linux-kernel - Re: [PATCH v3 5/6] media: sun4i: Add H3 deinterlace driver

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Date:   Thu, 17 Oct 2019 09:51:28 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Jernej Skrabec <jernej.skrabec@...l.net>, mripard@...nel.org,
        wens@...e.org
Cc:     robh+dt@...nel.org, mark.rutland@....com, mchehab@...nel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v3 5/6] media: sun4i: Add H3 deinterlace driver

On 10/16/19 9:28 PM, Jernej Skrabec wrote:
> Allwinner H3 SoC contains deinterlace unit, which has several modes of
> operation - bypass, weave, bob and mixed (advanced) mode. I don't know
> how mixed mode works, but according to Allwinner it gives best results,
> so they use it exclusively. Currently this mode is also hardcoded here.
> 
> For each interleaved frame queued, this driver produces 2 deinterlaced
> frames. Deinterlaced frames are based on 2 consequtive output buffers,
> except for the first 2, where same output buffer is given to peripheral
> as current and previous.
> 
> There is no documentation for this core, so register layout and fixed
> values were taken from BSP driver.
> 
> I'm not sure if maximum size of the image unit is capable to process is
> governed by size of "flag" buffers, frequency or it really is some HW
> limitation. Currently driver can process full HD image in ~15ms (7.5ms
> for each capture buffer), which allows to process 1920x1080@60i video
> smoothly in real time.
> 
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> ---
>  MAINTAINERS                                   |    7 +
>  drivers/media/platform/sunxi/Kconfig          |    1 +
>  drivers/media/platform/sunxi/Makefile         |    1 +
>  drivers/media/platform/sunxi/sun8i-di/Kconfig |   11 +
>  .../media/platform/sunxi/sun8i-di/Makefile    |    2 +
>  .../media/platform/sunxi/sun8i-di/sun8i-di.c  | 1020 +++++++++++++++++
>  .../media/platform/sunxi/sun8i-di/sun8i-di.h  |  237 ++++
>  7 files changed, 1279 insertions(+)
>  create mode 100644 drivers/media/platform/sunxi/sun8i-di/Kconfig
>  create mode 100644 drivers/media/platform/sunxi/sun8i-di/Makefile
>  create mode 100644 drivers/media/platform/sunxi/sun8i-di/sun8i-di.c
>  create mode 100644 drivers/media/platform/sunxi/sun8i-di/sun8i-di.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c7b48525822a..c375455125fb 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4646,6 +4646,13 @@ M:	"Maciej W. Rozycki" <macro@...ux-mips.org>
>  S:	Maintained
>  F:	drivers/net/fddi/defxx.*
>  
> +DEINTERLACE DRIVERS FOR ALLWINNER H3
> +M:	Jernej Skrabec <jernej.skrabec@...l.net>
> +L:	linux-media@...r.kernel.org
> +T:	git git://linuxtv.org/media_tree.git
> +S:	Maintained
> +F:	drivers/media/platform/sunxi/sun8i-di/
> +
>  DELL SMBIOS DRIVER
>  M:	Pali Rohár <pali.rohar@...il.com>
>  M:	Mario Limonciello <mario.limonciello@...l.com>
> diff --git a/drivers/media/platform/sunxi/Kconfig b/drivers/media/platform/sunxi/Kconfig
> index 71808e93ac2e..d7a5621bf327 100644
> --- a/drivers/media/platform/sunxi/Kconfig
> +++ b/drivers/media/platform/sunxi/Kconfig
> @@ -1,2 +1,3 @@
>  source "drivers/media/platform/sunxi/sun4i-csi/Kconfig"
>  source "drivers/media/platform/sunxi/sun6i-csi/Kconfig"
> +source "drivers/media/platform/sunxi/sun8i-di/Kconfig"

This is a m2m driver, so this belongs in drivers/media/platform/Kconfig in the
Memory-to-memory section.

> diff --git a/drivers/media/platform/sunxi/Makefile b/drivers/media/platform/sunxi/Makefile
> index a05127529006..3878cb4efdc2 100644
> --- a/drivers/media/platform/sunxi/Makefile
> +++ b/drivers/media/platform/sunxi/Makefile
> @@ -1,2 +1,3 @@
>  obj-y		+= sun4i-csi/
>  obj-y		+= sun6i-csi/
> +obj-y		+= sun8i-di/
> diff --git a/drivers/media/platform/sunxi/sun8i-di/Kconfig b/drivers/media/platform/sunxi/sun8i-di/Kconfig
> new file mode 100644
> index 000000000000..dbd77a61e3b3
> --- /dev/null
> +++ b/drivers/media/platform/sunxi/sun8i-di/Kconfig
> @@ -0,0 +1,11 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +config VIDEO_SUN8I_DEINTERLACE
> +	tristate "Allwinner Deinterlace driver"
> +	depends on VIDEO_DEV && VIDEO_V4L2
> +	depends on HAS_DMA
> +	depends on OF
> +	depends on PM
> +	select VIDEOBUF2_DMA_CONTIG
> +	select V4L2_MEM2MEM_DEV
> +	help
> +	   Support for the Allwinner Deinterlace unit found on some SoCs.

Shouldn't this depend on ARCH_SUNXI || COMPILE_TEST?
And also on COMMON_CLK?

Regards,

	Hans