[PATCH] media: uvcvideo: add capture quirks for 1e4e:7102

[Henry Paradiz]

The eEver Live Streaming USB Device HDMI capture card (1e4e:7102,
bcdDevice 1.00) exposes two problems when HDMI is connected but the
input signal does not lock.

While idle, the device disconnects shortly after entering USB runtime
suspend and repeatedly re-enumerates. Keeping it runtime-active stops
this loop. Enable the existing UVC_QUIRK_DISABLE_AUTOSUSPEND for this
USB ID to avoid the repeated USB, UVC and USB-audio discovery messages.
Normal USB disconnect handling is preserved.

On each enumeration, VIDIOC_TRY_FMT takes about 920 ms per call because
uvcvideo negotiates with the device through UVC probe control transfers.
PipeWire queries nine MJPEG frame sizes for colorimetry on its main loop,
blocking unrelated audio mute and volume requests for roughly eight
seconds while audio playback continues on a separate thread.

Add UVC_QUIRK_SKIP_TRY_FMT_PROBE to answer this device's TRY_FMT calls
using the parsed format and frame descriptors. The advertised frame
buffer sizes match the observed probe results for all nine resolutions.
S_FMT continues to negotiate with the hardware, and other devices retain
their existing TRY_FMT behavior.

Both quirks are enabled by one device-specific entry. The card can still
provide diagnostic frames without an HDMI signal; HDMI signal recovery
and capture configuration continue through the normal driver paths.

Signed-off-by: Henry Paradiz <henry.paradiz@xxxxxxxxx>
---
 drivers/media/usb/uvc/uvc_driver.c |  4 ++++
 drivers/media/usb/uvc/uvc_v4l2.c   | 19 ++++++++++++-------
 drivers/media/usb/uvc/uvcvideo.h   |  1 +
 3 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -3055,6 +3055,10 @@
 	  .bInterfaceSubClass	= 1,
 	  .bInterfaceProtocol	= 0,
 	  .driver_info		= (kernel_ulong_t)&uvc_quirk_probe_def },
+	/* eEver Live Streaming USB Device HDMI capture */
+	{ USB_DEVICE_AND_INTERFACE_INFO(0x1e4e, 0x7102, USB_CLASS_VIDEO, 1, 0),
+	  .driver_info = UVC_INFO_QUIRK(UVC_QUIRK_SKIP_TRY_FMT_PROBE
+				      | UVC_QUIRK_DISABLE_AUTOSUSPEND) },
 	/* The Imaging Source USB CCD cameras */
 	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE
 				| USB_DEVICE_ID_MATCH_INT_INFO,
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -241,7 +241,7 @@
 static int uvc_v4l2_try_format(struct uvc_streaming *stream,
 	struct v4l2_format *fmt, struct uvc_streaming_control *probe,
 	const struct uvc_format **uvc_format,
-	const struct uvc_frame **uvc_frame)
+	const struct uvc_frame **uvc_frame, bool probe_device)
 {
 	const struct uvc_format *format = NULL;
 	const struct uvc_frame *frame = NULL;
@@ -336,10 +336,14 @@
 		probe->dwMaxVideoFrameSize =
 			stream->ctrl.dwMaxVideoFrameSize;
 
-	/* Probe the device. */
-	ret = uvc_probe_video(stream, probe);
-	if (ret < 0)
-		return ret;
+	/* Some devices stall on probes during idle format enumeration. */
+	if (probe_device) {
+		ret = uvc_probe_video(stream, probe);
+		if (ret < 0)
+			return ret;
+	} else {
+		probe->dwMaxVideoFrameSize = frame->dwMaxVideoFrameBufferSize;
+	}
 
 	/*
 	 * After the probe, update fmt with the values returned from
@@ -432,7 +436,7 @@
 	if (fmt->type != stream->type)
 		return -EINVAL;
 
-	ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame);
+	ret = uvc_v4l2_try_format(stream, fmt, &probe, &format, &frame, true);
 	if (ret < 0)
 		return ret;
 
@@ -649,7 +653,8 @@
 	struct uvc_streaming *stream = handle->stream;
 	struct uvc_streaming_control probe;
 
-	return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
+	return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL,
+		!(stream->dev->quirks & UVC_QUIRK_SKIP_TRY_FMT_PROBE));
 }
 
 static int uvc_ioctl_enum_input(struct file *file, void *priv,
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -81,6 +81,7 @@
 #define UVC_QUIRK_INVALID_DEVICE_SOF	0x00010000
 #define UVC_QUIRK_MJPEG_NO_EOF		0x00020000
 #define UVC_QUIRK_MSXU_META		0x00040000
+#define UVC_QUIRK_SKIP_TRY_FMT_PROBE	0x00080000
 
 /* Format flags */
 #define UVC_FMT_FLAG_COMPRESSED		0x00000001