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53 lines
2.2 KiB
Diff
53 lines
2.2 KiB
Diff
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From cf16974cd2daa3ae3fa3faf7c12c8b2d44828950 Mon Sep 17 00:00:00 2001
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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Date: Sun, 16 Oct 2022 09:15:16 +0300
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Subject: [PATCH] media: i2c: imx290: Fix max gain value
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Upstream commit 6d7a87f2d3a6.
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The gain is expressed in multiple of 0.3dB, as a value between 0.0dB
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and 72.0dB. Gains between 0.0dB and 30.0dB (included) apply analog gain
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only, higher gains from 30.3dB to 72dB apply additional digital gain.
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The maximum gain value is erroneously set to 72. Increase it to 100 to
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cover the whole analog gain range. Support for digital gain can be added
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separately if needed.
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The IMX327 and IMX462 are largely compatible with the IMX290, but have
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an analog gain range of 0.0dB to 29.4dB and 42dB of digital gain. When
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support for those sensors gets added to the driver, the gain control
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should be adjusted accordingly.
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Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Reviewed-by: Alexander Stein <alexander.stein@ew.tq-group.com>
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Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
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---
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drivers/media/i2c/imx290.c | 15 ++++++++++++++-
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1 file changed, 14 insertions(+), 1 deletion(-)
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--- a/drivers/media/i2c/imx290.c
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+++ b/drivers/media/i2c/imx290.c
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@@ -1019,8 +1019,21 @@ static int imx290_probe(struct i2c_clien
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v4l2_ctrl_handler_init(&imx290->ctrls, 5);
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imx290->ctrls.lock = &imx290->lock;
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+ /*
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+ * The sensor has an analog gain and a digital gain, both controlled
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+ * through a single gain value, expressed in 0.3dB increments. Values
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+ * from 0.0dB (0) to 30.0dB (100) apply analog gain only, higher values
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+ * up to 72.0dB (240) add further digital gain. Limit the range to
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+ * analog gain only, support for digital gain can be added separately
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+ * if needed.
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+ *
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+ * The IMX327 and IMX462 are largely compatible with the IMX290, but
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+ * have an analog gain range of 0.0dB to 29.4dB and 42dB of digital
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+ * gain. When support for those sensors gets added to the driver, the
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+ * gain control should be adjusted accordingly.
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+ */
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v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
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- V4L2_CID_GAIN, 0, 72, 1, 0);
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+ V4L2_CID_GAIN, 0, 100, 1, 0);
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v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
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V4L2_CID_EXPOSURE, 1, IMX290_VMAX_DEFAULT - 2, 1,
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