From: Alan McIvor Date: Mon, 2 Apr 2012 00:11:08 +0000 (-0300) Subject: [media] Default bt878 contrast value X-Git-Tag: firefly_0821_release~3680^2~275^2~2465 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=961e668b3447a73c040181def293cfa875c74738;p=firefly-linux-kernel-4.4.55.git [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 Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/bt8xx/bttv-driver.c b/drivers/media/video/bt8xx/bttv-driver.c index e581b37be789..a9cfb0f4be48 100644 --- a/drivers/media/video/bt8xx/bttv-driver.c +++ b/drivers/media/video/bt8xx/bttv-driver.c @@ -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);