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[media] Default bt878 contrast value 

The default_value for the Bt878 V4L2_CID_CONTRAST control is currently
set to 32768. Internally this gets translated to an analog input
circuit gain of 1.19. However, the default gain should be 1.0. This
patch alters the default value to 27648 which corresponds to a gain of
1.0. It also alters the probe routine so that the correct value is
written on board initialisation.

[mchehab@redhat.com: behavior confirmed via Fusion 878a datasheet]
Signed-off-by: Alan McIvor <alan.mcivor@reveal.co.nz>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Alan McIvor 2012-04-01 21:11:08 -03:00 committed by Mauro Carvalho Chehab
parent 9d454d48eb
commit 961e668b34
1 changed files with 2 additions and 2 deletions
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4
drivers/media/video/bt8xx/bttv-driver.c
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@ -663,7 +663,7 @@ static const struct v4l2_queryctrl bttv_ctls[] = {
.minimum = 0,
.maximum = 65535,
.step = 128,
.default_value = 32768,
.default_value = 27648,
.type = V4L2_CTRL_TYPE_INTEGER,
},{
.id = V4L2_CID_SATURATION,
@ -4394,7 +4394,7 @@ static int __devinit bttv_probe(struct pci_dev *dev,
if (!bttv_tvcards[btv->c.type].no_video) {
bttv_register_video(btv);
bt848_bright(btv,32768);
bt848_contrast(btv,32768);
bt848_contrast(btv, 27648);
bt848_hue(btv,32768);
bt848_sat(btv,32768);
audio_mute(btv, 1);