Hi Markus,
Thank you for the patch.
On Friday 06 November 2015 14:13:45 Markus Pargmann wrote:
> This patch adds V4L2 controls for Auto Exposure Control and Auto Gain
> Control settings. These settings include low pass filter, update
> frequency of these settings and the update interval for those units.
>
> Signed-off-by: Markus Pargmann <m...@pengutronix.de>
> ---
> drivers/media/i2c/mt9v032.c | 153 +++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 153 insertions(+)
>
> diff --git a/drivers/media/i2c/mt9v032.c b/drivers/media/i2c/mt9v032.c
> index 943c3f39ea73..978ae8cbb0cc 100644
> --- a/drivers/media/i2c/mt9v032.c
> +++ b/drivers/media/i2c/mt9v032.c
> @@ -133,9 +133,16 @@
> #define MT9V032_TEST_PATTERN_GRAY_DIAGONAL (3 << 11)
> #define MT9V032_TEST_PATTERN_ENABLE (1 << 13)
> #define MT9V032_TEST_PATTERN_FLIP (1 << 14)
> +#define MT9V032_AEC_LPF 0xa8
> +#define MT9V032_AGC_LPF 0xaa
> +#define MT9V032_DESIRED_BIN 0xa5
To better match the datasheet, could you call this MT9V032_AEGC_DESIRED_BIN ?
Same comment for the related control name.
> +#define MT9V032_AEC_UPDATE_INTERVAL 0xa6
> +#define MT9V032_AGC_UPDATE_INTERVAL 0xa9
Simalarly I'd call these two registers MT9V032_AEC_UPDATE_FREQUENCY and
MT9V032_AGC_UPDATE_FREQUENCY as that's how they're named in the datasheet (at
least the version I have). It makes sense to keep using interval in the
control names though, as that's how they operate.
Could you please keep the registers sorted numerically ?
> #define MT9V032_AEC_AGC_ENABLE 0xaf
> #define MT9V032_AEC_ENABLE (1 << 0)
> #define MT9V032_AGC_ENABLE (1 << 1)
> +#define MT9V024_AEC_MAX_SHUTTER_WIDTH 0xad
As other registers specific to the MT9V024 and MT9V034 use the MT9V034 prefix,
could you do so here as well ?
Would it make sense to add the minimum shutter width too ?
> +#define MT9V032_AEC_MAX_SHUTTER_WIDTH 0xbd
> #define MT9V032_THERMAL_INFO 0xc1
>
> enum mt9v032_model {
> @@ -162,6 +169,7 @@ struct mt9v032_model_data {
> unsigned int min_shutter;
> unsigned int max_shutter;
> unsigned int pclk_reg;
> + unsigned int aec_max_shutter_reg;
> };
>
> struct mt9v032_model_info {
> @@ -185,6 +193,7 @@ static const struct mt9v032_model_data
> mt9v032_model_data[] = { .min_shutter = MT9V032_TOTAL_SHUTTER_WIDTH_MIN,
> .max_shutter = MT9V032_TOTAL_SHUTTER_WIDTH_MAX,
> .pclk_reg = MT9V032_PIXEL_CLOCK,
> + .aec_max_shutter_reg = MT9V032_AEC_MAX_SHUTTER_WIDTH,
> }, {
> /* MT9V024, MT9V034 */
> .min_row_time = 690,
> @@ -194,6 +203,7 @@ static const struct mt9v032_model_data
> mt9v032_model_data[] = { .min_shutter = MT9V034_TOTAL_SHUTTER_WIDTH_MIN,
> .max_shutter = MT9V034_TOTAL_SHUTTER_WIDTH_MAX,
> .pclk_reg = MT9V034_PIXEL_CLOCK,
> + .aec_max_shutter_reg = MT9V024_AEC_MAX_SHUTTER_WIDTH,
> },
> };
>
> @@ -265,6 +275,12 @@ struct mt9v032 {
> struct {
> struct v4l2_ctrl *test_pattern;
> struct v4l2_ctrl *test_pattern_color;
> + struct v4l2_ctrl *desired_bin;
> + struct v4l2_ctrl *aec_lpf;
> + struct v4l2_ctrl *agc_lpf;
> + struct v4l2_ctrl *aec_update_interval;
> + struct v4l2_ctrl *agc_update_interval;
> + struct v4l2_ctrl *aec_max_shutter_width;
You don't need to store all those controls in the mt9v032 structure as you
don't use the pointers anywhere. The reason why the test_pattern and
test_pattern_color controls are stored there is that they both affect the same
register and are thus grouped into a control cluster.
