Hi Markus, Thank you for the patch. On Monday 14 December 2015 15:41:53 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 <mpa@xxxxxxxxxxxxxx> Please see below for a few comments. If you agree about them there's no need to resubmit, I'll fix the patch when applying. > --- > drivers/media/i2c/mt9v032.c | 153 ++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 152 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/i2c/mt9v032.c b/drivers/media/i2c/mt9v032.c > index cc16acf001de..6cbc3b87eda9 100644 > --- a/drivers/media/i2c/mt9v032.c > +++ b/drivers/media/i2c/mt9v032.c [snip] > enum mt9v032_model { > @@ -162,6 +169,8 @@ struct mt9v032_model_data { > unsigned int min_shutter; > unsigned int max_shutter; > unsigned int pclk_reg; > + unsigned int aec_max_shutter_reg; > + const struct v4l2_ctrl_config * const aec_max_shutter_v4l2_ctrl; > }; > > struct mt9v032_model_info { > @@ -175,6 +184,9 @@ static const struct mt9v032_model_version > mt9v032_versions[] = { { MT9V034_CHIP_ID_REV1, "MT9V024/MT9V034 rev1" }, > }; > > +static const struct v4l2_ctrl_config mt9v032_aec_max_shutter_width; > +static const struct v4l2_ctrl_config mt9v034_aec_max_shutter_width; We can avoid forward declarations by moving the mt9v032_model_data array further down in the driver. > static const struct mt9v032_model_data mt9v032_model_data[] = { > { > /* MT9V022, MT9V032 revisions 1/2/3 */ [snip] > @@ 647,6 +663,33 @@ 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. > + */ > +#define V4L2_CID_AEGC_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 - current exp) / 2^LPF) Over 80 columns, you can fix it by just reducing the indentation by one tab. > + */ > +#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) [snip] > @@ -745,6 +810,84 @@ static const struct v4l2_ctrl_config > mt9v032_test_pattern_color = { .flags = 0, > }; > > +static const struct v4l2_ctrl_config mt9v032_aegc_controls[] = { > + { > + .ops = &mt9v032_ctrl_ops, > + .id = V4L2_CID_AEGC_DESIRED_BIN, > + .type = V4L2_CTRL_TYPE_INTEGER, > + .name = "aec_agc_desired_bin", I forgot to reply to your e-mail asking what proper controls names would be, sorry. V4L2 control names contain spaces and use uppercase as needed. This one could be "AEC/AGC Desired Bin" for instance. > + .min = 1, > + .max = 64, > + .step = 1, > + .def = 58, > + .flags = 0, > + }, { > + .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, > + }, { > + .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, > + }, { > + .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, > + }, { > + .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 = MT9V032_TOTAL_SHUTTER_WIDTH_MAX, According the the MT9V032 datasheet I have, the maximum value is 2047 while MT9V032_TOTAL_SHUTTER_WIDTH_MAX is defined as 32767. Do you have any information that would hint for an error in the datasheet ? > + .step = 1, > + .def = MT9V032_TOTAL_SHUTTER_WIDTH_DEF, > + .flags = 0, > +}; > + > +static const struct v4l2_ctrl_config mt9v034_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, > + .step = 1, > + .def = MT9V032_TOTAL_SHUTTER_WIDTH_DEF, > + .flags = 0, > +}; [snip] -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html