1 files changed, 59 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0486-media-i2c-imx290-Fix-up-exposure-calcuations-and-ran.patch b/target/linux/bcm27xx/patches-5.10/950-0486-media-i2c-imx290-Fix-up-exposure-calcuations-and-ran.patch
new file mode 100644
index 0000000000..9caf98942d
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.10/950-0486-media-i2c-imx290-Fix-up-exposure-calcuations-and-ran.patch
@@ -0,0 +1,59 @@
+From 2b7aa91757952e3214ddfd335ae527b89240ecb8 Mon Sep 17 00:00:00 2001
+From: David Plowman <david.plowman@raspberrypi.com>
+Date: Wed, 17 Feb 2021 18:08:12 +0000
+Subject: [PATCH] media: i2c: imx290: Fix up exposure calcuations and
+ ranges
+
+Should now correspond exactly to the datasheet.
+
+Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
+---
+ drivers/media/i2c/imx290.c | 14 +++++++-------
+ 1 file changed, 7 insertions(+), 7 deletions(-)
+
+--- a/drivers/media/i2c/imx290.c
++++ b/drivers/media/i2c/imx290.c
+@@ -50,7 +50,7 @@ enum imx290_clk_index {
+ #define IMX290_HMAX_MIN_4LANE 2200 /* Min of 2200 pixels = 60fps */
+ #define IMX290_HMAX_MAX 0xffff
+ 
+-#define IMX290_EXPOSURE_MIN 2
++#define IMX290_EXPOSURE_MIN 1
+ #define IMX290_EXPOSURE_STEP 1
+ #define IMX290_EXPOSURE_LOW 0x3020
+ #define IMX290_PGCTRL 0x308c
+@@ -584,7 +584,7 @@ static int imx290_set_gain(struct imx290
+ static int imx290_set_exposure(struct imx290 *imx290, u32 value)
+ {
+ 	u32 exposure = (imx290->current_mode->height + imx290->vblank->val) -
+-						value;
++						value - 1;
+ 	int ret;
+ 
+ 	ret = imx290_write_buffered_reg(imx290, IMX290_EXPOSURE_LOW, 3,
+@@ -855,10 +855,10 @@ static int imx290_set_fmt(struct v4l2_su
+ 		}
+ 		if (imx290->exposure)
+ 			__v4l2_ctrl_modify_range(imx290->exposure,
+-						 mode->vmax - mode->height,
+-						 mode->vmax - 4,
++						 IMX290_EXPOSURE_MIN,
++						 mode->vmax - 2,
+ 						 IMX290_EXPOSURE_STEP,
+-						 mode->vmax - 4);
++						 mode->vmax - 2);
+ 	}
+ 
+ 	*format = fmt->format;
+@@ -1349,9 +1349,9 @@ static int imx290_probe(struct i2c_clien
+ 	imx290->exposure = v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
+ 					     V4L2_CID_EXPOSURE,
+ 					     IMX290_EXPOSURE_MIN,
+-					     mode->vmax - 4,
++					     mode->vmax - 2,
+ 					     IMX290_EXPOSURE_STEP,
+-					     mode->vmax - 4);
++					     mode->vmax - 2);
+ 
+ 	imx290->hflip = v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
+ 					  V4L2_CID_HFLIP, 0, 1, 1, 0);