[PATCH v1 07/15] media: i2c: imx290: Factor out black level setting to a function

Laurent Pinchart
2022-11-22T22:33:21Z

The black level programmed in the BLKLEVEL register depends on the
output format. The black level value computation is currently performed
in imx290_set_ctrl(), in addition to having different black level values
in the output-specific register value tables. Move it to a separate
function to simplify the imx290_set_ctrl() code.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
drivers/media/i2c/imx290.c | 53 +++++++++++++++++++++-----------------
1 file changed, 29 insertions(+), 24 deletions(-)

diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
index 135ed55592a1..d9fc6c44b0f0 100644
--- a/drivers/media/i2c/imx290.c
+++ b/drivers/media/i2c/imx290.c
@@ -152,6 +152,9 @@
#define IMX290_PIXEL_ARRAY_RECORDING_WIDTH 1920
#define IMX290_PIXEL_ARRAY_RECORDING_HEIGHT 1080

+/* Equivalent value for 16bpp */
+#define IMX290_BLACK_LEVEL_DEFAULT 3840
+
#define IMX290_NUM_SUPPLIES 3

struct imx290_regval {
@@ -315,7 +318,6 @@ static const struct imx290_regval imx290_10bit_settings[] = {
{ IMX290_ADBIT2, IMX290_ADBIT2_10BIT },
{ IMX290_ADBIT3, IMX290_ADBIT3_10BIT },
{ IMX290_CSI_DT_FMT, IMX290_CSI_DT_FMT_RAW10 },
- { IMX290_BLKLEVEL, 60 },
};

static const struct imx290_regval imx290_12bit_settings[] = {
@@ -325,7 +327,6 @@ static const struct imx290_regval imx290_12bit_settings[] = {
{ IMX290_ADBIT2, IMX290_ADBIT2_12BIT },
{ IMX290_ADBIT3, IMX290_ADBIT3_12BIT },
{ IMX290_CSI_DT_FMT, IMX290_CSI_DT_FMT_RAW12 },
- { IMX290_BLKLEVEL, 240 },
};

/* supported link frequencies */
@@ -516,35 +517,43 @@ static int imx290_set_data_lanes(struct imx290 *imx290)
return ret;
}

+static int imx290_set_black_level(struct imx290 *imx290,
+ unsigned int black_level, int *err)
+{
+ return imx290_write(imx290, IMX290_BLKLEVEL,
+ black_level >> (16 - imx290->bpp), err);
+}
+
static int imx290_write_current_format(struct imx290 *imx290)
{
+ const struct imx290_regval *regs;
+ unsigned int num_regs;
+ unsigned int bpp;
int ret;

switch (imx290->current_format.code) {
case MEDIA_BUS_FMT_SRGGB10_1X10:
- ret = imx290_set_register_array(imx290, imx290_10bit_settings,
- ARRAY_SIZE(
- imx290_10bit_settings));
- if (ret < 0) {
- dev_err(imx290->dev, "Could not set format registers\n");
- return ret;
- }
+ regs = imx290_10bit_settings;
+ num_regs = ARRAY_SIZE(imx290_10bit_settings);
+ bpp = 10;
break;
case MEDIA_BUS_FMT_SRGGB12_1X12:
- ret = imx290_set_register_array(imx290, imx290_12bit_settings,
- ARRAY_SIZE(
- imx290_12bit_settings));
- if (ret < 0) {
- dev_err(imx290->dev, "Could not set format registers\n");
- return ret;
- }
+ regs = imx290_12bit_settings;
+ num_regs = ARRAY_SIZE(imx290_12bit_settings);
+ bpp = 12;
break;
default:
dev_err(imx290->dev, "Unknown pixel format\n");
return -EINVAL;
}

- return 0;
+ ret = imx290_set_register_array(imx290, regs, num_regs);
+ if (ret < 0) {
+ dev_err(imx290->dev, "Could not set format registers\n");
+ return ret;
+ }
+
+ return imx290_set_black_level(imx290, IMX290_BLACK_LEVEL_DEFAULT, &ret);
}

/* ----------------------------------------------------------------------------
@@ -573,7 +582,7 @@ static int imx290_set_ctrl(struct v4l2_ctrl *ctrl)

case V4L2_CID_TEST_PATTERN:
if (ctrl->val) {
- imx290_write(imx290, IMX290_BLKLEVEL, 0, &ret);
+ imx290_set_black_level(imx290, 0, &ret);
usleep_range(10000, 11000);
imx290_write(imx290, IMX290_PGCTRL,
(u8)(IMX290_PGCTRL_REGEN |
@@ -582,12 +591,8 @@ static int imx290_set_ctrl(struct v4l2_ctrl *ctrl)
} else {
imx290_write(imx290, IMX290_PGCTRL, 0x00, &ret);
usleep_range(10000, 11000);
- if (imx290->bpp == 10)
- imx290_write(imx290, IMX290_BLKLEVEL, 0x3c,
- &ret);
- else /* 12 bits per pixel */
- imx290_write(imx290, IMX290_BLKLEVEL, 0xf0,
- &ret);
+ imx290_set_black_level(imx290, IMX290_BLACK_LEVEL_DEFAULT,
+ &ret);
}
break;