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[media] mt9p031: Fix BLC configuration restore when disabling test pattern 

Auto BLC and BLC digital offset are disabled when enabling the test
pattern and must be restored when disabling it. The driver does so by
calling the set control handler on the auto BLC and BLC offset controls,
but this programs the hardware with the new value of those controls, not
the current value. Fix this by writing to the registers directly.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Laurent Pinchart 2014-05-08 10:03:37 -03:00 committed by Mauro Carvalho Chehab
parent 8bf54c4321
commit 535ec214e2
1 changed files with 26 additions and 10 deletions
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36
drivers/media/i2c/mt9p031.c
View File

@ -647,6 +647,28 @@ static int mt9p031_set_crop(struct v4l2_subdev *subdev,
#define V4L2_CID_BLC_ANALOG_OFFSET (V4L2_CID_USER_BASE | 0x1004)
#define V4L2_CID_BLC_DIGITAL_OFFSET (V4L2_CID_USER_BASE | 0x1005)
static int mt9p031_restore_blc(struct mt9p031 *mt9p031)
{
struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
int ret;
if (mt9p031->blc_auto->cur.val != 0) {
ret = mt9p031_set_mode2(mt9p031, 0,
MT9P031_READ_MODE_2_ROW_BLC);
if (ret < 0)
return ret;
}
if (mt9p031->blc_offset->cur.val != 0) {
ret = mt9p031_write(client, MT9P031_ROW_BLACK_TARGET,
mt9p031->blc_offset->cur.val);
if (ret < 0)
return ret;
}
return 0;
}
static int mt9p031_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct mt9p031 *mt9p031 =
@ -722,16 +744,10 @@ static int mt9p031_s_ctrl(struct v4l2_ctrl *ctrl)
if (!ctrl->val) {
/* Restore the BLC settings. */
if (mt9p031->blc_auto->cur.val != 0) {
ret = mt9p031_s_ctrl(mt9p031->blc_auto);
if (ret < 0)
return ret;
}
if (mt9p031->blc_offset->cur.val != 0) {
ret = mt9p031_s_ctrl(mt9p031->blc_offset);
if (ret < 0)
return ret;
}
ret = mt9p031_restore_blc(mt9p031);
if (ret < 0)
return ret;
return mt9p031_write(client, MT9P031_TEST_PATTERN,
MT9P031_TEST_PATTERN_DISABLE);
}