linux-kernel - Re: [PATCH v12 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort driver

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Message-ID: <d4b7ec15e66650833e8d5b44510310e7b74773cd.camel@mediatek.com>
Date:   Tue, 28 Jun 2022 13:22:16 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Bo-Chen Chen <rex-bc.chen@...iatek.com>, <chunkuang.hu@...nel.org>,
        <p.zabel@...gutronix.de>, <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <matthias.bgg@...il.com>, <deller@....de>,
        <airlied@...ux.ie>
CC:     <msp@...libre.com>, <granquet@...libre.com>,
        <jitao.shi@...iatek.com>, <wenst@...omium.org>,
        <angelogioacchino.delregno@...labora.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-fbdev@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v12 05/10] drm/mediatek: Add MT8195 Embedded DisplayPort
 driver

Hi, Bo-Chen:

On Mon, 2022-06-27 at 16:03 +0800, Bo-Chen Chen wrote:
> From: Markus Schneider-Pargmann <msp@...libre.com>
> 
> This patch adds a embedded displayport driver for the MediaTek mt8195
> SoC.
> 
> It supports the MT8195, the embedded DisplayPort units. It offers
> DisplayPort 1.4 with up to 4 lanes.
> 
> The driver creates a child device for the phy. The child device will
> never exist without the parent being active. As they are sharing a
> register range, the parent passes a regmap pointer to the child so
> that
> both can work with the same register range. The phy driver sets
> device
> data that is read by the parent to get the phy device that can be
> used
> to control the phy properties.
> 
> This driver is based on an initial version by
> Jitao shi <jitao.shi@...iatek.com>
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> [Bo-Chen: Cleanup the drivers and modify comments from reviewers]
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/Kconfig       |   10 +
>  drivers/gpu/drm/mediatek/Makefile      |    1 +
>  drivers/gpu/drm/mediatek/mtk_dp.c      | 2198
> ++++++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_dp_reg.h  |  543 ++++++
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c |    3 +
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h |    3 +
>  6 files changed, 2758 insertions(+)
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_dp.c
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_dp_reg.h
> 
> diff --git a/drivers/gpu/drm/mediatek/Kconfig
> b/drivers/gpu/drm/mediatek/Kconfig
> index 2976d21e9a34..6d3af73e7e8c 100644
> --- a/drivers/gpu/drm/mediatek/Kconfig
> +++ b/drivers/gpu/drm/mediatek/Kconfig
> @@ -15,12 +15,22 @@ config DRM_MEDIATEK
>  	select MTK_SMI
>  	select PHY_MTK_MIPI_DSI
>  	select VIDEOMODE_HELPERS
> +	select DRM_MEDIATEK_DP

Remove this.

>  	help
>  	  Choose this option if you have a Mediatek SoCs.
>  	  The module will be called mediatek-drm
>  	  This driver provides kernel mode setting and
>  	  buffer management to userspace.
>  
> +config DRM_MEDIATEK_DP
> +	tristate "DRM DPTX Support for MediaTek SoCs"
> +	depends on DRM_MEDIATEK
> +	select PHY_MTK_DP
> +	select DRM_DISPLAY_HELPER
> +	select DRM_DISPLAY_DP_HELPER
> +	help
> +	  DRM/KMS Display Port driver for MediaTek SoCs.
> +
>  

[snip]

> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 78e79c8449c8..8023f1bd5f7e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -1033,6 +1033,9 @@ static struct platform_driver * const
> mtk_drm_drivers[] = {
>  	&mtk_disp_ovl_driver,
>  	&mtk_disp_rdma_driver,
>  	&mtk_dpi_driver,
> +#if IS_REACHABLE(CONFIG_DRM_MEDIATEK_DP)
> +	&mtk_dp_driver,
> +#endif

Remove this, and treat dp driver like hdmi driver.

Regards,
CK

>  	&mtk_drm_platform_driver,
>  	&mtk_dsi_driver,
>  	&mtk_ethdr_driver,
>