This patch adds a quirk to force Y8 pixel format even if the camera reports
half-width YUYV.
Signed-off-by: Philipp Zabel <philipp.za...@gmail.com>
---
drivers/media/usb/uvc/uvc_driver.c | 29 ++++++++++++++++++++++++++++-
drivers/media/usb/uvc/uvcvideo.h | 1 +
2 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/drivers/media/usb/uvc/uvc_driver.c
b/drivers/media/usb/uvc/uvc_driver.c
index c3bb250..90a8f10 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -311,6 +311,7 @@ static int uvc_parse_format(struct uvc_device *dev,
struct uvc_format_desc *fmtdesc;
struct uvc_frame *frame;
const unsigned char *start = buffer;
+ bool force_yuy2_to_y8 = false;
unsigned int interval;
unsigned int i, n;
__u8 ftype;
@@ -333,6 +334,22 @@ static int uvc_parse_format(struct uvc_device *dev,
/* Find the format descriptor from its GUID. */
fmtdesc = uvc_format_by_guid(&buffer[5]);
+ format->bpp = buffer[21];
+
+ if (dev->quirks & UVC_QUIRK_FORCE_Y8) {
+ if (fmtdesc && fmtdesc->fcc == V4L2_PIX_FMT_YUYV &&
+ format->bpp == 16) {
+ force_yuy2_to_y8 = true;
+ fmtdesc = &uvc_fmts[9];
+ format->bpp = 8;
+ } else {
+ uvc_printk(KERN_WARNING,
+ "Forcing %d-bit %s to %s not supported",
+ format->bpp, fmtdesc->name,
+ uvc_fmts[9].name);
+ }
+ }
+
if (fmtdesc != NULL) {
strlcpy(format->name, fmtdesc->name,
sizeof format->name);
@@ -345,7 +362,6 @@ static int uvc_parse_format(struct uvc_device *dev,
format->fcc = 0;
}
- format->bpp = buffer[21];
if (buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED) {
ftype = UVC_VS_FRAME_UNCOMPRESSED;
} else {
@@ -455,6 +471,8 @@ static int uvc_parse_format(struct uvc_device *dev,
frame->bFrameIndex = buffer[3];
frame->bmCapabilities = buffer[4];
frame->wWidth = get_unaligned_le16(&buffer[5]);
+ if (force_yuy2_to_y8)
+ frame->wWidth *= 2;
frame->wHeight = get_unaligned_le16(&buffer[7]);
frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
@@ -2467,6 +2485,15 @@ static struct usb_device_id uvc_ids[] = {
.bInterfaceProtocol = 0,
.driver_info = UVC_QUIRK_PROBE_MINMAX
| UVC_QUIRK_IGNORE_SELECTOR_UNIT },
+ /* Oculus VR Positional Tracker DK2 */
+ { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
+ | USB_DEVICE_ID_MATCH_INT_INFO,
+ .idVendor = 0x2833,
+ .idProduct = 0x0201,
+ .bInterfaceClass = USB_CLASS_VIDEO,
+ .bInterfaceSubClass = 1,
+ .bInterfaceProtocol = 0,
+ .driver_info = UVC_QUIRK_FORCE_Y8 },
/* Generic USB Video Class */
{ USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
{}
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 9e35982..1dd78c0 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -137,6 +137,7 @@
#define UVC_QUIRK_FIX_BANDWIDTH 0x00000080
#define UVC_QUIRK_PROBE_DEF 0x00000100
#define UVC_QUIRK_RESTRICT_FRAME_RATE 0x00000200
+#define UVC_QUIRK_FORCE_Y8 0x00000400
/* Format flags */
#define UVC_FMT_FLAG_COMPRESSED 0x00000001
--
2.0.1
--
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