Hi Anatolij
On Fri, 28 Sep 2012, Anatolij Gustschin wrote:
> Some camera systems cannot operate mt9v022 in normal mode and use
> only the snapshot mode. The TechNote for mt9v022 (TN0960) and mt9v024
> (TN-09-225) describes required register settings when configuring the
> snapshot operation. The snapshot mode requires that certain automatic
> functions of the image sensor should be disabled or set to fixed values.
>
> According to the TechNote bit 2 and bit 9 in the register 0x20 must be
> set in snapshot mode and unset for normal operation. This applies for
> mt9v022 Rev.3 and mt9v024. Add required reg. 0x20 settings dependent on
> sensor chip version.
>
> Signed-off-by: Anatolij Gustschin <agust@xxxxxxx>
I'm afraid, I don't understand again
> ---
> drivers/media/i2c/soc_camera/mt9v022.c | 31 ++++++++++++++++++++++++++++---
> 1 files changed, 28 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/media/i2c/soc_camera/mt9v022.c b/drivers/media/i2c/soc_camera/mt9v022.c
> index 8feaddc..2abe999 100644
> --- a/drivers/media/i2c/soc_camera/mt9v022.c
> +++ b/drivers/media/i2c/soc_camera/mt9v022.c
> @@ -51,6 +51,7 @@ MODULE_PARM_DESC(sensor_type, "Sensor type: \"colour\" or \"monochrome\"");
> #define MT9V022_PIXEL_OPERATION_MODE 0x0f
> #define MT9V022_LED_OUT_CONTROL 0x1b
> #define MT9V022_ADC_MODE_CONTROL 0x1c
> +#define MT9V022_REG32 0x20
> #define MT9V022_ANALOG_GAIN 0x35
> #define MT9V022_BLACK_LEVEL_CALIB_CTRL 0x47
> #define MT9V022_PIXCLK_FV_LV 0x74
> @@ -79,7 +80,8 @@ MODULE_PARM_DESC(sensor_type, "Sensor type: \"colour\" or \"monochrome\"");
> #define MT9V022_VERTICAL_BLANKING_MAX 3000
> #define MT9V022_VERTICAL_BLANKING_DEF 45
>
> -#define is_mt9v024(id) (id == 0x1324)
> +#define is_mt9v022_rev3(id) (id == 0x1313)
> +#define is_mt9v024(id) (id == 0x1324)
>
> /* MT9V022 has only one fixed colorspace per pixelcode */
> struct mt9v022_datafmt {
> @@ -153,6 +155,7 @@ struct mt9v022 {
> int num_fmts;
> int model; /* V4L2_IDENT_MT9V022* codes from v4l2-chip-ident.h */
> u16 chip_control;
> + u16 chip_version;
> unsigned short y_skip_top; /* Lines to skip at the top */
> };
>
> @@ -235,12 +238,32 @@ static int mt9v022_s_stream(struct v4l2_subdev *sd, int enable)
> struct i2c_client *client = v4l2_get_subdevdata(sd);
> struct mt9v022 *mt9v022 = to_mt9v022(client);
>
> - if (enable)
> + if (enable) {
> /* Switch to master "normal" mode */
> mt9v022->chip_control &= ~0x10;
> - else
> + if (is_mt9v022_rev3(mt9v022->chip_version) ||
> + is_mt9v024(mt9v022->chip_version)) {
> + /*
> + * Unset snapshot mode specific settings: clear bit 9
> + * and bit 2 in reg. 0x20 when in normal mode.
> + */
> + if (reg_clear(client, MT9V022_REG32, 0x204))
> + return -EIO;
> + }
> + } else {
> /* Switch to snapshot mode */
> mt9v022->chip_control |= 0x10;
> + if (is_mt9v022_rev3(mt9v022->chip_version) ||
> + is_mt9v024(mt9v022->chip_version)) {
> + /*
> + * Required settings for snapshot mode: set bit 9
> + * (RST enable) and bit 2 (CR enable) in reg. 0x20
> + * See TechNote TN0960 or TN-09-225.
> + */
> + if (reg_set(client, MT9V022_REG32, 0x204))
> + return -EIO;
> + }
> + }
Do I understand it right, that now on mt9v022 rev.3 and mt9v024 you
unconditionally added using REG32 for leaving the snapshot mode on
streamon and entering it on streamoff. This should be ok in principle,
since that's also what we're trying to do, using the CHIP_CONTROL
register. But in your comment you say, that on some _systems_ you can only
_operate_ in snapshot mode. I.e. the snapshot mode enabled during running
streaming, right? Then how does this patch help you with that?
Thanks
Guennadi
>
> if (reg_write(client, MT9V022_CHIP_CONTROL, mt9v022->chip_control) < 0)
> return -EIO;
> @@ -652,6 +675,8 @@ static int mt9v022_video_probe(struct i2c_client *client)
> goto ei2c;
> }
>
> + mt9v022->chip_version = data;
> +
> mt9v022->reg = is_mt9v024(data) ? &mt9v024_register :
> &mt9v022_register;
>
> --
> 1.7.1
>
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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