drm/rockchip/dsi: enable the grf clk before writing grf registers
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
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