[PATCH RFC 5/6] drm/mediatek: ovl: Disable AFBC on MT8188

[CK Hu (胡俊光)]

On Tue, 2025-12-30 at 11:03 -0300, Nícolas F. R. A. Prado wrote:
> Despite MT8188's OVL being mostly the same IP as the OVL on MT8195, it
> does not support AFBC, even when the same register configurations are
> applied. Introduce a separate compatible for it with AFBC support
> disabled.
> 
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado at collabora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index 196b874057ba..97f6694772d4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> @@ -762,6 +762,21 @@ static const struct mtk_disp_ovl_data mt8192_ovl_2l_driver_data = {
>  	.num_formats = ARRAY_SIZE(mt8173_formats),
>  };
>  
> +static const struct mtk_disp_ovl_data mt8188_ovl_driver_data = {
> +	.addr = DISP_REG_OVL_ADDR_MT8173,
> +	.gmc_bits = 10,
> +	.layer_nr = 4,
> +	.fmt_rgb565_is_0 = true,
> +	.smi_id_en = true,
> +	.supports_afbc = false,

Global variable is initialized to zero, so this could be drop.

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

> +	.blend_modes = BIT(DRM_MODE_BLEND_PREMULTI) |
> +		       BIT(DRM_MODE_BLEND_COVERAGE) |
> +		       BIT(DRM_MODE_BLEND_PIXEL_NONE),
> +	.formats = mt8195_formats,
> +	.num_formats = ARRAY_SIZE(mt8195_formats),
> +	.supports_clrfmt_ext = true,
> +};
> +
>  static const struct mtk_disp_ovl_data mt8195_ovl_driver_data = {
>  	.addr = DISP_REG_OVL_ADDR_MT8173,
>  	.gmc_bits = 10,
> @@ -790,6 +805,8 @@ static const struct of_device_id mtk_disp_ovl_driver_dt_match[] = {
>  	  .data = &mt8192_ovl_driver_data},
>  	{ .compatible = "mediatek,mt8192-disp-ovl-2l",
>  	  .data = &mt8192_ovl_2l_driver_data},
> +	{ .compatible = "mediatek,mt8188-disp-ovl",
> +	  .data = &mt8188_ovl_driver_data},
>  	{ .compatible = "mediatek,mt8195-disp-ovl",
>  	  .data = &mt8195_ovl_driver_data},
>  	{},
>