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V4L/DVB (7452): cx88: Enable chroma AGC by default for all non-SECAM modes

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An enabled chroma AGC will not degrade picture quality if enabled on a
color PAL or NTSC signal with nominal signal levels. It will give a
significant color reproduction improvement if the chroma signals
diverge from nominal levels. Therefore enable chroma AGC by default
for PAL and NTSC standards.

Signed-off-by: "Frej Drejhammar <frej.drejhammar@gmail.com>"
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Frej Drejhammar 2008-03-23 22:43:22 -03:00 committed by Mauro Carvalho Chehab
parent 6d04203c7f
commit 87a1738919
2 changed files with 5 additions and 6 deletions
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9
drivers/media/video/cx88/cx88-core.c
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@ -929,11 +929,10 @@ int cx88_set_tvnorm(struct cx88_core *core, v4l2_std_id norm)
dprintk(1,"set_tvnorm: MO_INPUT_FORMAT 0x%08x [old=0x%08x]\n",
cxiformat, cx_read(MO_INPUT_FORMAT) & 0x0f);
/* Chroma AGC must be disabled if SECAM is used */
if (norm & V4L2_STD_SECAM)
cx_andor(MO_INPUT_FORMAT, 0x40f, cxiformat);
else
cx_andor(MO_INPUT_FORMAT, 0xf, cxiformat);
/* Chroma AGC must be disabled if SECAM is used, we enable it
by default on PAL and NTSC */
cx_andor(MO_INPUT_FORMAT, 0x40f,
norm & V4L2_STD_SECAM ? cxiformat : cxiformat | 0x400);
// FIXME: as-is from DScaler
dprintk(1,"set_tvnorm: MO_OUTPUT_FORMAT 0x%08x [old=0x%08x]\n",

2
drivers/media/video/cx88/cx88-video.c
View file

@ -233,7 +233,7 @@ static struct cx88_ctrl cx8800_ctls[] = {
.name = "Chroma AGC",
.minimum = 0,
.maximum = 1,
.default_value = 0x0,
.default_value = 0x1,
.type = V4L2_CTRL_TYPE_BOOLEAN,
},
.reg = MO_INPUT_FORMAT,