From 637f005e455739c8128dadb73dfbe67a4db26f45 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Mon, 2 Dec 2013 16:39:18 -0300 Subject: [PATCH] [media] mt9v032: Fix binning configuration The sensor can scale the image down using binning by 1, 2 or 4 in both directions. Update size enumeration and ratio and binning factor computation accordingly. Signed-off-by: Laurent Pinchart Signed-off-by: Mauro Carvalho Chehab --- drivers/media/i2c/mt9v032.c | 68 ++++++++++++++++++++++++++++++--------------- 1 file changed, 45 insertions(+), 23 deletions(-) diff --git a/drivers/media/i2c/mt9v032.c b/drivers/media/i2c/mt9v032.c index 12360e4..38bf664 100644 --- a/drivers/media/i2c/mt9v032.c +++ b/drivers/media/i2c/mt9v032.c @@ -127,6 +127,8 @@ struct mt9v032 { struct v4l2_mbus_framefmt format; struct v4l2_rect crop; + unsigned int hratio; + unsigned int vratio; struct v4l2_ctrl_handler ctrls; struct { @@ -311,22 +313,20 @@ static int mt9v032_s_stream(struct v4l2_subdev *subdev, int enable) | MT9V032_CHIP_CONTROL_SEQUENTIAL; struct i2c_client *client = v4l2_get_subdevdata(subdev); struct mt9v032 *mt9v032 = to_mt9v032(subdev); - struct v4l2_mbus_framefmt *format = &mt9v032->format; struct v4l2_rect *crop = &mt9v032->crop; - unsigned int hratio; - unsigned int vratio; + unsigned int hbin; + unsigned int vbin; int ret; if (!enable) return mt9v032_set_chip_control(mt9v032, mode, 0); /* Configure the window size and row/column bin */ - hratio = DIV_ROUND_CLOSEST(crop->width, format->width); - vratio = DIV_ROUND_CLOSEST(crop->height, format->height); - + hbin = fls(mt9v032->hratio) - 1; + vbin = fls(mt9v032->vratio) - 1; ret = mt9v032_write(client, MT9V032_READ_MODE, - (hratio - 1) << MT9V032_READ_MODE_ROW_BIN_SHIFT | - (vratio - 1) << MT9V032_READ_MODE_COLUMN_BIN_SHIFT); + hbin << MT9V032_READ_MODE_COLUMN_BIN_SHIFT | + vbin << MT9V032_READ_MODE_ROW_BIN_SHIFT); if (ret < 0) return ret; @@ -369,12 +369,12 @@ static int mt9v032_enum_frame_size(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh, struct v4l2_subdev_frame_size_enum *fse) { - if (fse->index >= 8 || fse->code != V4L2_MBUS_FMT_SGRBG10_1X10) + if (fse->index >= 3 || fse->code != V4L2_MBUS_FMT_SGRBG10_1X10) return -EINVAL; - fse->min_width = MT9V032_WINDOW_WIDTH_DEF / fse->index; + fse->min_width = MT9V032_WINDOW_WIDTH_DEF / (1 << fse->index); fse->max_width = fse->min_width; - fse->min_height = MT9V032_WINDOW_HEIGHT_DEF / fse->index; + fse->min_height = MT9V032_WINDOW_HEIGHT_DEF / (1 << fse->index); fse->max_height = fse->min_height; return 0; @@ -391,18 +391,30 @@ static int mt9v032_get_format(struct v4l2_subdev *subdev, return 0; } -static void mt9v032_configure_pixel_rate(struct mt9v032 *mt9v032, - unsigned int hratio) +static void mt9v032_configure_pixel_rate(struct mt9v032 *mt9v032) { struct i2c_client *client = v4l2_get_subdevdata(&mt9v032->subdev); int ret; ret = v4l2_ctrl_s_ctrl_int64(mt9v032->pixel_rate, - mt9v032->sysclk / hratio); + mt9v032->sysclk / mt9v032->hratio); if (ret < 0) dev_warn(&client->dev, "failed to set pixel rate (%d)\n", ret); } +static unsigned int mt9v032_calc_ratio(unsigned int input, unsigned int output) +{ + /* Compute the power-of-two binning factor closest to the input size to + * output size ratio. Given that the output size is bounded by input/4 + * and input, a generic implementation would be an ineffective luxury. + */ + if (output * 3 > input * 2) + return 1; + if (output * 3 > input) + return 2; + return 4; +} + static int mt9v032_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh, struct v4l2_subdev_format *format) @@ -420,21 +432,25 @@ static int mt9v032_set_format(struct v4l2_subdev *subdev, /* Clamp the width and height to avoid dividing by zero. */ width = clamp_t(unsigned int, ALIGN(format->format.width, 2), - max(__crop->width / 8, MT9V032_WINDOW_WIDTH_MIN), + max(__crop->width / 4, MT9V032_WINDOW_WIDTH_MIN), __crop->width); height = clamp_t(unsigned int, ALIGN(format->format.height, 2), - max(__crop->height / 8, MT9V032_WINDOW_HEIGHT_MIN), + max(__crop->height / 4, MT9V032_WINDOW_HEIGHT_MIN), __crop->height); - hratio = DIV_ROUND_CLOSEST(__crop->width, width); - vratio = DIV_ROUND_CLOSEST(__crop->height, height); + hratio = mt9v032_calc_ratio(__crop->width, width); + vratio = mt9v032_calc_ratio(__crop->height, height); __format = __mt9v032_get_pad_format(mt9v032, fh, format->pad, format->which); __format->width = __crop->width / hratio; __format->height = __crop->height / vratio; - if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) - mt9v032_configure_pixel_rate(mt9v032, hratio); + + if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) { + mt9v032->hratio = hratio; + mt9v032->vratio = vratio; + mt9v032_configure_pixel_rate(mt9v032); + } format->format = *__format; @@ -490,8 +506,11 @@ static int mt9v032_set_crop(struct v4l2_subdev *subdev, crop->which); __format->width = rect.width; __format->height = rect.height; - if (crop->which == V4L2_SUBDEV_FORMAT_ACTIVE) - mt9v032_configure_pixel_rate(mt9v032, 1); + if (crop->which == V4L2_SUBDEV_FORMAT_ACTIVE) { + mt9v032->hratio = 1; + mt9v032->vratio = 1; + mt9v032_configure_pixel_rate(mt9v032); + } } *__crop = rect; @@ -665,7 +684,7 @@ static int mt9v032_registered(struct v4l2_subdev *subdev) dev_info(&client->dev, "MT9V032 detected at address 0x%02x\n", client->addr); - mt9v032_configure_pixel_rate(mt9v032, 1); + mt9v032_configure_pixel_rate(mt9v032); return ret; } @@ -824,6 +843,9 @@ static int mt9v032_probe(struct i2c_client *client, mt9v032->format.field = V4L2_FIELD_NONE; mt9v032->format.colorspace = V4L2_COLORSPACE_SRGB; + mt9v032->hratio = 1; + mt9v032->vratio = 1; + mt9v032->aec_agc = MT9V032_AEC_ENABLE | MT9V032_AGC_ENABLE; mt9v032->hblank = MT9V032_HORIZONTAL_BLANKING_DEF; mt9v032->sysclk = MT9V032_SYSCLK_FREQ_DEF; -- 2.7.4