linux-kernel - [PATCH v1] drm/mediatek: move page flip handle into cmdq cb

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Date:   Fri, 19 Feb 2021 17:54:12 +0800
From:   Yongqiang Niu <yongqiang.niu@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>
Subject: [PATCH v1] drm/mediatek: move page flip handle into cmdq cb

move page flip handle into cmdq cb
irq callback will before cmdq flush ddp register
into hardware, that will cause the display frame page
flip event before it realy display out time

Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 33 +++++++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index bdd37ea..bece327 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -72,6 +72,13 @@ struct mtk_crtc_state {
 	unsigned int			pending_vrefresh;
 };
 
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+struct mtk_cmdq_cb_data {
+	struct cmdq_pkt			*cmdq_handle;
+	struct mtk_drm_crtc		*mtk_crtc;
+};
+#endif
+
 static inline struct mtk_drm_crtc *to_mtk_crtc(struct drm_crtc *c)
 {
 	return container_of(c, struct mtk_drm_crtc, base);
@@ -96,7 +103,6 @@ static void mtk_drm_crtc_finish_page_flip(struct mtk_drm_crtc *mtk_crtc)
 
 static void mtk_drm_finish_page_flip(struct mtk_drm_crtc *mtk_crtc)
 {
-	drm_crtc_handle_vblank(&mtk_crtc->base);
 	if (mtk_crtc->pending_needs_vblank) {
 		mtk_drm_crtc_finish_page_flip(mtk_crtc);
 		mtk_crtc->pending_needs_vblank = false;
@@ -241,7 +247,19 @@ 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)
 {
-	cmdq_pkt_destroy(data.data);
+	struct mtk_cmdq_cb_data *cb_data = data.data;
+
+	if (cb_data) {
+		struct mtk_drm_crtc *mtk_crtc = cb_data->mtk_crtc;
+
+		if (mtk_crtc)
+			mtk_drm_finish_page_flip(mtk_crtc);
+
+		if (cb_data->cmdq_handle)
+			cmdq_pkt_destroy(cb_data->cmdq_handle);
+
+		kfree(cb_data);
+	}
 }
 #endif
 
@@ -481,13 +499,20 @@ static void mtk_drm_crtc_hw_config(struct mtk_drm_crtc *mtk_crtc)
 	}
 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
 	if (mtk_crtc->cmdq_client) {
+		struct mtk_cmdq_cb_data *cb_data;
+
 		mbox_flush(mtk_crtc->cmdq_client->chan, 2000);
 		cmdq_handle = cmdq_pkt_create(mtk_crtc->cmdq_client, 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);
 		cmdq_pkt_finalize(cmdq_handle);
-		cmdq_pkt_flush_async(cmdq_handle, ddp_cmdq_cb, cmdq_handle);
+
+		cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL);
+		cb_data->cmdq_handle = cmdq_handle;
+		cb_data->mtk_crtc = mtk_crtc;
+
+		cmdq_pkt_flush_async(cmdq_handle, ddp_cmdq_cb, cb_data);
 	}
 #endif
 	mutex_unlock(&mtk_crtc->hw_lock);
@@ -674,7 +699,7 @@ void mtk_crtc_ddp_irq(struct drm_crtc *crtc, struct mtk_ddp_comp *comp)
 #endif
 		mtk_crtc_ddp_config(crtc, NULL);
 
-	mtk_drm_finish_page_flip(mtk_crtc);
+	drm_crtc_handle_vblank(&mtk_crtc->base);
 }
 
 static int mtk_drm_crtc_num_comp_planes(struct mtk_drm_crtc *mtk_crtc,
-- 
1.8.1.1.dirty