Previously, possible digital gains were just 1x, 2x and 4x. These
coarse gains were not sufficient in fine-tuning the image capture.
Now, digital gain range is [0, 16x] with each step 1/1024, default 1x.
This is achieved through OV13858 MWB R/G/B gain controls.
Signed-off-by: Chiranjeevi Rapolu <chiranjeevi.rapolu@xxxxxxxxx>
---
drivers/media/i2c/ov13858.c | 32 ++++++++++++++++----------------
1 file changed, 16 insertions(+), 16 deletions(-)
diff --git a/drivers/media/i2c/ov13858.c b/drivers/media/i2c/ov13858.c
index 86550d8..b78e323b 100644
--- a/drivers/media/i2c/ov13858.c
+++ b/drivers/media/i2c/ov13858.c
@@ -78,13 +78,13 @@
#define OV13858_ANA_GAIN_DEFAULT 0x80
/* Digital gain control */
-#define OV13858_REG_DIGITAL_GAIN 0x350a
-#define OV13858_DGTL_GAIN_MASK 0xf3
-#define OV13858_DGTL_GAIN_SHIFT 2
-#define OV13858_DGTL_GAIN_MIN 1
-#define OV13858_DGTL_GAIN_MAX 4
-#define OV13858_DGTL_GAIN_STEP 1
-#define OV13858_DGTL_GAIN_DEFAULT 1
+#define OV13858_REG_B_MWB_GAIN 0x5100
+#define OV13858_REG_G_MWB_GAIN 0x5102
+#define OV13858_REG_R_MWB_GAIN 0x5104
+#define OV13858_DGTL_GAIN_MIN 0
+#define OV13858_DGTL_GAIN_MAX 16384 /* Max = 16 X */
+#define OV13858_DGTL_GAIN_DEFAULT 1024 /* Default gain = 1 X */
+#define OV13858_DGTL_GAIN_STEP 1 /* Each step = 1/1024 */
/* Test Pattern Control */
#define OV13858_REG_TEST_PATTERN 0x4503
@@ -1161,21 +1161,21 @@ static int ov13858_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
static int ov13858_update_digital_gain(struct ov13858 *ov13858, u32 d_gain)
{
int ret;
- u32 val;
- if (d_gain == 3)
- return -EINVAL;
+ ret = ov13858_write_reg(ov13858, OV13858_REG_B_MWB_GAIN,
+ OV13858_REG_VALUE_16BIT, d_gain);
+ if (ret)
+ return ret;
- ret = ov13858_read_reg(ov13858, OV13858_REG_DIGITAL_GAIN,
- OV13858_REG_VALUE_08BIT, &val);
+ ret = ov13858_write_reg(ov13858, OV13858_REG_G_MWB_GAIN,
+ OV13858_REG_VALUE_16BIT, d_gain);
if (ret)
return ret;
- val &= OV13858_DGTL_GAIN_MASK;
- val |= (d_gain - 1) << OV13858_DGTL_GAIN_SHIFT;
+ ret = ov13858_write_reg(ov13858, OV13858_REG_R_MWB_GAIN,
+ OV13858_REG_VALUE_16BIT, d_gain);
- return ov13858_write_reg(ov13858, OV13858_REG_DIGITAL_GAIN,
- OV13858_REG_VALUE_08BIT, val);
+ return ret;
}
static int ov13858_enable_test_pattern(struct ov13858 *ov13858, u32 pattern)
--
1.9.1
