On Mon Aug 3 15:58:11 2026 +0900, Yunke Cao wrote:
> Logitech C925e SOF does not increases at a stable rate of 1kHz.
> Add a quirk for this camera to make hwtimestamp usable.
>
> Before applying the quirk:
> ```
> seq: 31 ts: 1075.543294 delta: 29.423 ms fps: 34.94
> seq: 32 ts: 1075.573022 delta: 29.728 ms fps: 34.90
> seq: 33 ts: 1075.602353 delta: 29.331 ms fps: 34.87
> seq: 34 ts: 1075.632031 delta: 29.678 ms fps: 34.84
> seq: 35 ts: 1076.177759 delta: 545.728 ms fps: 23.00
> seq: 36 ts: 1076.213255 delta: 35.496 ms fps: 23.12
> seq: 37 ts: 1076.209371 delta: -3.884 ms fps: 23.82
> seq: 38 ts: 1076.232233 delta: 22.862 ms fps: 24.11
> seq: 39 ts: 1076.264682 delta: 32.449 ms fps: 24.24
> seq: 40 ts: 1076.287318 delta: 22.636 ms fps: 24.52
> seq: 41 ts: 1076.285949 delta: -1.369 ms fps: 25.16
> seq: 42 ts: 1076.317714 delta: 31.765 ms fps: 25.28
> seq: 43 ts: 1076.317085 delta: -0.629 ms fps: 25.89
> seq: 44 ts: 1076.339919 delta: 22.834 ms fps: 26.13
> seq: 45 ts: 1076.212836 delta: -127.083 ms fps: 28.91
> seq: 46 ts: 1076.242494 delta: 29.658 ms fps: 29.00
> seq: 47 ts: 1076.271852 delta: 29.358 ms fps: 29.09
> seq: 48 ts: 1076.301739 delta: 29.887 ms fps: 29.17
> seq: 49 ts: 1076.330887 delta: 29.148 ms fps: 29.26
> seq: 50 ts: 1076.360639 delta: 29.752 ms fps: 29.33
> seq: 51 ts: 1076.390095 delta: 29.456 ms fps: 29.41
> ```
>
> After applying the quirk:
> ```
> seq: 31 ts: 203.782342 delta: 33.460 ms fps: 30.94
> seq: 32 ts: 203.815492 delta: 33.150 ms fps: 30.91
> seq: 33 ts: 203.849017 delta: 33.525 ms fps: 30.88
> seq: 34 ts: 203.882190 delta: 33.173 ms fps: 30.86
> seq: 35 ts: 203.915672 delta: 33.482 ms fps: 30.83
> seq: 36 ts: 203.948902 delta: 33.230 ms fps: 30.81
> seq: 37 ts: 203.982335 delta: 33.433 ms fps: 30.78
> seq: 38 ts: 204.015475 delta: 33.140 ms fps: 30.76
> seq: 39 ts: 204.048992 delta: 33.517 ms fps: 30.74
> seq: 40 ts: 204.082208 delta: 33.216 ms fps: 30.72
> seq: 41 ts: 204.115675 delta: 33.467 ms fps: 30.70
> seq: 42 ts: 204.148995 delta: 33.320 ms fps: 30.69
> seq: 43 ts: 204.182354 delta: 33.359 ms fps: 30.67
> seq: 44 ts: 204.215605 delta: 33.251 ms fps: 30.66
> seq: 45 ts: 204.249004 delta: 33.399 ms fps: 30.64
> seq: 46 ts: 204.282259 delta: 33.255 ms fps: 30.63
> seq: 47 ts: 204.315686 delta: 33.427 ms fps: 30.61
> seq: 48 ts: 204.348945 delta: 33.259 ms fps: 30.60
> seq: 49 ts: 204.382337 delta: 33.392 ms fps: 30.59
> seq: 50 ts: 204.415570 delta: 33.233 ms fps: 30.58
> seq: 51 ts: 204.449069 delta: 33.499 ms fps: 30.56
> seq: 52 ts: 204.482218 delta: 33.149 ms fps: 30.55
> seq: 53 ts: 204.515706 delta: 33.488 ms fps: 30.54
> seq: 54 ts: 204.548940 delta: 33.234 ms fps: 30.53
> seq: 55 ts: 204.582403 delta: 33.463 ms fps: 30.52
> seq: 56 ts: 204.615563 delta: 33.160 ms fps: 30.51
> seq: 57 ts: 204.649057 delta: 33.494 ms fps: 30.50
> seq: 58 ts: 204.682301 delta: 33.244 ms fps: 30.49
> seq: 59 ts: 204.715735 delta: 33.434 ms fps: 30.48
> seq: 60 ts: 204.748890 delta: 33.155 ms fps: 30.48
> ```
>
> lsusb -v
>
> Bus 003 Device 005: ID 046d:085b
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 2.00
> bDeviceClass 239
> bDeviceSubClass 2
> bDeviceProtocol 1
> bMaxPacketSize0 64
> idVendor 0x046d
> idProduct 0x085b
> bcdDevice 0.16
> iManufacturer 0
> iProduct 2 Logitech Webcam C925e
> iSerial 1 2F2036AF
> bNumConfigurations 1
>
> Signed-off-by: Yunke Cao <[email protected]>
> Reviewed-by: Ricardo Ribalda <[email protected]>
> Link: https://patch.msgid.link/[email protected]
> Reviewed-by: Hans de Goede <[email protected]>
> Reviewed-by: Laurent Pinchart <[email protected]>
> Signed-off-by: Hans de Goede <[email protected]>
> Signed-off-by: Laurent Pinchart <[email protected]>
> Signed-off-by: Hans Verkuil <[email protected]>
Patch committed.
Thanks,
Hans Verkuil
drivers/media/usb/uvc/uvc_driver.c | 9 +++++++++
1 file changed, 9 insertions(+)
---
diff --git a/drivers/media/usb/uvc/uvc_driver.c
b/drivers/media/usb/uvc/uvc_driver.c
index 30adde5a8bc9..544cf3ec131a 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2697,6 +2697,15 @@ static const struct usb_device_id uvc_ids[] = {
.bInterfaceProtocol = 0,
.driver_info = UVC_INFO_QUIRK(UVC_QUIRK_RESTORE_CTRLS_ON_INIT
| UVC_QUIRK_INVALID_DEVICE_SOF)
},
+ /* Logitech HD Pro Webcam C925e */
+ { .match_flags = USB_DEVICE_ID_MATCH_DEVICE
+ | USB_DEVICE_ID_MATCH_INT_INFO,
+ .idVendor = 0x046d,
+ .idProduct = 0x085b,
+ .bInterfaceClass = USB_CLASS_VIDEO,
+ .bInterfaceSubClass = 1,
+ .bInterfaceProtocol = 0,
+ .driver_info = UVC_INFO_QUIRK(UVC_QUIRK_INVALID_DEVICE_SOF)
},
/* Logitech HD Pro Webcam C922 */
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE
| USB_DEVICE_ID_MATCH_INT_INFO,
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