media: hantro: Use core-generated bus_info value

The Hantro driver uses a hardcoded value for the bus_info field in the
media device and |struct v4l2_capability|. This worked well when there
was just one device. However with the iMX.8 series we are now seeing
two Hantro blocks on the same chip. The static bus_info is no longer
sufficient for differentiating devices.

Since commit f2d8b691 ("media: v4l: ioctl: Set bus_info in
v4l_querycap()"), the V4L2 core provides a default value for the
bus_info field for platform and PCI devices. This value will match
the default value for media devices added by commit cef69974
("media: mc: Set bus_info in media_device_init()"). These defaults
are stable and device-specific.

Drop the static bus_info values from the hantro driver and use the
defaults.
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/verisilicon/hantro_drv.c

@@ -1050,8 +1050,6 @@ static int hantro_probe(struct platform_device *pdev)
 
 	vpu->mdev.dev = vpu->dev;
 	strscpy(vpu->mdev.model, DRIVER_NAME, sizeof(vpu->mdev.model));
-	strscpy(vpu->mdev.bus_info, "platform: " DRIVER_NAME,
-		sizeof(vpu->mdev.bus_info));
 	media_device_init(&vpu->mdev);
 	vpu->mdev.ops = &hantro_m2m_media_ops;
 	vpu->v4l2_dev.mdev = &vpu->mdev;

drivers/media/platform/verisilicon/hantro_v4l2.c

@@ -142,8 +142,6 @@ static int vidioc_querycap(struct file *file, void *priv,
 
 	strscpy(cap->driver, vpu->dev->driver->name, sizeof(cap->driver));
 	strscpy(cap->card, vdev->name, sizeof(cap->card));
-	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform: %s",
-		 vpu->dev->driver->name);
 	return 0;
 }