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[35.228.173.165]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-597d7c1e3b3sm6179856e87.55.2025.12.09.23.53.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Dec 2025 23:53:46 -0800 (PST) From: Ricardo Ribalda Date: Wed, 10 Dec 2025 07:53:43 +0000 Subject: [PATCH] media: dw9714: Fix powerup sequence Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251210-dw9174-timing-v1-1-4a5036465727@chromium.org> X-B4-Tracking: v=1; b=H4sIAAYnOWkC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDI1NDI0MD3ZRyS0NzE92SzNzMvHRdy1RTC0sDY2NLy2RLJaCegqLUtMwKsHn RsbW1AHpAK0lfAAAA X-Change-ID: 20251210-dw9174-timing-9e58903399c9 To: Sakari Ailus , Mauro Carvalho Chehab , Ondrej Jirman , Hans Verkuil Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda X-Mailer: b4 0.14.2 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 Reviewed-by: Hans de Goede Tested-by: Neil Sun --- drivers/media/i2c/dw9714.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/i2c/dw9714.c b/drivers/media/i2c/dw9714.c index 1e7ad355a388cfc37253bd764ec8df98f59beeea..3288de539452ebae41daa0988b2= d52f27a790da7 100644 --- a/drivers/media/i2c/dw9714.c +++ b/drivers/media/i2c/dw9714.c @@ -149,7 +149,7 @@ static int dw9714_power_up(struct dw9714_device *dw9714= _dev) =20 gpiod_set_value_cansleep(dw9714_dev->powerdown_gpio, 0); =20 - usleep_range(1000, 2000); + usleep_range(12000, 14000); =20 return 0; } --- base-commit: f7231cff1f3ff8259bef02dc4999bc132abf29cf change-id: 20251210-dw9174-timing-9e58903399c9 Best regards, --=20 Ricardo Ribalda