[PATCH v13 14/22] drm/mediatek: add display merge async reset control

From: Nancy.Lin <nancy.lin@mediatek.com>
To: CK Hu <ck.hu@mediatek.com>
Cc: Chun-Kuang Hu <chunkuang.hu@kernel.org>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Rob Herring <robh+dt@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	"jason-jh . lin" <jason-jh.lin@mediatek.com>,
	"Nancy . Lin" <nancy.lin@mediatek.com>,
	Yongqiang Niu <yongqiang.niu@mediatek.com>,
	<dri-devel@lists.freedesktop.org>,
	<linux-mediatek@lists.infradead.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<singo.chang@mediatek.com>, <srv_heupstream@mediatek.com>
Subject: [PATCH v13 14/22] drm/mediatek: add display merge async reset control
Date: Tue, 8 Mar 2022 14:20:04 +0800	[thread overview]
Message-ID: <20220308062012.21838-15-nancy.lin@mediatek.com> (raw)
In-Reply-To: <20220308062012.21838-1-nancy.lin@mediatek.com>

Add merge async reset control in mtk_merge_stop. Async hw doesn't do self
reset on each sof signal(start of frame), so need to reset the async to
clear the hw status for the next merge start.

Signed-off-by: Nancy.Lin <nancy.lin@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_merge.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_merge.c b/drivers/gpu/drm/mediatek/mtk_disp_merge.c
index 9dca145cfb71..177473fa8160 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_merge.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_merge.c
@@ -8,6 +8,7 @@
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
 #include <linux/platform_device.h>
+#include <linux/reset.h>
 #include <linux/soc/mediatek/mtk-cmdq.h>
 
 #include "mtk_drm_ddp_comp.h"
@@ -79,6 +80,9 @@ void mtk_merge_stop(struct device *dev)
 	struct mtk_disp_merge *priv = dev_get_drvdata(dev);
 
 	mtk_merge_stop_cmdq(dev, NULL);
+
+	if (priv->async_clk)
+		device_reset_optional(dev);
 }
 
 void mtk_merge_start_cmdq(struct device *dev, struct cmdq_pkt *cmdq_pkt)
-- 
2.18.0


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