linux-kernel - Re: [PATCH v2 11/15] drm/mediatek: add callback function to return OVL layer number

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Date:   Fri, 3 Aug 2018 13:11:32 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Stu Hsieh <stu.hsieh@...iatek.com>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v2 11/15] drm/mediatek: add callback function to return
 OVL layer number

Hi, Stu:

On Fri, 2018-08-03 at 11:11 +0800, Stu Hsieh wrote:
> This patch add callback function to return OVL layer number
> 
> Signed-off-by: Stu Hsieh <stu.hsieh@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index 978782a77629..a42cfa057f42 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> @@ -58,6 +58,7 @@
>  struct mtk_disp_ovl_data {
>  	unsigned int addr;
>  	bool fmt_rgb565_is_0;
> +	unsigned int layer_nr;
>  };
>  
>  /**
> @@ -132,6 +133,13 @@ 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)
> +{
> +	struct mtk_disp_ovl *ovl = comp_to_ovl(comp);
> +
> +	return ovl->data->layer_nr;

For now, MT8173, MT2712, MT2701 OVL all has 4 layer, so you could return
4 here. Once a SoC OVL has another layer number, then modified the code
to this statement.

Regards,
CK

> +}
> +
>  static void mtk_ovl_layer_on(struct mtk_ddp_comp *comp, unsigned int idx)
>  {
>  	unsigned int reg;
> @@ -221,6 +229,7 @@ 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,
> @@ -319,6 +328,7 @@ static const struct mtk_disp_ovl_data mt2701_ovl_driver_data = {
>  static const struct mtk_disp_ovl_data mt8173_ovl_driver_data = {
>  	.addr = DISP_REG_OVL_ADDR_MT8173,
>  	.fmt_rgb565_is_0 = true,
> +	.layer_nr = 4,
>  };
>  
>  static const struct of_device_id mtk_disp_ovl_driver_dt_match[] = {