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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Helen Koike <helen.koike@collabora.com>
Cc: devicetree@vger.kernel.org, eddie.cai.linux@gmail.com,
	kernel@collabora.com, heiko@sntech.de,
	jacob2.chen@rock-chips.com, jeffy.chen@rock-chips.com,
	zyc@rock-chips.com, linux-kernel@vger.kernel.org,
	tfiga@chromium.org, linux-rockchip@lists.infradead.org,
	hans.verkuil@cisco.com, sakari.ailus@linux.intel.com,
	zhengsq@rock-chips.com, mchehab@kernel.org,
	ezequiel@collabora.com, linux-arm-kernel@lists.infradead.org,
	linux-media@vger.kernel.org
Subject: Re: [PATCH v8 01/14] media: videodev2.h, v4l2-ioctl: add rkisp1 meta buffer format
Date: Thu, 15 Aug 2019 16:30:51 +0300
Message-ID: <20190815133051.GT5011@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20190730184256.30338-2-helen.koike@collabora.com>

Hi Helen,

Thank you for the patch.

On Tue, Jul 30, 2019 at 03:42:43PM -0300, Helen Koike wrote:
> From: Shunqian Zheng <zhengsq@rock-chips.com>
> 
> Add the Rockchip ISP1 specific processing parameter format
> V4L2_META_FMT_RK_ISP1_PARAMS and metadata format
> V4L2_META_FMT_RK_ISP1_STAT_3A for 3A.

I don't like V4L2_META_FMT_RK_ISP1_PARAMS much, as the parameters are
not passed to the hardware through a buffer, but instead written to
registers by the kernel driver. This is an area where V4L2 controls are
traditionally used. I do however understand that it's easier for driver
authors to pass a large set of controls this way when they have to be
applied atomically, but it's clearly a hack in my opinion. I won't
oppose to it though, as I know there's no way we can support this kind
of feature in V4L2 at the moment without an extensive amount of work, so

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>
> Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>
> Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
> [update for upstream]
> Signed-off-by: Helen Koike <helen.koike@collabora.com>
> 
> ---
> 
> Changes in v8: None
> Changes in v7:
> - s/IPU3/RK_ISP1
> 
>  drivers/media/v4l2-core/v4l2-ioctl.c | 2 ++
>  include/uapi/linux/videodev2.h       | 4 ++++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index bb5b4926538a..2df20801a299 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1330,6 +1330,8 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  	case V4L2_META_FMT_VSP1_HGT:	descr = "R-Car VSP1 2-D Histogram"; break;
>  	case V4L2_META_FMT_UVC:		descr = "UVC Payload Header Metadata"; break;
>  	case V4L2_META_FMT_D4XX:	descr = "Intel D4xx UVC Metadata"; break;
> +	case V4L2_META_FMT_RK_ISP1_PARAMS:	descr = "Rockchip ISP1 3A params"; break;
> +	case V4L2_META_FMT_RK_ISP1_STAT_3A:	descr = "Rockchip ISP1 3A statistics"; break;
>  
>  	default:
>  		/* Compressed formats */
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 2427bc4d8eba..ae1e375a10d7 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -756,6 +756,10 @@ struct v4l2_pix_format {
>  #define V4L2_META_FMT_UVC         v4l2_fourcc('U', 'V', 'C', 'H') /* UVC Payload Header metadata */
>  #define V4L2_META_FMT_D4XX        v4l2_fourcc('D', '4', 'X', 'X') /* D4XX Payload Header metadata */
>  
> +/* Vendor specific - used for RK_ISP1 camera sub-system */
> +#define V4L2_META_FMT_RK_ISP1_PARAMS	v4l2_fourcc('R', 'K', '1', 'P') /* Rockchip ISP1 params */
> +#define V4L2_META_FMT_RK_ISP1_STAT_3A	v4l2_fourcc('R', 'K', '1', 'S') /* Rockchip ISP1 3A statistics */
> +
>  /* priv field value to indicates that subsequent fields are valid. */
>  #define V4L2_PIX_FMT_PRIV_MAGIC		0xfeedcafe
>  

