drm/mediatek: support CMDQ interface in ddp component
The CMDQ (Command Queue) in some Mediatek SoC is used to help update all relevant display controller registers with critical time limation. This patch add cmdq interface in ddp_comp interface, let all ddp_comp interface can support cpu/cmdq function at the same time. Signed-off-by: YT Shen <yt.shen@mediatek.com> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com> Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com> Signed-off-by: CK Hu <ck.hu@mediatek.com>
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