[PATCH 2/2] drm/mediatek: clear IRQ status before enable OVL interrupt

[CK Hu]

Acked-by: CK Hu <ck.hu at mediatek.com>

On Thu, 2016-09-29 at 11:29 +0800, Bibby Hsieh wrote:
> To make sure that the first vblank IRQ after enabling
> vblank isn't too short or immediate, we have to clear
> the IRQ status before enable OVL interrupt.
> 
> Signed-off-by: Bibby Hsieh <bibby.hsieh at mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_ovl.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index 019b7ca..f75c5b5 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> @@ -80,6 +80,7 @@ static void mtk_ovl_enable_vblank(struct mtk_ddp_comp *comp,
>  						 ddp_comp);
>  
>  	priv->crtc = crtc;
> +	writel(0x0, comp->regs + DISP_REG_OVL_INTSTA);
>  	writel_relaxed(OVL_FME_CPL_INT, comp->regs + DISP_REG_OVL_INTEN);
>  }
>