Jean-Francois Moine wrote:
>> Skippy le Grand Gourou wrote[1]:
>>> Hercules Deluxe USB webcam won't work, see the end of the kernel
>>> log.
>> [...]
>>> [521041.808976] gspca: probing 05a9:4519
>>> [521042.469094] ov519: I2C synced in 3 attempt(s)
>>> [521042.469097] ov519: starting OV7xx0 configuration
>>> [521042.469793] ov519: Unknown image sensor version: 2
>>> [521042.469795] ov519: Failed to configure OV7xx0
[...]
>>> [528513.526783] gspca: main v2.7.0 registered
>>> [528513.527299] gspca: probing 05a9:4519
>>> [528514.190995] ov519: I2C synced in 3 attempt(s)
>>> [528514.190998] ov519: starting OV7xx0 configuration
>>> [528514.192570] ov519: Sensor is an OV7610
[...]
> The git commit b877a9a7fb0 (gspca - ov519: Fix sensor detection
> problems) may have fix this problem.
Oh! Yep, the symptoms match well --- sorry I missed it.
> To be sure, try the gspca test version from my web site.
Skippy, assuming that works (and I expect it would), could you try the
attached patch against 2.6.32.y? It works like this:
0. Prerequisites:
apt-get install git build-essential
1. Get the kernel, if you don't already have it:
git clone \
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
2. Fetch point releases:
cd linux
git remote add -f stable \
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
3. Try the 2.6.32.y branch:
git checkout stable/linux-2.6.32.y
cp /boot/config-$(uname -r) .config; # current configuration
make localmodconfig; # optional: minimize configuration
make; # optionally with -j<num> for parallel build
fakeroot -u make deb-pkg
dpkg -i ../<name of package>
reboot
"make localmodconfig" works by leaving out drivers whose modules are
not currently loaded, so take care to make sure the gspca and ov519
modules are built. ("make nconfig" customizes the configuration.)
Hopefully this kernel reproduces the bug.
4. See if the patch helps:
git am -3sc <path to patch>
make; # maybe with -j4
fakeroot -u make deb-pkg
dpkg -i ../<name of package>
reboot
Hopeful,
Jonathan
From: Jean-François Moine <moinejf@xxxxxxx>
Date: Sun, 3 Jul 2011 05:17:27 -0300
Subject: [media] gspca - ov519: Fix sensor detection problems
commit b877a9a7fb00d96bae4ab49c69f1be65b3e87e61 upstream.
The sensor of some webcams could not be detected due to timing problems
in sensor register reading. This patch adds bridge register readings
before sensor register reading.
Signed-off-by: Jean-François Moine <moinejf@xxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
---
drivers/media/video/gspca/ov519.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/media/video/gspca/ov519.c b/drivers/media/video/gspca/ov519.c
index e16557819782..7a31e432d038 100644
--- a/drivers/media/video/gspca/ov519.c
+++ b/drivers/media/video/gspca/ov519.c
@@ -1314,11 +1314,14 @@ static int ov518_i2c_r(struct sd *sd, __u8 reg)
rc = reg_w(sd, R518_I2C_CTL, 0x03);
if (rc < 0)
return rc;
+ reg_r8(sd, R518_I2C_CTL);
/* Initiate 2-byte read cycle */
rc = reg_w(sd, R518_I2C_CTL, 0x05);
if (rc < 0)
return rc;
+ reg_r8(sd, R518_I2C_CTL);
+
value = reg_r(sd, R51x_I2C_DATA);
PDEBUG(D_USBI, "i2c [0x%02X] -> 0x%02X", reg, value);
return value;
--
1.7.9.2
