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| author | Ricardo Ribalda <ribalda@chromium.org> | 2025-12-10 07:53:43 +0000 |
|---|---|---|
| committer | Hans Verkuil <hverkuil+cisco@kernel.org> | 2026-01-15 11:32:14 +0100 |
| commit | 401aec35ac7bd04b4018a519257b945abb88e26c (patch) | |
| tree | d0a3d98ca6f02dfe4d689a1898a512b931debca6 /tools/lib/python/kdoc | |
| parent | 973e42fd5d2b397bff34f0c249014902dbf65912 (diff) | |
| download | linux-401aec35ac7bd04b4018a519257b945abb88e26c.tar.gz linux-401aec35ac7bd04b4018a519257b945abb88e26c.zip | |
media: dw9714: Fix powerup sequence
We have experienced seen multiple I2C errors while doing stress test on
the module:
dw9714 i2c-PRP0001:01: dw9714_vcm_resume I2C failure: -5
dw9714 i2c-PRP0001:01: I2C write fail
Inspecting the powerup sequence we found that it does not match the
documentation at:
https://blog.arducam.com/downloads/DW9714A-DONGWOON(Autofocus_motor_manual).pdf
"""
(2) DW9714A requires waiting time of 12ms after power on. During this
waiting time, the offset calibration of internal amplifier is
operating for minimization of output offset current .
"""
This patch increases the powerup delay to follow the documentation.
Fixes: 9d00ccabfbb5 ("media: i2c: dw9714: Fix occasional probe errors")
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Tested-by: Neil Sun <neil.sun@lcfuturecenter.com>
Reported-by: Naomi Huang <naomi.huang@lcfuturecenter.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Diffstat (limited to 'tools/lib/python/kdoc')
0 files changed, 0 insertions, 0 deletions