drm/mediatek: add function to return OVL layer number

This patch add function to return OVL layer number

For now, MT8173, MT2712, MT2701 OVL all has 4 layer.

Signed-off-by: Stu Hsieh <stu.hsieh@mediatek.com>
Signed-off-by: CK Hu <ck.hu@mediatek.com>

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 0facd82..28d1911 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -132,6 +132,11 @@ static void mtk_ovl_config(struct mtk_ddp_comp *comp, unsigned int w,
        writel(0x0, comp->regs + DISP_REG_OVL_RST);
 }
 
+static unsigned int mtk_ovl_layer_nr(struct mtk_ddp_comp *comp)
+{
+       return 4;
+}
+
 static void mtk_ovl_layer_on(struct mtk_ddp_comp *comp, unsigned int idx)
 {
        unsigned int reg;
@@ -226,6 +231,7 @@ static const struct mtk_ddp_comp_funcs mtk_disp_ovl_funcs = {
        .stop = mtk_ovl_stop,
        .enable_vblank = mtk_ovl_enable_vblank,
        .disable_vblank = mtk_ovl_disable_vblank,
+       .layer_nr = mtk_ovl_layer_nr,
        .layer_on = mtk_ovl_layer_on,
        .layer_off = mtk_ovl_layer_off,
        .layer_config = mtk_ovl_layer_config,