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drm/mediatek: Add vblank register/unregister callback functions
[ Upstream commit b74d921 ] 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: 9b07049 ("drm/mediatek: Register vblank callback function") Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com> Reviewed-by: jason-jh.lin <jason-jh.lin@mediatek.com> Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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