linux-kernel - Re: [PATCH v8 17/23] drm/mediatek: Support MT8188 Padding in display driver

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Date:   Tue, 17 Oct 2023 11:44:52 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Hsiao Chien Sung <shawn.sung@...iatek.com>,
        CK Hu <ck.hu@...iatek.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Fei Shao <fshao@...omium.org>,
        Sean Paul <sean@...rly.run>,
        Johnson Wang <johnson.wang@...iatek.corp-partner.google.com>,
        "Nancy . Lin" <nancy.lin@...iatek.com>,
        Moudy Ho <moudy.ho@...iatek.com>,
        "Jason-JH . Lin" <jason-jh.lin@...iatek.com>,
        Nathan Lu <nathan.lu@...iatek.com>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 17/23] drm/mediatek: Support MT8188 Padding in display
 driver

Il 16/10/23 12:40, Hsiao Chien Sung ha scritto:
> Padding is a new display module on MT8188, it provides ability
> to add pixels to width and height of a layer with specified colors.
> 
> Due to hardware design, Mixer in VDOSYS1 requires width of a layer
> to be 2-pixel-align, or 4-pixel-align when ETHDR is enabled,
> we need Padding to deal with odd width.
> 
> Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> ---
>   drivers/gpu/drm/mediatek/Makefile       |   3 +-
>   drivers/gpu/drm/mediatek/mtk_disp_drv.h |   4 +
>   drivers/gpu/drm/mediatek/mtk_drm_drv.c  |   1 +
>   drivers/gpu/drm/mediatek/mtk_drm_drv.h  |   2 +-
>   drivers/gpu/drm/mediatek/mtk_padding.c  | 160 ++++++++++++++++++++++++
>   5 files changed, 168 insertions(+), 2 deletions(-)
>   create mode 100644 drivers/gpu/drm/mediatek/mtk_padding.c
> 
> diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
> index d4d193f60271..5e4436403b8d 100644
> --- a/drivers/gpu/drm/mediatek/Makefile
> +++ b/drivers/gpu/drm/mediatek/Makefile
> @@ -16,7 +16,8 @@ mediatek-drm-y := mtk_disp_aal.o \
>   		  mtk_dsi.o \
>   		  mtk_dpi.o \
>   		  mtk_ethdr.o \
> -		  mtk_mdp_rdma.o
> +		  mtk_mdp_rdma.o \
> +		  mtk_padding.o
>   
>   obj-$(CONFIG_DRM_MEDIATEK) += mediatek-drm.o
>   
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> index bf06ccb65652..e2b602037ac3 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> @@ -159,4 +159,8 @@ void mtk_mdp_rdma_config(struct device *dev, struct mtk_mdp_rdma_cfg *cfg,
>   const u32 *mtk_mdp_rdma_get_formats(struct device *dev);
>   size_t mtk_mdp_rdma_get_num_formats(struct device *dev);
>   
> +int mtk_padding_clk_enable(struct device *dev);
> +void mtk_padding_clk_disable(struct device *dev);
> +void mtk_padding_start(struct device *dev);
> +void mtk_padding_stop(struct device *dev);
>   #endif
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index cdce165c092e..62e6e9785443 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -1025,6 +1025,7 @@ static struct platform_driver * const mtk_drm_drivers[] = {
>   	&mtk_dsi_driver,
>   	&mtk_ethdr_driver,
>   	&mtk_mdp_rdma_driver,
> +	&mtk_padding_driver,
>   };
>   
>   static int __init mtk_drm_init(void)
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> index 8dca68ea1b94..d2efd715699f 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -72,5 +72,5 @@ extern struct platform_driver mtk_dpi_driver;
>   extern struct platform_driver mtk_dsi_driver;
>   extern struct platform_driver mtk_ethdr_driver;
>   extern struct platform_driver mtk_mdp_rdma_driver;
> -
> +extern struct platform_driver mtk_padding_driver;
>   #endif /* MTK_DRM_DRV_H */
> diff --git a/drivers/gpu/drm/mediatek/mtk_padding.c b/drivers/gpu/drm/mediatek/mtk_padding.c
> new file mode 100644
> index 000000000000..fa2e7fc9c7bd
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_padding.c
> @@ -0,0 +1,160 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2023 MediaTek Inc.
> + */
> +

..snip..

> +
> +static const struct of_device_id mtk_padding_driver_dt_match[] = {
> +	{ .compatible = "mediatek,mt8188-padding" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, mtk_padding_driver_dt_match);
> +
> +struct platform_driver mtk_padding_driver = {
> +	.probe		= mtk_padding_probe,
> +	.remove		= mtk_padding_remove,
> +	.driver		= {
> +		.name	= "mediatek-padding",

Please let's be consistent with the driver names, this should be
"mediatek-disp-padding".

After changing that,

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>