Re: [REQUEST FOR GUIDANCE] Dell Panther Lake IR camera (HIMX1092 / Synaptics SVP7500 06CB:0701) — port-2 streaming gated by bridge secure-handshake

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

On Wed, May 13, 2026 at 07:47:41AM -0400, Jake Steinman wrote:
> On Wed, May 13, 2026 at 3:50 AM Laurent Pinchart wrote:
> > On Tue, May 12, 2026 at 09:24:13PM -0400, Jake Steinman wrote:
> > > Hi all,
> > >
> > > Cold mail to a wide CC, sending once instead of many — apologies for the
> > > broadcast. Community Linux camera-enable effort on Dell PB16250 (Panther Lake,
> > > Synaptics SVP7500 bridge USB 06CB:0701). To my knowledge this is the first
> > > working Linux RGB camera on any Panther Lake laptop — OV08X40 streams at
> > > 28.57fps after our IRQF_ONESHOT stability fix in intel_cvs, independently
> > > reproduced on Dell XPS DA16260 + Fedora 44 Silverblue by another community
> > > user. IR (HIMX1092) does not stream, and I think we've narrowed it cleanly to a
> > > bridge-internal secure-auth handshake we can't trigger from outside the Vision
> > > driver stack.
> > >
> > > What works:
> > >
> > > HIMX1092 probes, chip ID 0x1091 confirmed, bound to ipu7-isys CSI-2 port 2, 1 lane
> > > Geometry aligned to Dell production (648×368 SGRBG10, from v81 graph_settings_hm1092 files)
> > > IPU7 firmware ACKs STREAM_START_AND_CAPTURE
> > > intel_ipu7_isys: "stream on CSI2-2 with 1 lanes" (RX listening)
> > > Sensor MODE_SELECT=0x01 ack'd, intel_cvs port-2 mipi config (0x830, verbatim
> > > Windows USBPcap, 5×52-byte chunked) returns 0
> > > Cape FW already at Dell v81 level (1.20.129.0, identical bytes)
> > > What doesn't:
> > >
> > > ZERO sof_event::csi2-2 in any test, including with RGB streaming concurrently at 28.57fps
> > > 10 host-side hypotheses falsified including geometry, format, MIPI replay
> > > verbatim, AE-kicks, vision_sensing flag, dual-stream
> > > Evidence the gate is bridge silicon: usbbridge.sys (Intel Vision driver,
> > > Windows) ships strings RESET_HANDSHAKE_CTX and 1_BRIDGE_STATE_TRIGGER_CTX. Dell
> > > v81 06CB0701.bin (1.97MB, magic VISSOCFW) is identical to what our cape boots.
> > > The handshake exists in cape FW; the trigger isn't a wire opcode visible in
> > > USBPcap, suggesting it crosses MEI/CSE.
> > >
> > > Pinging this group because the answer probably lives at the intersection: Mario
> > > (Dell upstream routing), Hans (camera-stack architecture, prior bridge
> > > enabling), Sakari/Bingbu/Tianshu (IPU7 maintainers), Hans Verkuil (V4L2 second
> > > opinion), Tomas (MEI/CSE if the trigger crosses HECI), Daniel (INT3472 — DSC0
> > > only exposes HANDSHAKE/IR_LED GPIOs, AVDD/DOVDD appear bridge-internal),
> > > Laurent/Kieran (libcamera once unblocked).
> >
> > This seems to be a question for Intel at this point.
> 
> Thanks Laurent — matches our read.
> 
> Sakari and Bingbu (V4L2 + IPU7 maintainers) are already on this thread, but
> my hunch is the answer lives one team over from them — the Vision-stack /
> CSE side that owns the per-sensor bridge auth, not the kernel-V4L2 side.

Note that Bingbu has left Intel. His e-mail address bounces, I've
dropped him from CC. Hans de Goede has also left Red Hat for Qualcomm,
I've updated his e-mail.

Please also note that I only review code written by humans. If you would
like me to be involved in this matter, please make sure to write your
code manually. This also applies to e-mails.

> Anyone from prior IPU3 / IPU6 enabling you've worked with who'd be the
> right contact for that conversation? Even just a "forward this to X" closes
> the loop — happy to take it from there.
> 
> > > Not asking anyone to debug — just a pointer on whether the secure-auth path can
> > > be exposed to a non-Vision-stack driver, or who at Intel/Synaptics owns that
> > > mechanism. Even "talk to <person>" is enormously helpful.
> > >
> > > Background + reproducer:
> > >
> > > - DKMS fix pack (v0.4, MOK-signed, single-command install):
> > https://github.com/
> > > jibsta210/svp7500-camera-fix-pack/releases/tag/v0.4
> > >
> > > - Forensic write-up + IR debug history:
> > https://gist.github.com/jibsta210/
> > > 8316b6a0bc58910891512945c4e91a08
> > >
> > > RELATED:
> > >
> > > https://github.com/intel/ipu7-drivers/issues/26
> > > https://github.com/intel/ipu7-drivers/issues/51
> > > https://github.com/intel/ipu7-drivers/issues/72
> > > https://github.com/intel/vision-drivers/issues/37

-- 
Regards,

Laurent Pinchart