[PATCH v3 0/2] Fix mediatek-drm suspend and resume issue

[PATCH v3 0/2] Fix mediatek-drm suspend and resume issue

[jason-jh.lin]

Change in v3:
- fix return typo: modify -NOEDV to -ENODEV.
- add missing complete function in ddp_cmdq_cb.

Change in v2:
- rollback adding cmdq_mbox_flush in cmdq_suspend and add
  blocking config mode for mtk_drm_crtc_atomic_disable.
- add return error when device_link_add fail.
- change the first parameter of device_link_add from dev
  to priv->dev.

jason-jh.lin (2):
  drm/mediatek: add blocking config mode for crtc disable flow
  drm/mediatek: add devlink to cmdq dev

 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 31 ++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

-- 
2.18.0


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[PATCH v3 1/2] drm/mediatek: add blocking config mode for crtc disable flow

[jason-jh.lin]

mtk_drm_crtc_atomic_disable will send an async cmd to cmdq driver,
so it may not finish when cmdq_suspend is called sometimes.

Change async cmd to blocking cmd for mtk_drm_crtc_atomic_disable
to make sure the lastest cmd is done before cmdq_suspend.

Signed-off-by: jason-jh.lin <jason-jh.lin@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 62529a954b62..6ca96802fd77 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -56,6 +56,8 @@ struct mtk_drm_crtc {
 	struct cmdq_pkt			cmdq_handle;
 	u32				cmdq_event;
 	u32				cmdq_vblank_cnt;
+	bool				blocking_config;
+	struct completion		cmplt;
 #endif
 
 	struct device			*mmsys_dev;
@@ -314,6 +316,9 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
 	}
 
 	mtk_crtc->cmdq_vblank_cnt = 0;
+
+	if (mtk_crtc->blocking_config)
+		complete(&mtk_crtc->cmplt);
 }
 #endif
 
@@ -584,8 +589,16 @@ static void mtk_drm_crtc_update_config(struct mtk_drm_crtc *mtk_crtc,
 		 */
 		mtk_crtc->cmdq_vblank_cnt = 3;
 
+		if (mtk_crtc->blocking_config)
+			init_completion(&mtk_crtc->cmplt);
+
 		mbox_send_message(mtk_crtc->cmdq_client.chan, cmdq_handle);
 		mbox_client_txdone(mtk_crtc->cmdq_client.chan, 0);
+
+		if (mtk_crtc->blocking_config) {
+			wait_for_completion(&mtk_crtc->cmplt);
+			mtk_crtc->blocking_config = false;
+		}
 	}
 #endif
 	mtk_crtc->config_updating = false;
@@ -698,7 +711,9 @@ static void mtk_drm_crtc_atomic_disable(struct drm_crtc *crtc,
 		plane_state->pending.config = true;
 	}
 	mtk_crtc->pending_planes = true;
-
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+	mtk_crtc->blocking_config = true;
+#endif
 	mtk_drm_crtc_update_config(mtk_crtc, false);
 	/* Wait for planes to be disabled */
 	drm_crtc_wait_one_vblank(crtc);
-- 
2.18.0


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[PATCH v3 2/2] drm/mediatek: add devlink to cmdq dev

[jason-jh.lin]

Add devlink to cmdq to make sure the order of suspend and resume
is correct.

Signed-off-by: jason-jh.lin <jason-jh.lin@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 6ca96802fd77..88b57a20f26d 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -61,6 +61,7 @@ struct mtk_drm_crtc {
 #endif
 
 	struct device			*mmsys_dev;
+	struct device			*drm_dev;
 	struct mtk_mutex		*mutex;
 	unsigned int			ddp_comp_nr;
 	struct mtk_ddp_comp		**ddp_comp;
@@ -160,6 +161,7 @@ static void mtk_drm_crtc_destroy(struct drm_crtc *crtc)
 	mtk_drm_cmdq_pkt_destroy(&mtk_crtc->cmdq_handle);
 
 	if (mtk_crtc->cmdq_client.chan) {
+		device_link_remove(mtk_crtc->drm_dev, mtk_crtc->cmdq_client.chan->mbox->dev);
 		mbox_free_channel(mtk_crtc->cmdq_client.chan);
 		mtk_crtc->cmdq_client.chan = NULL;
 	}
@@ -908,6 +910,7 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
 		return -ENOMEM;
 
 	mtk_crtc->mmsys_dev = priv->mmsys_dev;
+	mtk_crtc->drm_dev = priv->dev;
 	mtk_crtc->ddp_comp_nr = path_len;
 	mtk_crtc->ddp_comp = devm_kmalloc_array(dev, mtk_crtc->ddp_comp_nr,
 						sizeof(*mtk_crtc->ddp_comp),
@@ -975,6 +978,17 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
 	}
 
 	if (mtk_crtc->cmdq_client.chan) {
+		struct device_link *link;
+
+		/* add devlink to cmdq dev to make sure suspend/resume order is correct */
+		link = device_link_add(priv->dev, mtk_crtc->cmdq_client.chan->mbox->dev,
+				       DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);
+		if (!link) {
+			dev_err(priv->dev, "Unable to link dev=%s\n",
+				dev_name(mtk_crtc->cmdq_client.chan->mbox->dev));
+			return -ENODEV;
+		}
+
 		ret = of_property_read_u32_index(priv->mutex_node,
 						 "mediatek,gce-events",
 						 i,
-- 
2.18.0


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