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V4L/DVB (10673): mt9t031: fix gain and hflip controls, register updat…
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…e, and scaling

Multiple fixes:
1. allow register update by setting the Output Control register to 2 and not 3
2. fix scaling factor calculations
3. recover lost HFLIP control
4. fix Global Gain calculation

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Guennadi Liakhovetski authored and Mauro Carvalho Chehab committed Mar 30, 2009
1 parent c8329ac commit 70e1d35
Showing 1 changed file with 84 additions and 43 deletions.
127 changes: 84 additions & 43 deletions drivers/media/video/mt9t031.c
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Original file line number Diff line number Diff line change
Expand Up @@ -150,30 +150,30 @@ static int mt9t031_init(struct soc_camera_device *icd)
if (ret >= 0)
ret = reg_write(icd, MT9T031_RESET, 0);
if (ret >= 0)
ret = reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3);
ret = reg_clear(icd, MT9T031_OUTPUT_CONTROL, 2);

return ret >= 0 ? 0 : -EIO;
}

static int mt9t031_release(struct soc_camera_device *icd)
{
/* Disable the chip */
reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3);
reg_clear(icd, MT9T031_OUTPUT_CONTROL, 2);
return 0;
}

static int mt9t031_start_capture(struct soc_camera_device *icd)
{
/* Switch to master "normal" mode */
if (reg_set(icd, MT9T031_OUTPUT_CONTROL, 3) < 0)
if (reg_set(icd, MT9T031_OUTPUT_CONTROL, 2) < 0)
return -EIO;
return 0;
}

static int mt9t031_stop_capture(struct soc_camera_device *icd)
{
/* Stop sensor readout */
if (reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3) < 0)
if (reg_clear(icd, MT9T031_OUTPUT_CONTROL, 2) < 0)
return -EIO;
return 0;
}
Expand Down Expand Up @@ -201,61 +201,89 @@ static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
}

/* Round up minima and round down maxima */
static void recalculate_limits(struct soc_camera_device *icd,
u16 xskip, u16 yskip)
{
icd->x_min = (MT9T031_COLUMN_SKIP + xskip - 1) / xskip;
icd->y_min = (MT9T031_ROW_SKIP + yskip - 1) / yskip;
icd->width_min = (MT9T031_MIN_WIDTH + xskip - 1) / xskip;
icd->height_min = (MT9T031_MIN_HEIGHT + yskip - 1) / yskip;
icd->width_max = MT9T031_MAX_WIDTH / xskip;
icd->height_max = MT9T031_MAX_HEIGHT / yskip;
}

static int mt9t031_set_fmt(struct soc_camera_device *icd,
__u32 pixfmt, struct v4l2_rect *rect)
{
struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
int ret;
const u16 hblank = MT9T031_HORIZONTAL_BLANK,
vblank = MT9T031_VERTICAL_BLANK;
u16 xbin, xskip = mt9t031->xskip, ybin, yskip = mt9t031->yskip,
width = rect->width * xskip, height = rect->height * yskip;
u16 xbin, xskip, ybin, yskip, width, height, left, top;

if (pixfmt) {
/* S_FMT - use binning and skipping for scaling, recalculate */
/*
* try_fmt has put rectangle within limits.
* S_FMT - use binning and skipping for scaling, recalculate
* limits, used for cropping
*/
/* Is this more optimal than just a division? */
for (xskip = 8; xskip > 1; xskip--)
if (rect->width * xskip <= icd->width_max)
if (rect->width * xskip <= MT9T031_MAX_WIDTH)
break;

for (yskip = 8; yskip > 1; yskip--)
if (rect->height * yskip <= icd->height_max)
if (rect->height * yskip <= MT9T031_MAX_HEIGHT)
break;

width = rect->width * xskip;
height = rect->height * yskip;

dev_dbg(&icd->dev, "xskip %u, width %u, yskip %u, height %u\n",
xskip, width, yskip, height);
recalculate_limits(icd, xskip, yskip);
} else {
/* CROP - no change in scaling, or in limits */
xskip = mt9t031->xskip;
yskip = mt9t031->yskip;
}

/* Make sure we don't exceed sensor limits */
if (rect->left + rect->width > icd->width_max)
rect->left = (icd->width_max - rect->width) / 2 + icd->x_min;

if (rect->top + rect->height > icd->height_max)
rect->top = (icd->height_max - rect->height) / 2 + icd->y_min;

width = rect->width * xskip;
height = rect->height * yskip;
left = rect->left * xskip;
top = rect->top * yskip;

xbin = min(xskip, (u16)3);
ybin = min(yskip, (u16)3);

/* Make sure we don't exceed frame limits */
if (rect->left + width > icd->width_max)
rect->left = (icd->width_max - width) / 2;
dev_dbg(&icd->dev, "xskip %u, width %u/%u, yskip %u, height %u/%u\n",
xskip, width, rect->width, yskip, height, rect->height);

if (rect->top + height > icd->height_max)
rect->top = (icd->height_max - height) / 2;

