Surface Pro 7+ OV8865 pwr1 test evidence

This file accompanies the RFC patch in 0014-ov8865-pwr1.patch.

Tested hardware and software

• Microsoft Surface Pro 7+
• Intel Tiger Lake IPU6 (8086:9a19)
• Rear sensor: OmniVision OV8865 (INT347A:00)
• Kernel: 6.19.8-surface-3
• libcamera: 0.7.0

Failure before the patch

The INT3472 layer exposed a regulator named INT3472:01-pwr1, but it had
zero users and remained disabled. The OV8865 runtime-resume path failed on
the first I2C software-reset write:

ov8865 i2c-INT347A:00: failed to perform sw reset
ov8865 i2c-INT347A:00: Error -121 runtime-resuming sensor, cannot instantiate VCM

Increasing the power-up delay and retrying the reset five times still
returned -121 on every attempt.

Result after the patch

int3472-discrete INT3472:01:   con_id=pwr1, flags=0x0
ov8865 i2c-INT347A:00: using optional pwr1 regulator
ov8865 i2c-INT347A:00: Instantiated dw9719 VCM

Raw capture:

3264x2448-SBGGR10/RAW
15.00 fps
10/10 frames captured
bytesused: 15980544

Processed capture:

1280x720-ABGR8888/sRGB
30.0 fps
30/30 frames captured
bytesused: 3686400

Front camera

The OV5693 front camera also works on this device after programming
MIPI register 0x4800 to 0x2d before stream-on, as proposed in
linux-surface PR #2171. On this Surface Pro 7+ it captures 1296x972
SBGGR10 at approximately 28.7 fps.