osd: support dim color debugging and blank functions for legacy viu2 osd [1/1]

PD#SWPL-145446

Problem:
dim color debugging and blank functions are not supported

Solution:
add this support

Verify:
t5d

Change-Id: Iceebb81648264e96848adb9d2a870ecc5c5fc30e
Signed-off-by: Jian Cao <jian.cao@amlogic.com>

drivers/media/osd/osd_fb.c

@@ -4468,6 +4468,8 @@ static struct device_attribute osd_attrs_viu2[] = {
 	       show_fence_count, NULL),
 	__ATTR(game_mode, 0644,
 	       show_game_mode, store_game_mode),
+	__ATTR(force_dim, 0644,
+	       show_force_dimm, store_force_dimm),
 };
 
 #ifdef CONFIG_PM

drivers/media/osd/osd_hw.c

@@ -13603,6 +13603,12 @@ static void osd_setting_viux(u32 output_index)
 				osd_hw.reg[OSD_ENABLE]
 				.update_func(index);
 		}
+		/* if osd is disabled, use black dim color */
+		if (osd_hw.enable[index] == DISABLE) {
+			osd_hw.dim_layer[index] = 1;
+			osd_hw.dim_color[index] = 0;
+		}
+
 		if (!osd_hw.dim_layer[index]) {
 			VSYNCOSD_WR_MPEG_REG(osd_reg->osd_dimm_ctrl,
 					     0x00000000);