/* Could just do roundup(rect->left, [xy]bin); but this is cheaper */
/* Could just do roundup(rect->left, [xy]bin * 2); but this is cheaper */
switch (xbin) {
case 2:
rect->left = (rect->left + 1) & ~1;
left = (left + 3) & ~3;
break;
case 3:
rect->left = roundup(rect->left, 3);
left = roundup(left, 6);
}

switch (ybin) {
case 2:
rect->top = (rect->top + 1) & ~1;
top = (top + 3) & ~3;
break;
case 3:
rect->top = roundup(rect->top, 3);
top = roundup(top, 6);
}

/* Disable register update, reconfigure atomically */
ret = reg_set(icd, MT9T031_OUTPUT_CONTROL, 1);
if (ret < 0)
return ret;

/* Blanking and start values - default... */
ret = reg_write(icd, MT9T031_HORIZONTAL_BLANKING, hblank);
if (ret >= 0)
Expand All @@ -270,14 +298,14 @@ static int mt9t031_set_fmt(struct soc_camera_device *icd,
ret = reg_write(icd, MT9T031_ROW_ADDRESS_MODE,
((ybin - 1) << 4) | (yskip - 1));
}
dev_dbg(&icd->dev, "new left %u, top %u\n", rect->left, rect->top);
dev_dbg(&icd->dev, "new physical left %u, top %u\n", left, top);

/* The caller provides a supported format, as guaranteed by
* icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap() */
if (ret >= 0)
ret = reg_write(icd, MT9T031_COLUMN_START, rect->left);
ret = reg_write(icd, MT9T031_COLUMN_START, left);
if (ret >= 0)
ret = reg_write(icd, MT9T031_ROW_START, rect->top);
ret = reg_write(icd, MT9T031_ROW_START, top);
if (ret >= 0)
ret = reg_write(icd, MT9T031_WINDOW_WIDTH, width - 1);
if (ret >= 0)
Expand All @@ -302,6 +330,9 @@ static int mt9t031_set_fmt(struct soc_camera_device *icd,
mt9t031->yskip = yskip;
}

/* Re-enable register update, commit all changes */
reg_clear(icd, MT9T031_OUTPUT_CONTROL, 1);

return ret < 0 ? ret : 0;
}

Expand All @@ -310,14 +341,14 @@ static int mt9t031_try_fmt(struct soc_camera_device *icd,
{
struct v4l2_pix_format *pix = &f->fmt.pix;

if (pix->height < icd->height_min)
pix->height = icd->height_min;
if (pix->height > icd->height_max)
pix->height = icd->height_max;
if (pix->width < icd->width_min)
pix->width = icd->width_min;
if (pix->width > icd->width_max)
pix->width = icd->width_max;
if (pix->height < MT9T031_MIN_HEIGHT)
pix->height = MT9T031_MIN_HEIGHT;
if (pix->height > MT9T031_MAX_HEIGHT)
pix->height = MT9T031_MAX_HEIGHT;
if (pix->width < MT9T031_MIN_WIDTH)
pix->width = MT9T031_MIN_WIDTH;
if (pix->width > MT9T031_MAX_WIDTH)
pix->width = MT9T031_MAX_WIDTH;

pix->width &= ~0x01; /* has to be even */
pix->height &= ~0x01; /* has to be even */
Expand Down Expand Up @@ -389,6 +420,14 @@ static const struct v4l2_queryctrl mt9t031_controls[] = {
.maximum = 1,
.step = 1,
.default_value = 0,
}, {
.id = V4L2_CID_HFLIP,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "Flip Horizontally",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 0,
}, {
.id = V4L2_CID_GAIN,
.type = V4L2_CTRL_TYPE_INTEGER,
Expand Down Expand Up @@ -513,21 +552,23 @@ static int mt9t031_set_control(struct soc_camera_device *icd, struct v4l2_contro
if (data < 0)
return -EIO;
} else {
/* Pack it into 1.125..15 variable step, register values 9..67 */
/* Pack it into 1.125..128 variable step, register values 9..0x7860 */
/* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
unsigned long range = qctrl->maximum - qctrl->default_value - 1;
/* calculated gain: map 65..127 to 9..1024 step 0.125 */
unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
111 + range / 2) / range + 9;
1015 + range / 2) / range + 9;

if (gain <= 32)
if (gain <= 32) /* calculated gain 9..32 -> 9..32 */
data = gain;
else if (gain <= 64)
else if (gain <= 64) /* calculated gain 33..64 -> 0x51..0x60 */
data = ((gain - 32) * 16 + 16) / 32 + 80;
else
data = ((gain - 64) * 7 + 28) / 56 + 96;
/* calculated gain 65..1024 -> (1..120) << 8 + 0x60 */
data = (((gain - 64 + 7) * 32) & 0xff00) | 0x60;

dev_dbg(&icd->dev, "Setting gain from %d to %d\n",
reg_read(icd, MT9T031_GLOBAL_GAIN), data);
dev_dbg(&icd->dev, "Setting gain from 0x%x to 0x%x\n",
reg_read(icd, MT9T031_GLOBAL_GAIN), data);
data = reg_write(icd, MT9T031_GLOBAL_GAIN, data);
if (data < 0)
return -EIO;
Expand Down

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