linux-kernel - [RFC PATCH v3 7/9] media: uapi: Add V4L2_CID_USER_IMX_ASRC_RATIO

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Date:   Thu, 14 Sep 2023 13:54:03 +0800
From:   Shengjiu Wang <shengjiu.wang@....com>
To:     hverkuil@...all.nl, sakari.ailus@....fi, tfiga@...omium.org,
        m.szyprowski@...sung.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        shengjiu.wang@...il.com, Xiubo.Lee@...il.com, festevam@...il.com,
        nicoleotsuka@...il.com, lgirdwood@...il.com, broonie@...nel.org,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v3 7/9] media: uapi: Add V4L2_CID_USER_IMX_ASRC_RATIO_MOD control

The input clock and output clock may not be the accurate
rate as the sample rate, there is some drift, so the convert
ratio of i.MX ASRC module need to be changed according to
actual clock rate.

Add V4L2_CID_USER_IMX_ASRC_RATIO_MOD control for user to
adjust the ratio.

Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
---
 Documentation/userspace-api/media/v4l/control.rst | 5 +++++
 drivers/media/v4l2-core/v4l2-ctrls-defs.c         | 1 +
 include/uapi/linux/v4l2-controls.h                | 1 +
 3 files changed, 7 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/control.rst b/Documentation/userspace-api/media/v4l/control.rst
index 4463fce694b0..2bc175900a34 100644
--- a/Documentation/userspace-api/media/v4l/control.rst
+++ b/Documentation/userspace-api/media/v4l/control.rst
@@ -318,6 +318,11 @@ Control IDs
     depending on particular custom controls should check the driver name
     and version, see :ref:`querycap`.
 
+.. _v4l2-audio-imx:
+
+``V4L2_CID_USER_IMX_ASRC_RATIO_MOD``
+    sets the rasampler ratio modifier of i.MX asrc module.
+
 Applications can enumerate the available controls with the
 :ref:`VIDIOC_QUERYCTRL` and
 :ref:`VIDIOC_QUERYMENU <VIDIOC_QUERYCTRL>` ioctls, get and set a
diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
index 8696eb1cdd61..16f66f66198c 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
@@ -1242,6 +1242,7 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_COLORIMETRY_CLASS:	return "Colorimetry Controls";
 	case V4L2_CID_COLORIMETRY_HDR10_CLL_INFO:		return "HDR10 Content Light Info";
 	case V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY:	return "HDR10 Mastering Display";
+	case V4L2_CID_USER_IMX_ASRC_RATIO_MOD:			return "ASRC RATIO MOD";
 	default:
 		return NULL;
 	}
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index c3604a0a3e30..b1c319906d12 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -162,6 +162,7 @@ enum v4l2_colorfx {
 /* The base for the imx driver controls.
  * We reserve 16 controls for this driver. */
 #define V4L2_CID_USER_IMX_BASE			(V4L2_CID_USER_BASE + 0x10b0)
+#define V4L2_CID_USER_IMX_ASRC_RATIO_MOD	(V4L2_CID_USER_IMX_BASE + 0)
 
 /*
  * The base for the atmel isc driver controls.
-- 
2.34.1