> };
> };
>
> @@ -643,6 +659,33 @@ static int mt9v032_set_selection(struct v4l2_subdev
> *subdev, */
>
> #define V4L2_CID_TEST_PATTERN_COLOR (V4L2_CID_USER_BASE | 0x1001)
> +/*
> + * Value between 1 and 64 to set the desired bin. This is effectively a
> measure
> + * of how bright the image is supposed to be. Both AGC and AEC try to reach
> + * this.
> + */
Do you know what the value represents exactly ? Does it have a linear
relationship with the overall image luminance ? Is it related to image binning
at all ?
> +#define V4L2_CID_DESIRED_BIN (V4L2_CID_USER_BASE | 0x1002)
> +/*
> + * LPF is the low pass filter capability of the chip. Both AEC and AGC have
> + * this setting. This limits the speed in which AGC/AEC adjust their
> settings.
> + * Possible values are 0-2. 0 means no LPF. For 1 and 2 this equation is
> used:
> + * if |(Calculated new exp - current exp)| > (current exp / 4)
> + * next exp = Calculated new exp
> + * else
> + * next exp = Current exp +- (Calculated new exp / 2^LPF)
I know this comes directly from the datasheet, but it doesn't make too much
sense to me. I wonder whether the correct formula wouldn't be
next exp = current exp + ((calculated new exp - current exp) / 2^LPF)
> + */
> +#define V4L2_CID_AEC_LPF (V4L2_CID_USER_BASE | 0x1003)
> +#define V4L2_CID_AGC_LPF (V4L2_CID_USER_BASE | 0x1004)
> +/*
> + * Value between 0 and 15. This is the number of frames being skipped
> before
> + * updating the auto exposure/gain.
> + */
> +#define V4L2_CID_AEC_UPDATE_INTERVAL (V4L2_CID_USER_BASE | 0x1005)
> +#define V4L2_CID_AGC_UPDATE_INTERVAL (V4L2_CID_USER_BASE | 0x1006)
> +/*
> + * Maximum shutter width used for AEC.
> + */
> +#define V4L2_CID_AEC_MAX_SHUTTER_WIDTH (V4L2_CID_USER_BASE | 0x1007)
>
> static int mt9v032_s_ctrl(struct v4l2_ctrl *ctrl)
> {
> @@ -712,6 +755,28 @@ static int mt9v032_s_ctrl(struct v4l2_ctrl *ctrl)
> break;
> }
> return regmap_write(map, MT9V032_TEST_PATTERN, data);
> +
> + case V4L2_CID_DESIRED_BIN:
> + return regmap_write(map, MT9V032_DESIRED_BIN, ctrl->val);
> +
> + case V4L2_CID_AEC_LPF:
> + return regmap_write(map, MT9V032_AEC_LPF, ctrl->val);
> +
> + case V4L2_CID_AGC_LPF:
> + return regmap_write(map, MT9V032_AGC_LPF, ctrl->val);
> +
> + case V4L2_CID_AEC_UPDATE_INTERVAL:
> + return regmap_write(map, MT9V032_AEC_UPDATE_INTERVAL,
> + ctrl->val);
> +
> + case V4L2_CID_AGC_UPDATE_INTERVAL:
> + return regmap_write(map, MT9V032_AGC_UPDATE_INTERVAL,
> + ctrl->val);
> +
> + case V4L2_CID_AEC_MAX_SHUTTER_WIDTH:
> + return regmap_write(map,
> + mt9v032->model->data->aec_max_shutter_reg,
> + ctrl->val);
> }
>
> return 0;
> @@ -741,6 +806,78 @@ static const struct v4l2_ctrl_config
> mt9v032_test_pattern_color = { .flags = 0,
> };
>
> +static const struct v4l2_ctrl_config mt9v032_desired_bin = {
> + .ops = &mt9v032_ctrl_ops,
> + .id = V4L2_CID_DESIRED_BIN,
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .name = "aec_agc_desired_bin",
Please use proper controls names.
