FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2024-12-31 22:15:38 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

V4L/DVB (8827): gspca: Stop pac7302 autogain oscillation.

Browse Source 
Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans de Goede 2008-09-03 17:12:18 -03:00 committed by Mauro Carvalho Chehab
parent 086272555d
commit 038ec7c772
1 changed files with 29 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
drivers/media/video/gspca/pac7311.c
View File

@ -39,7 +39,7 @@
Address Description
0x02 Clock divider 2-63, fps =~ 60 / val. Must be a multiple of 3 on
the 7302, so one of 3, 6, 9, ...
the 7302, so one of 3, 6, 9, ..., except when between 6 and 12?
-/0x0f Master gain 1-245, low value = high gain
0x10/- Master gain 0-31
-/0x10 Another gain 0-15, limited influence (1-2x gain I guess)
@ -626,8 +626,9 @@ static void setexposure(struct gspca_dev *gspca_dev)
if (sd->sensor == SENSOR_PAC7302) {
/* On the pac7302 reg2 MUST be a multiple of 3, so round it to
the nearest multiple of 3 */
reg = ((reg + 1) / 3) * 3;
the nearest multiple of 3, except when between 6 and 12? */
if (reg < 6 || reg > 12)
reg = ((reg + 1) / 3) * 3;
reg_w(gspca_dev, 0xff, 0x03); /* page 3 */
reg_w(gspca_dev, 0x02, reg);
} else {
@ -761,20 +762,32 @@ static void do_autogain(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
int avg_lum = atomic_read(&sd->avg_lum);
int desired_lum;
int desired_lum, deadzone;
if (avg_lum == -1)
return;
if (sd->sensor == SENSOR_PAC7302)
desired_lum = 70 + sd->brightness * 2;
else
if (sd->sensor == SENSOR_PAC7302) {
desired_lum = 270 + sd->brightness * 4;
/* Hack hack, with the 7202 the first exposure step is
pretty large, so if we're about to make the first
exposure increase make the deadzone large to avoid
oscilating */
if (desired_lum > avg_lum && sd->gain == GAIN_DEF &&
sd->exposure > EXPOSURE_DEF &&
sd->exposure < 42)
deadzone = 90;
else
deadzone = 30;
} else {
desired_lum = 200;
deadzone = 20;
}
if (sd->autogain_ignore_frames > 0)
sd->autogain_ignore_frames--;
else if (gspca_auto_gain_n_exposure(gspca_dev, avg_lum, desired_lum,
10, GAIN_KNEE, EXPOSURE_KNEE))
deadzone, GAIN_KNEE, EXPOSURE_KNEE))
sd->autogain_ignore_frames = PAC_AUTOGAIN_IGNORE_FRAMES;
}
@ -802,7 +815,11 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
int n, lum_offset, footer_length;
if (sd->sensor == SENSOR_PAC7302) {
lum_offset = 34 + sizeof pac_sof_marker;
/* 6 bytes after the FF D9 EOF marker a number of lumination
bytes are send corresponding to different parts of the
image, the 14th and 15th byte after the EOF seem to
correspond to the center of the image */
lum_offset = 61 + sizeof pac_sof_marker;
footer_length = 74;
} else {
lum_offset = 24 + sizeof pac_sof_marker;
@ -829,18 +846,11 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
/* Get average lumination */
if (gspca_dev->last_packet_type == LAST_PACKET &&
n >= lum_offset) {
if (sd->sensor == SENSOR_PAC7302)
atomic_set(&sd->avg_lum,
(data[-lum_offset] << 8) |
n >= lum_offset)
atomic_set(&sd->avg_lum, data[-lum_offset] +
data[-lum_offset + 1]);
else
atomic_set(&sd->avg_lum,
data[-lum_offset] +
data[-lum_offset + 1]);
} else {
else
atomic_set(&sd->avg_lum, -1);
}
/* Start the new frame with the jpeg header */
gspca_frame_add(gspca_dev, FIRST_PACKET, frame,