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Commit b74d921b authored by Rex-BC Chen's avatar Rex-BC Chen Committed by Chun-Kuang Hu
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drm/mediatek: Add vblank register/unregister callback functions

We encountered a kernel panic issue that callback data will be NULL when
it's using in ovl irq handler. There is a timing issue between
mtk_disp_ovl_irq_handler() and mtk_ovl_disable_vblank().

To resolve this issue, we use the flow to register/unregister vblank cb:
- Register callback function and callback data when crtc creates.
- Unregister callback function and callback data when crtc destroies.

With this solution, we can assure callback data will not be NULL when
vblank is disable.

Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20220321072320.15019-1-rex-bc.chen@mediatek.com/


Fixes: 9b070498 ("drm/mediatek: Register vblank callback function")
Signed-off-by: default avatarRex-BC Chen <rex-bc.chen@mediatek.com>
Reviewed-by: default avatarjason-jh.lin <jason-jh.lin@mediatek.com>
Signed-off-by: default avatarChun-Kuang Hu <chunkuang.hu@kernel.org>
parent 07fb1e5b
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