> + .min = 1,
> + .max = 64,
> + .step = 1,
> + .def = 58,
> + .flags = 0,
> +};
> +
> +static const struct v4l2_ctrl_config mt9v032_aec_lpf = {
> + .ops = &mt9v032_ctrl_ops,
> + .id = V4L2_CID_AEC_LPF,
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .name = "aec_lpf",
> + .min = 0,
> + .max = 2,
> + .step = 1,
> + .def = 0,
> + .flags = 0,
> +};
> +
> +static const struct v4l2_ctrl_config mt9v032_agc_lpf = {
> + .ops = &mt9v032_ctrl_ops,
> + .id = V4L2_CID_AGC_LPF,
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .name = "agc_lpf",
> + .min = 0,
> + .max = 2,
> + .step = 1,
> + .def = 2,
> + .flags = 0,
> +};
> +
> +static const struct v4l2_ctrl_config mt9v032_aec_update_interval = {
> + .ops = &mt9v032_ctrl_ops,
> + .id = V4L2_CID_AEC_UPDATE_INTERVAL,
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .name = "aec_update_interval",
> + .min = 0,
> + .max = 16,
> + .step = 1,
> + .def = 2,
> + .flags = 0,
> +};
> +
> +static const struct v4l2_ctrl_config mt9v032_agc_update_interval = {
> + .ops = &mt9v032_ctrl_ops,
> + .id = V4L2_CID_AGC_UPDATE_INTERVAL,
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .name = "agc_update_interval",
> + .min = 0,
> + .max = 16,
> + .step = 1,
> + .def = 2,
> + .flags = 0,
> +};
> +
> +static const struct v4l2_ctrl_config mt9v032_aec_max_shutter_width = {
> + .ops = &mt9v032_ctrl_ops,
> + .id = V4L2_CID_AEC_MAX_SHUTTER_WIDTH,
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .name = "aec_max_shutter_width",
> + .min = 1,
> + .max = MT9V034_TOTAL_SHUTTER_WIDTH_MAX,
Isn't the maximum value 2047 for the MT9V0[23]2 ?
> + .step = 1,
> + .def = MT9V032_TOTAL_SHUTTER_WIDTH_DEF,
> + .flags = 0,
> +};
> +
> /*
> ---------------------------------------------------------------------------
> -- * V4L2 subdev core operations
> */
> @@ -1010,6 +1147,22 @@ static int mt9v032_probe(struct i2c_client *client,
> mt9v032_test_pattern_menu);
> mt9v032->test_pattern_color = v4l2_ctrl_new_custom(&mt9v032->ctrls,
> &mt9v032_test_pattern_color, NULL);
> + mt9v032->desired_bin = v4l2_ctrl_new_custom(&mt9v032->ctrls,
> + &mt9v032_desired_bin,
> + NULL);
> + mt9v032->aec_lpf = v4l2_ctrl_new_custom(&mt9v032->ctrls,
> + &mt9v032_aec_lpf, NULL);
> + mt9v032->agc_lpf = v4l2_ctrl_new_custom(&mt9v032->ctrls,
> + &mt9v032_agc_lpf, NULL);
> + mt9v032->aec_update_interval = v4l2_ctrl_new_custom(&mt9v032->ctrls,
> + &mt9v032_aec_update_interval,
> + NULL);
> + mt9v032->agc_update_interval = v4l2_ctrl_new_custom(&mt9v032->ctrls,
> + &mt9v032_agc_update_interval,
> + NULL);
> + mt9v032->aec_max_shutter_width = v4l2_ctrl_new_custom(&mt9v032->ctrls,
> + &mt9v032_aec_max_shutter_width,
> + NULL);
As there's no need to store the control pointers I would create an array of
struct v4l2_ctrl_config above instead of defining one variable per control,
and then loop over the array here.
for (i = 0; i < ARRAY_SIZE(mt9v032_aegc_controls); ++i)
v4l2_ctrl_new_custom(&mt9v032->ctrls,
&mt9v032_aegc_controls[i]);
You should also update the above v4l2_ctrl_handler_init() call to take the new
controls into account, as that will improve performances of the control
framework.
v4l2_ctrl_handler_init(&mt9v032->ctrls,
10 + ARRAY_SIZE(mt9v032_aegc_controls));
>
> v4l2_ctrl_cluster(2, &mt9v032->test_pattern);
--
Regards,
Laurent Pinchart
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