From: zwl <zwl@rock-chips.com>
Date: Thu, 19 Jun 2014 13:05:45 +0000 (+0800)
Subject: rk fb: modify get_prmry_screen_ft in case ft is zero
X-Git-Tag: firefly_0821_release~5067
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8c3548e466a573f96f810014f01a3fa6eac27325;p=firefly-linux-kernel-4.4.55.git

rk fb: modify get_prmry_screen_ft in case ft is zero
---

diff --git a/drivers/video/rockchip/rk_fb.c b/drivers/video/rockchip/rk_fb.c
index ece4d7c6111c..1713adda87b4 100755
--- a/drivers/video/rockchip/rk_fb.c
+++ b/drivers/video/rockchip/rk_fb.c
@@ -525,7 +525,10 @@ u32 rk_fb_get_prmry_screen_ft(void)
 
 	ft_us = dev_drv->frame_time.framedone_t - dev_drv->frame_time.last_framedone_t;
 	do_div(ft_us, 1000);
-	dev_drv->frame_time.ft = min(dev_drv->frame_time.ft, (u32)ft_us);
+	ft_us = min(dev_drv->frame_time.ft, (u32)ft_us);
+	if (ft_us != 0)
+		dev_drv->frame_time.ft = ft_us;
+
 	return dev_drv->frame_time.ft;
 }