm_crtc *crtc = &mtk_crtc->base;
        struct mtk_drm_private *priv = crtc->dev->dev_private;
@@ -515,7 +517,7 @@ 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->cmd_buf_size = 0;
+               cmdq_handle = mtk_drm_cmdq_pkt_create(mtk_crtc->cmdq_chan, 
PAGE_SIZE);
                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);
@@ -910,16 +912,6 @@ 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
-- 
2.25.1