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 ece4d7c6111c7b1cd2814b8be9e242126f30c612..1713adda87b4c0b93ea4e8b2711413a169d368aa 100755 (executable)
--- 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;
 }