[v4,1/2] ipa: libipa: camera_sensor_helper: Add OV5670 black level
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Message ID 20260911153918.96470-2-dmanresa@gmail.com
State New
Headers show
Series
  • ipa: ipu3: Take the OV5670 black level from the sensor helper
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Commit Message

D. Manresa Sept. 11, 2026, 3:39 p.m. UTC 
The OV5670 outputs a data pedestal of 64 at 10 bits. The black level
characterisation in the OEM tuning data for a Dell Latitude 7275 camera
module measures 64.1 to 64.4 at unity gain over six exposure times, and
stays within 62.0 to 64.5 up to a gain of 15.9.

Provide it in the camera sensor helper so that IPAs can use it instead of
hard-coded or tuning-file values.

Signed-off-by: D. Manresa <dmanresa@gmail.com>
---
 src/ipa/libipa/camera_sensor_helper.cpp | 2 ++
 1 file changed, 2 insertions(+)

Patch
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diff --git a/src/ipa/libipa/camera_sensor_helper.cpp b/src/ipa/libipa/camera_sensor_helper.cpp
index 82bf255..eeb3277 100644
--- a/src/ipa/libipa/camera_sensor_helper.cpp
+++ b/src/ipa/libipa/camera_sensor_helper.cpp
@@ -802,6 +802,8 @@  class CameraSensorHelperOv5670 : public CameraSensorHelper
 public:
 	CameraSensorHelperOv5670()
 	{
+		/* Default BLC target of 64 at 10bits, confirmed by measurement. */
+		blackLevel_ = 4096;
 		gain_ = AnalogueGainLinear{ 1, 0, 0, 128 };
 	}
 };