From e07e5bde7c2386172994035603d5e2781cdf3bda Mon Sep 17 00:00:00 2001
From: Eric Gao <eric.gao@rock-chips.com>
Date: Tue, 2 May 2017 18:23:51 +0800
Subject: 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>

diff --git a/drivers/video/rockchip/rk_vop.c b/drivers/video/rockchip/rk_vop.c
index bc02f80..c12c24b 100644
--- a/drivers/video/rockchip/rk_vop.c
+++ b/drivers/video/rockchip/rk_vop.c
@@ -244,7 +244,7 @@ int rk_display_init(struct udevice *dev, ulong fbbase,
 	ret = clk_get_by_index(dev, 1, &clk);
 	if (!ret)
 		ret = clk_set_rate(&clk, timing.pixelclock.typ);
-	if (ret) {
+	if (IS_ERR_VALUE(ret)) {
 		debug("%s: Failed to set pixel clock: ret=%d\n", __func__, ret);
 		return ret;
 	}
-- 
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