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| author | Dave Stevenson <dave.stevenson@raspberrypi.com> | 2024-05-01 09:24:27 -0600 |
|---|---|---|
| committer | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2024-06-04 08:31:23 +0200 |
| commit | 8eaf1994a40fdbd9e65c9b9f1e075fb47da6bc89 (patch) | |
| tree | c800fc35e02a123f28f6d8672a2d6f84550cb997 /drivers | |
| parent | c699953f61d42b121d755872048178a0b074efae (diff) | |
| download | linux-8eaf1994a40fdbd9e65c9b9f1e075fb47da6bc89.tar.gz linux-8eaf1994a40fdbd9e65c9b9f1e075fb47da6bc89.tar.bz2 linux-8eaf1994a40fdbd9e65c9b9f1e075fb47da6bc89.zip | |
media: i2c: imx258: Follow normal V4L2 behaviours for clipping exposure
V4L2 sensor drivers are expected to clip the supported exposure
range based on the VBLANK configured.
IMX258 wasn't doing that as register 0x350 (FRM_LENGTH_CTL)
switches it to a mode where frame length tracks coarse exposure time.
Disable this mode and clip the range for V4L2_CID_EXPOSURE appropriately
based on V4L2_CID_VBLANK.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Luis Garcia <git@luigi311.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/i2c/imx258.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c index 8f792f0e0738..ebc404b548b3 100644 --- a/drivers/media/i2c/imx258.c +++ b/drivers/media/i2c/imx258.c @@ -37,10 +37,11 @@ /* Exposure control */ #define IMX258_REG_EXPOSURE 0x0202 +#define IMX258_EXPOSURE_OFFSET 10 #define IMX258_EXPOSURE_MIN 4 #define IMX258_EXPOSURE_STEP 1 #define IMX258_EXPOSURE_DEFAULT 0x640 -#define IMX258_EXPOSURE_MAX 65535 +#define IMX258_EXPOSURE_MAX (IMX258_VTS_MAX - IMX258_EXPOSURE_OFFSET) /* Analog gain control */ #define IMX258_REG_ANALOG_GAIN 0x0204 @@ -371,7 +372,7 @@ static const struct imx258_reg mode_common_regs[] = { { 0x303A, 0x00 }, { 0x303B, 0x10 }, { 0x300D, 0x00 }, - { 0x0350, 0x01 }, + { 0x0350, 0x00 }, { 0x0204, 0x00 }, { 0x0205, 0x00 }, { 0x020E, 0x01 }, @@ -734,6 +735,19 @@ static int imx258_update_digital_gain(struct imx258 *imx258, u32 len, u32 val) return 0; } +static void imx258_adjust_exposure_range(struct imx258 *imx258) +{ + int exposure_max, exposure_def; + + /* Honour the VBLANK limits when setting exposure. */ + exposure_max = imx258->cur_mode->height + imx258->vblank->val - + IMX258_EXPOSURE_OFFSET; + exposure_def = min(exposure_max, imx258->exposure->val); + __v4l2_ctrl_modify_range(imx258->exposure, imx258->exposure->minimum, + exposure_max, imx258->exposure->step, + exposure_def); +} + static int imx258_set_ctrl(struct v4l2_ctrl *ctrl) { struct imx258 *imx258 = @@ -742,6 +756,13 @@ static int imx258_set_ctrl(struct v4l2_ctrl *ctrl) int ret = 0; /* + * The VBLANK control may change the limits of usable exposure, so check + * and adjust if necessary. + */ + if (ctrl->id == V4L2_CID_VBLANK) + imx258_adjust_exposure_range(imx258); + + /* * Applying V4L2 control value only happens * when power is up for streaming */ |