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drm/rockchip: px30 vop: fix iommu pagefault when disable win2

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In the bandwidth tension environment when close win2, vop will access
the freed memory lead to iommu pagefault. so we add this reset to workaround.

Change-Id: I22b0c0f145d042e3aaf98fb45ffff6304c93963c
Signed-off-by: Sandy Huang <hjc@rock-chips.com>
This commit is contained in:
Sandy Huang
2018-03-07 15:09:13 +08:00
parent 50b9027229
commit d3cc85847c
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/rockchip/rockchip_drm_vop.c
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@@ -1561,6 +1561,15 @@ static void vop_plane_atomic_disable(struct drm_plane *plane,
if (win->area_id == 0)
VOP_WIN_SET(vop, win, gate, 0);
/*
* IC design bug: in the bandwidth tension environment when close win2,
* vop will access the freed memory lead to iommu pagefault.
* so we add this reset to workaround.
*/
if (VOP_MAJOR(vop->version) == 2 && VOP_MINOR(vop->version) == 5 &&
win->win_id == 2)
VOP_WIN_SET(vop, win, yrgb_mst, 0);
spin_unlock(&vop->reg_lock);
vop_plane_state->enable = false;