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    Subject[PATCH v4 10/14] drm/mediatek: add function to return OVL layer number
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    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>
    Reviewed-by: CK Hu <ck.hu@mediatek.com>
    ---
    drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
    index 0facd823c552..28d191192945 100644
    --- 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,
    --
    2.12.5.2.gbdf23ab
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