-- 
Regards,

Laurent Pinchart

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  reply index

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-30 18:42 [PATCH v8 00/14] Rockchip ISP1 Driver Helen Koike
2019-07-30 18:42 ` [PATCH v8 01/14] media: videodev2.h, v4l2-ioctl: add rkisp1 meta buffer format Helen Koike
2019-08-15 13:30   ` Laurent Pinchart [this message]
2019-07-30 18:42 ` [PATCH v8 02/14] media: doc: add document for " Helen Koike
2019-08-07 13:09   ` Sakari Ailus
2019-08-15 13:51   ` Laurent Pinchart
2019-07-30 18:42 ` [PATCH v8 03/14] media: rkisp1: Add user space ABI definitions Helen Koike
2019-08-15 18:46   ` Laurent Pinchart
2019-07-30 18:42 ` [PATCH v8 04/14] media: rkisp1: add Rockchip MIPI Synopsys DPHY driver Helen Koike
2019-08-07 13:05   ` Sakari Ailus
2019-08-07 13:37     ` Helen Koike
2019-08-15 17:54       ` Laurent Pinchart
2019-08-15 18:26         ` Heiko Stübner
2019-08-21 21:46         ` Helen Koike
2019-08-22  2:32           ` Laurent Pinchart
2019-07-30 18:42 ` [PATCH v8 05/14] media: rkisp1: add Rockchip ISP1 subdev driver Helen Koike
2019-08-06 18:51   ` Helen Koike
2019-08-07 10:39     ` Hans Verkuil
2019-08-15 19:35       ` Laurent Pinchart
2019-08-08  9:14   ` Sakari Ailus
2019-08-15  0:58     ` Helen Koike
2019-08-15  8:24       ` Sakari Ailus
2019-08-15 10:29         ` Tomasz Figa
2019-08-15 10:45           ` Sakari Ailus
2019-08-15 13:17         ` Sakari Ailus
2019-08-16  0:13   ` Laurent Pinchart
2019-07-30 18:42 ` [PATCH v8 06/14] media: rkisp1: add ISP1 statistics driver Helen Koike
2019-08-08  9:37   ` Sakari Ailus
2019-07-30 18:42 ` [PATCH v8 07/14] media: rkisp1: add ISP1 params driver Helen Koike
2019-07-30 18:42 ` [PATCH v8 09/14] media: rkisp1: add rockchip isp1 core driver Helen Koike
2019-08-07 15:27   ` Sakari Ailus
2019-08-08 21:59     ` Helen Koike
2019-08-09 12:05       ` Sakari Ailus
2019-08-07 15:36   ` Sakari Ailus
2019-07-30 18:42 ` [PATCH v8 10/14] dt-bindings: Document the Rockchip ISP1 bindings Helen Koike
2019-08-16  0:21   ` Laurent Pinchart
2019-07-30 18:42 ` [PATCH v8 11/14] dt-bindings: Document the Rockchip MIPI RX D-PHY bindings Helen Koike
2019-08-15 18:14   ` Laurent Pinchart
2019-07-30 18:42 ` [PATCH v8 12/14] arm64: dts: rockchip: add isp0 node for rk3399 Helen Koike
2019-07-30 18:42 ` [PATCH v8 13/14] arm64: dts: rockchip: add rx0 mipi-phy " Helen Koike
2019-07-30 18:42 ` [PATCH v8 14/14] MAINTAINERS: add entry for Rockchip ISP1 driver Helen Koike
2019-08-15 13:56   ` Laurent Pinchart
2019-07-30 20:15 ` [PATCH v8 00/14] Rockchip ISP1 Driver Hans Verkuil
2019-07-30 20:50   ` Helen Koike
2019-07-31  0:08     ` Helen Koike
2019-07-31  4:29       ` Hans Verkuil
2019-07-31  4:33         ` Hans Verkuil
2019-07-31  4:55           ` Hans Verkuil
2019-07-31 14:42             ` Helen Koike
2019-08-07 15:37 ` Sakari Ailus
2019-08-07 17:57   ` Helen Koike
2019-08-09 18:45 ` Manivannan Sadhasivam

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