2022-04-22 15:00:47 +00:00
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From 0fc6dce34cce94465ae49b11cb2528ef64885d54 Mon Sep 17 00:00:00 2001
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2021-11-24 17:32:01 +00:00
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From: David Plowman <david.plowman@raspberrypi.com>
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Date: Thu, 18 Feb 2021 11:58:29 +0000
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2022-04-22 15:00:47 +00:00
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Subject: [PATCH 351/828] media: i2c: imx290: Handle exposure correctly when
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2021-11-24 17:32:01 +00:00
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vblank changes
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When vblank changes we must modify the exposure range. Also, with this
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sensor, the effective exposure time implicitly changes when vblank
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does, so we have to reset it after every vblank update.
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Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
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---
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drivers/media/i2c/imx290.c | 18 ++++++++++++++++++
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1 file changed, 18 insertions(+)
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--- a/drivers/media/i2c/imx290.c
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+++ b/drivers/media/i2c/imx290.c
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2022-04-22 15:00:47 +00:00
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@@ -618,6 +618,24 @@ static int imx290_set_vmax(struct imx290
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2021-11-24 17:32:01 +00:00
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if (ret)
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dev_err(imx290->dev, "Unable to write vmax\n");
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+ /*
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+ * Changing vblank changes the allowed range for exposure.
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+ * We don't supply the current exposure as default here as it
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+ * may lie outside the new range. We will reset it just below.
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+ */
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+ __v4l2_ctrl_modify_range(imx290->exposure,
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+ IMX290_EXPOSURE_MIN,
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+ vmax - 2,
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+ IMX290_EXPOSURE_STEP,
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+ vmax - 2);
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+
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+ /*
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+ * Becuse of the way exposure works for this sensor, updating
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+ * vblank causes the effective exposure to change, so we must
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+ * set it back to the "new" correct value.
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+ */
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+ imx290_set_exposure(imx290, imx290->exposure->val);
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+
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return ret;
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}
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