rk fb: fix rk_fb_get_prmry_screen_ft cal error

diff --git a/drivers/video/rockchip/rk_fb.c b/drivers/video/rockchip/rk_fb.c
index 905b3195119feacefd20e01d5e188363b3b8204e..9e94ea056722c1a26f42af6e43fad7d1eaaf6033 100755 (executable)
--- a/drivers/video/rockchip/rk_fb.c
+++ b/drivers/video/rockchip/rk_fb.c
@@ -528,20 +528,19 @@ static struct rk_lcdc_driver *rk_get_prmry_lcdc_drv(void)
 int rk_fb_get_prmry_screen_ft(void)
 {
        struct rk_lcdc_driver *dev_drv = rk_get_prmry_lcdc_drv();
-       uint32_t htotal, vtotal, pix_total, ft_us, dclk_mhz;
+       uint32_t htotal, vtotal, pix_total, ft_us, pixclock_ns;
 
        if (unlikely(!dev_drv))
                return 0;
 
-       dclk_mhz = dev_drv->pixclock/(1000*1000);
+       pixclock_ns = dev_drv->pixclock/1000;
 
        htotal = (dev_drv->cur_screen->mode.upper_margin + dev_drv->cur_screen->mode.lower_margin +
                dev_drv->cur_screen->mode.yres + dev_drv->cur_screen->mode.vsync_len);
        vtotal = (dev_drv->cur_screen->mode.left_margin + dev_drv->cur_screen->mode.right_margin +
                dev_drv->cur_screen->mode.xres + dev_drv->cur_screen->mode.hsync_len);
-       pix_total = htotal*vtotal;
-       ft_us = pix_total / dclk_mhz;
-
+       pix_total = htotal*vtotal/1000;
+       ft_us = pix_total * pixclock_ns;
        return ft_us;
 }