linux-kernel - [PATCH 2/2] drm/rockchip: vop: set vop enabled after enable iommu

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Date:	Thu, 22 Jan 2015 15:05:33 +0800
From:	Mark Yao <mark.yao@...k-chips.com>
To:	David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Daniel Kurtz <djkurtz@...omium.org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org
Cc:	Mark Yao <mark.yao@...k-chips.com>
Subject: [PATCH 2/2] drm/rockchip: vop: set vop enabled after enable iommu

there is a Bug that:
  vop_enable()->drm_vblank_on, drm_vblank_on may call vop
enable vblank. if it happen, vblank enable would failed,
then cause irq status error. because is_enabled value is set
after drm_vblank_on.

after enable vop clocks and iommu regs, we can sure that
R/W vop regs and do vop plane flip is safe, so place
is_enabled = true after enable iommu is suitable.

Signed-off-by: Mark Yao <mark.yao@...k-chips.com>
---
 drivers/gpu/drm/rockchip/rockchip_drm_vop.c |   11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index f278c09..a009457 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -420,6 +420,11 @@ static void vop_enable(struct drm_crtc *crtc)
 		goto err_disable_aclk;
 	}
 
+	/*
+	 * At here, vop clock & iommu is enable, R/W vop regs would be safe.
+	 */
+	vop->is_enabled = false;
+
 	spin_lock(&vop->reg_lock);
 
 	VOP_CTRL_SET(vop, standby, 0);
@@ -430,8 +435,6 @@ static void vop_enable(struct drm_crtc *crtc)
 
 	drm_vblank_on(vop->drm_dev, vop->pipe);
 
-	vop->is_enabled = false;
-
 	return;
 
 err_disable_aclk:
@@ -462,6 +465,8 @@ static void vop_disable(struct drm_crtc *crtc)
 	VOP_CTRL_SET(vop, standby, 1);
 
 	spin_unlock(&vop->reg_lock);
+
+	vop->is_enabled = false;
 	/*
 	 * disable dclk to stop frame scan, so we can safely detach iommu,
 	 */
@@ -471,8 +476,6 @@ static void vop_disable(struct drm_crtc *crtc)
 
 	clk_disable(vop->aclk);
 	clk_disable(vop->hclk);
-
-	vop->is_enabled = false;
 }
 
 /*
-- 
1.7.9.5


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