drm/rockchip: return a true clock rate to adjusted_mode
Since the mipi dsi driver need to use the clock of vop to make the calculation of Blanking. But sometimes the clock driver can not set a accurate clock_rate for vop, get it by clk_round_rate before mode_set, so we can get the true value. Signed-off-by: Chris Zhong <zyw@rock-chips.com> Acked-by: Mark Yao <mark.yao@rock-chips.com>
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