linux-kernel - Re: [PATCH v6 35/42] drm/mediatek: mtk_hdmi: Split driver and add common probe function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <d013192eb4eb88716407d0e0f3916fb2591766c4.camel@mediatek.com>
Date: Thu, 13 Feb 2025 08:48:52 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: "robh@...nel.org" <robh@...nel.org>, "jie.qiu@...iatek.com"
	<jie.qiu@...iatek.com>, "tzimmermann@...e.de" <tzimmermann@...e.de>,
	"simona@...ll.ch" <simona@...ll.ch>, "mripard@...nel.org"
	<mripard@...nel.org>, Jitao Shi (石记涛)
	<jitao.shi@...iatek.com>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, "maarten.lankhorst@...ux.intel.com"
	<maarten.lankhorst@...ux.intel.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, "kernel@...labora.com" <kernel@...labora.com>,
	"dmitry.baryshkov@...aro.org" <dmitry.baryshkov@...aro.org>,
	"krzk+dt@...nel.org" <krzk+dt@...nel.org>,
	Lewis Liao (廖柏鈞) <Lewis.Liao@...iatek.com>,
	"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, TommyYL Chen (陳彥良)
	<TommyYL.Chen@...iatek.com>, Ives Chenjh (陳俊弘)
	<Ives.Chenjh@...iatek.com>, "airlied@...il.com" <airlied@...il.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, Jason-JH Lin (林睿祥)
	<Jason-JH.Lin@...iatek.com>, "junzhi.zhao@...iatek.com"
	<junzhi.zhao@...iatek.com>
Subject: Re: [PATCH v6 35/42] drm/mediatek: mtk_hdmi: Split driver and add
 common probe function

On Tue, 2025-02-11 at 12:34 +0100, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> 
> 
> In preparation for adding a new driver for the HDMI TX v2 IP,
> split out the functions that will be common between the already
> present mtk_hdmi (v1) driver and the new one.
> 
> Since the probe flow for both drivers is 90% similar, add a common
> probe function that will be called from each driver's .probe()
> callback, avoiding lots of code duplication.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  drivers/gpu/drm/mediatek/Kconfig           |  11 +-
>  drivers/gpu/drm/mediatek/Makefile          |   1 +
>  drivers/gpu/drm/mediatek/mtk_hdmi.c        | 542 +--------------------
>  drivers/gpu/drm/mediatek/mtk_hdmi_common.c | 426 ++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_hdmi_common.h | 188 +++++++
>  5 files changed, 633 insertions(+), 535 deletions(-)
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_hdmi_common.c
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_hdmi_common.h
> 
> diff --git a/drivers/gpu/drm/mediatek/Kconfig b/drivers/gpu/drm/mediatek/Kconfig
> index e47debd60619..994b48b82d44 100644
> --- a/drivers/gpu/drm/mediatek/Kconfig
> +++ b/drivers/gpu/drm/mediatek/Kconfig
> @@ -30,9 +30,18 @@ config DRM_MEDIATEK_DP
>         help
>           DRM/KMS Display Port driver for MediaTek SoCs.
> 
> +config DRM_MEDIATEK_HDMI_COMMON
> +       tristate
> +       depends on DRM_MEDIATEK
> +       select DRM_DISPLAY_HDMI_HELPER
> +       select DRM_DISPLAY_HELPER
> +       select SND_SOC_HDMI_CODEC if SND_SOC
> +       help
> +         MediaTek SoC HDMI common library
> +
>  config DRM_MEDIATEK_HDMI
>         tristate "DRM HDMI Support for Mediatek SoCs"
>         depends on DRM_MEDIATEK
> -       select SND_SOC_HDMI_CODEC if SND_SOC
> +       select DRM_MEDIATEK_HDMI_COMMON
>         help
>           DRM/KMS HDMI driver for Mediatek SoCs
> diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
> index 43afd0a26d14..78cf2d4fc85f 100644
> --- a/drivers/gpu/drm/mediatek/Makefile
> +++ b/drivers/gpu/drm/mediatek/Makefile
> @@ -21,6 +21,7 @@ mediatek-drm-y := mtk_crtc.o \
> 
>  obj-$(CONFIG_DRM_MEDIATEK) += mediatek-drm.o
> 
> +obj-$(CONFIG_DRM_MEDIATEK_HDMI_COMMON) += mtk_hdmi_common.o

The whole patch looks good to me.
But make common part to a module looks a little bit more modularized.
Let things to be simple, I would like the whole MediaTek hdmi driver be a single module.
For MediaTek drm driver, it is already broken to mediatek-drm, hdmi, dp modules.
Maybe someday dsi or dpi would be broken to modules.
So I would like hdmi to be a single module which include v1, v2 and common part.
If someday we need to optimize code size, then send patch to break hdmi module.

Regards,
CK

>  obj-$(CONFIG_DRM_MEDIATEK_HDMI) += mtk_cec.o
>  obj-$(CONFIG_DRM_MEDIATEK_HDMI) += mtk_hdmi.o
>  obj-$(CONFIG_DRM_MEDIATEK_HDMI) += mtk_hdmi_ddc.o
>