Re: [PATCH v8 16/23] drm/mediatek: mtk_hdmi: Split driver and add common probe function

["CK Hu (胡俊光)" <ck.hu@mediatek.com>]

On Wed, 2025-04-09 at 15:13 +0200, AngeloGioacchino Del Regno wrote:
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> 
> 
> 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@collabora.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
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c