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For RK3399, the grf clk should be enabled before writing grf registers, otherwise the register value can not be changed. Signed-off-by: Chris Zhong <zyw@rock-chips.com> Reviewed-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Sean Paul <seanpaul@chromium.org> Link: http://patchwork.freedesktop.org/patch/msgid/1490147691-4489-4-git-send-email-zyw@rock-chips.com