rk312x:lcdc: fix the color gradation of screen display if use dither down mode when...

diff --git a/drivers/video/rockchip/lcdc/rk312x_lcdc.c b/drivers/video/rockchip/lcdc/rk312x_lcdc.c
index 0c629252cf2c55aa20dd485e7fafe94380f9b847..7dbdac938d002141672e6e65b8633c28c228fe17 100755 (executable)
--- a/drivers/video/rockchip/lcdc/rk312x_lcdc.c
+++ b/drivers/video/rockchip/lcdc/rk312x_lcdc.c
@@ -1547,8 +1547,20 @@ static int rk312x_lcdc_early_resume(struct rk_lcdc_driver *dev_drv)
        if (lcdc_dev->atv_layer_cnt) {
                rk312x_lcdc_clk_enable(lcdc_dev);
                rk312x_lcdc_reg_restore(lcdc_dev);
+
+               /* config for the FRC mode of dither down */
+               if (dev_drv->cur_screen &&
+                   dev_drv->cur_screen->face != OUT_P888) {
+                       lcdc_writel(lcdc_dev, FRC_LOWER01_0, 0x12844821);
+                       lcdc_writel(lcdc_dev, FRC_LOWER01_1, 0x21488412);
+                       lcdc_writel(lcdc_dev, FRC_LOWER10_0, 0x55aaaa55);
+                       lcdc_writel(lcdc_dev, FRC_LOWER10_1, 0x55aaaa55);
+                       lcdc_writel(lcdc_dev, FRC_LOWER11_0, 0xdeb77deb);
+                       lcdc_writel(lcdc_dev, FRC_LOWER11_1, 0xed7bb7de);
+               }
+
                 /* set screen lut */
-               if (dev_drv->cur_screen->dsp_lut)
+               if (dev_drv->cur_screen && dev_drv->cur_screen->dsp_lut)
                        rk312x_lcdc_set_lut(dev_drv);
                /*set hwc lut*/
                rk312x_lcdc_set_hwc_lut(dev_drv, dev_drv->hwc_lut, 0);