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drm: sun4i: fix potential overflow when calculating DSI dotclock rate
When calculating DSI dotclock rate, the clock rate is first multiplied by 1000 (to convert kHz to Hz), then bit per pixel value, and finally divided by (lanes * 4). Putting the two multiplication at first makes it risky to overflow when the panel expected clock rate is >= 90MHz, which is possible at least on 1080p panel. Move the *1000 multiplication to the end to prevent overflow. Signed-off-by: Icenowy Zheng <firstname.lastname@example.org>
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