[media] media: ti-vpe: vpdma: Add helper to set a background color

Add a helper to set the background color during vpdma transfer.
This is needed when VPDMA is generating 32 bits RGB format
to have the Alpha channel set to an appropriate value.
Signed-off-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/ti-vpe/vpdma.c

@@ -867,6 +867,16 @@ void vpdma_clear_list_stat(struct vpdma_data *vpdma, int irq_num)
 }
 EXPORT_SYMBOL(vpdma_clear_list_stat);
 
+void vpdma_set_bg_color(struct vpdma_data *vpdma,
+		struct vpdma_data_format *fmt, u32 color)
+{
+	if (fmt->type == VPDMA_DATA_FMT_TYPE_RGB)
+		write_reg(vpdma, VPDMA_BG_RGB, color);
+	else if (fmt->type == VPDMA_DATA_FMT_TYPE_YUV)
+		write_reg(vpdma, VPDMA_BG_YUV, color);
+}
+EXPORT_SYMBOL(vpdma_set_bg_color);
+
 /*
  * configures the output mode of the line buffer for the given client, the
  * line buffer content can either be mirrored(each line repeated twice) or

drivers/media/platform/ti-vpe/vpdma.h

@@ -221,7 +221,8 @@ void vpdma_set_line_mode(struct vpdma_data *vpdma, int line_mode,
 		enum vpdma_channel chan);
 void vpdma_set_frame_start_event(struct vpdma_data *vpdma,
 		enum vpdma_frame_start_event fs_event, enum vpdma_channel chan);
-
+void vpdma_set_bg_color(struct vpdma_data *vpdma,
+			struct vpdma_data_format *fmt, u32 color);
 void vpdma_dump_regs(struct vpdma_data *vpdma);
 
 /* initialize vpdma, passed with VPE's platform device pointer */