V4L/DVB: gspca - zc3xx: Fix the gamma calculation from the contrast
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/gspca/zc3xx.c b/drivers/media/video/gspca/zc3xx.c
index 1bab508..d02aa5c 100644
--- a/drivers/media/video/gspca/zc3xx.c
+++ b/drivers/media/video/gspca/zc3xx.c
@@ -6014,8 +6014,8 @@
int g, i, k, adj, gp;
u8 gr[16];
static const u8 delta_tb[16] = /* delta for contrast */
- {0x15, 0x0d, 0x0a, 0x09, 0x08, 0x08, 0x08, 0x08,
- 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08};
+ {0x2c, 0x1a, 0x12, 0x0c, 0x0a, 0x06, 0x06, 0x06,
+ 0x04, 0x06, 0x04, 0x04, 0x03, 0x03, 0x02, 0x02};
static const u8 gamma_tb[6][16] = {
{0x00, 0x00, 0x03, 0x0d, 0x1b, 0x2e, 0x45, 0x5f,
0x79, 0x93, 0xab, 0xc1, 0xd4, 0xe5, 0xf3, 0xff},
@@ -6037,11 +6037,11 @@
adj = 0;
gp = 0;
for (i = 0; i < 16; i++) {
- g = Tgamma[i] - delta_tb[i] * k / 128 - adj / 2;
+ g = Tgamma[i] - delta_tb[i] * k / 256 - adj / 2;
if (g > 0xff)
g = 0xff;
- else if (g <= 0)
- g = 1;
+ else if (g < 0)
+ g = 0;
reg_w(dev, g, 0x0120 + i); /* gamma */
if (k > 0)
adj--;