[PATCH v1] drm/mediatek: add dma buffer control for drm plane disable

[Yongqiang Niu]

get dma buffer when drm plane disable
put dma buffer when overlay really disable

Signed-off-by: Yongqiang Niu <yongqiang....@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c  | 11 +++++++++++
 drivers/gpu/drm/mediatek/mtk_drm_plane.c | 12 ++++++++++++
 drivers/gpu/drm/mediatek/mtk_drm_plane.h |  1 +
 3 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c 
b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 112615817dcb..1b1341b57d62 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/dma-buf.h>
 #include <linux/dma-mapping.h>
 #include <linux/mailbox_controller.h>
 #include <linux/pm_runtime.h>
@@ -283,6 +284,14 @@ struct mtk_ddp_comp *mtk_drm_ddp_comp_for_plane(struct 
drm_crtc *crtc,
 }
 
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
+static void mtk_drm_dma_buf_put(struct mtk_plane_state *plane_state)
+{
+       if (plane_state && plane_state->pending.dma_buf) {
+               dma_buf_put(plane_state->pending.dma_buf);
+               plane_state->pending.dma_buf = NULL;
+       }
+}
+
 static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
 {
        struct cmdq_cb_data *data = mssg;
@@ -306,6 +315,7 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
                        plane_state = to_mtk_plane_state(plane->state);
 
                        plane_state->pending.config = false;
+                       mtk_drm_dma_buf_put(plane_state);
                }
                mtk_crtc->pending_planes = false;
        }
@@ -318,6 +328,7 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
                        plane_state = to_mtk_plane_state(plane->state);
 
                        plane_state->pending.async_config = false;
+                       mtk_drm_dma_buf_put(plane_state);
                }
                mtk_crtc->pending_async_planes = false;
        }
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c 
b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
index 2f5e007dd380..b67fdf12e237 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
@@ -11,6 +11,7 @@
 #include <drm/drm_fourcc.h>
 #include <drm/drm_framebuffer.h>
 #include <drm/drm_gem_atomic_helper.h>
+#include <linux/dma-buf.h>
 
 #include "mtk_drm_crtc.h"
 #include "mtk_drm_ddp_comp.h"
@@ -212,6 +213,17 @@ static void mtk_plane_atomic_disable(struct drm_plane 
*plane,
        struct drm_plane_state *new_state = 
drm_atomic_get_new_plane_state(state,
                                                                           
plane);
        struct mtk_plane_state *mtk_plane_state = to_mtk_plane_state(new_state);
+       struct drm_plane_state *old_state = 
drm_atomic_get_old_plane_state(state,
+                                                                          
plane);
+
+       if (old_state && old_state->fb) {
+               struct drm_gem_object *gem = old_state->fb->obj[0];
+
+               if (gem && gem->dma_buf) {
+                       get_dma_buf(gem->dma_buf);
+                       mtk_plane_state->pending.dma_buf = gem->dma_buf;
+               }
+       }
        mtk_plane_state->pending.enable = false;
        wmb(); /* Make sure the above parameter is set before update */
        mtk_plane_state->pending.dirty = true;
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.h 
b/drivers/gpu/drm/mediatek/mtk_drm_plane.h
index 2d5ec66e3df1..e0985b107c36 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_plane.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.h
@@ -25,6 +25,7 @@ struct mtk_plane_pending_state {
        bool                            async_dirty;
        bool                            async_config;
        enum drm_color_encoding         color_encoding;
+       struct dma_buf                  *dma_buf;
 };
 
 struct mtk_plane_state {
-- 
2.25.1