linux-kernel - [PATCH 2/2] media: atomisp: register first the preview devnode

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Date:   Sat,  6 Nov 2021 12:05:37 +0000
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Aline Santana Cordeiro <alinesantanacordeiro@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Matthias Maennich <maennich@...gle.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev
Subject: [PATCH 2/2] media: atomisp: register first the preview devnode

The atomisp currenyl registers 5 pairs of devices each one
for one different run_mode, plus one for "ACC". The only
one that behaves like a normal V4L2 device is the preview
one. The others are doing weird things, and perhaps are
using some proprietary extensions to the API.

Change the device order to start with the preview one,
e. g:

	/dev/video0: ATOMISP ISP PREVIEW output
	/dev/video1: ATOMISP ISP CAPTURE output
	/dev/video2: ATOMISP ISP VIEWFINDER output
	/dev/video3: ATOMISP ISP VIDEO output
	/dev/video4: ATOMISP ACC

This way, a normal V4L2 application will get the right
device, as the first one will be the one they should use.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---

To mailbombing on a large number of people, only mailing lists were C/C on the cover.
See [PATCH 0/2] at: https://lore.kernel.org/all/cover.1636200095.git.mchehab+huawei@kernel.org/

 .../staging/media/atomisp/pci/atomisp_subdev.c   | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_subdev.c b/drivers/staging/media/atomisp/pci/atomisp_subdev.c
index ffaf11e0b0ad..a3f3c42f9db7 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_subdev.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_subdev.c
@@ -1356,6 +1356,14 @@ int atomisp_subdev_register_entities(struct atomisp_sub_device *asd,
 	if (ret < 0)
 		goto error;
 
+	asd->video_out_preview.vdev.v4l2_dev = vdev;
+	asd->video_out_preview.vdev.device_caps = device_caps |
+						  V4L2_CAP_VIDEO_OUTPUT;
+	ret = video_register_device(&asd->video_out_preview.vdev,
+				    VFL_TYPE_VIDEO, -1);
+	if (ret < 0)
+		goto error;
+
 	asd->video_out_capture.vdev.v4l2_dev = vdev;
 	asd->video_out_capture.vdev.device_caps = device_caps |
 						  V4L2_CAP_VIDEO_OUTPUT;
@@ -1371,13 +1379,7 @@ int atomisp_subdev_register_entities(struct atomisp_sub_device *asd,
 				    VFL_TYPE_VIDEO, -1);
 	if (ret < 0)
 		goto error;
-	asd->video_out_preview.vdev.v4l2_dev = vdev;
-	asd->video_out_preview.vdev.device_caps = device_caps |
-						  V4L2_CAP_VIDEO_OUTPUT;
-	ret = video_register_device(&asd->video_out_preview.vdev,
-				    VFL_TYPE_VIDEO, -1);
-	if (ret < 0)
-		goto error;
+
 	asd->video_out_video_capture.vdev.v4l2_dev = vdev;
 	asd->video_out_video_capture.vdev.device_caps = device_caps |
 							V4L2_CAP_VIDEO_OUTPUT;
-- 
2.33.1