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media: dw9714: Fix powerup sequence

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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: 9d00ccabfb ("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>
This commit is contained in:
Ricardo Ribalda
2025-12-10 07:53:43 +00:00
committed by Hans Verkuil
parent 973e42fd5d
commit 401aec35ac
1 changed files with 1 additions and 1 deletions
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2
drivers/media/i2c/dw9714.c
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@@ -149,7 +149,7 @@ static int dw9714_power_up(struct dw9714_device *dw9714_dev)
gpiod_set_value_cansleep(dw9714_dev->powerdown_gpio, 0);
usleep_range(1000, 2000);
usleep_range(12000, 14000);
return 0;
}