tree 6550d24877f04a0cbe8cbadd0b262b367aa2bc3b
parent 4789bc14fe5f5fbd1cc648e738981c38047f07a7
author Eric Gao <eric.gao@rock-chips.com> 1493720631 +0800
committer Simon Glass <sjg@chromium.org> 1494445042 -0600

rockchip: video: vop: Fix rk_display_init() return error

It's caused by the difference of clk_set_rate function implement between
rk3288 andd rk3399.

clk_set_rate() of rk3288 return 0 in normal condition.
clk_set_rate() of rk3399 return input parameter in normal condition.

So check clk_set_rate's return value by IS_ERR_VALUE.

Signed-off-by: Eric Gao <eric.gao@rock-chips.com>