Thread (76 messages) 76 messages, 10 authors, 2020-08-13

Re: [PATCH v8 01/14] media: videodev2.h, v4l2-ioctl: add rkisp1 meta buffer format

From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: 2019-08-15 13:30:59
Also in: linux-devicetree, linux-media, linux-rockchip, lkml

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>
quoted hunk ↗ jump to hunk
Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>
Signed-off-by: Jacob Chen <redacted>
Acked-by: Hans Verkuil <redacted>
[update for upstream]
Signed-off-by: Helen Koike <redacted>

---

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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