Re: Terratec Grabby hwrev 2

[Timo Teras <timo.teras@iki.fi>]

On Thu, 28 Mar 2013 15:35:56 +0200
Timo Teras <timo.teras@iki.fi> wrote:

> On Thu, 28 Mar 2013 09:40:52 -0300
> Mauro Carvalho Chehab <mchehab@redhat.com> wrote:
> 
> > Em Thu, 28 Mar 2013 10:52:01 +0200
> > Timo Teras <timo.teras@iki.fi> escreveu:
> > 
> > > On Wed, 27 Mar 2013 16:10:49 +0200
> > > Timo Teras <timo.teras@iki.fi> wrote:
> > > 
> > > > On Tue, 26 Mar 2013 10:20:56 +0200
> > > > Timo Teras <timo.teras@iki.fi> wrote:
> > > > 
> > > > > I did manage to get decent traces with USBlyzer evaluation
> > > > > version.
> > > > 
> > > > Nothing _that_ exciting there. Though, there's quite a bit of
> > > > differences on certain register writes. I tried copying the
> > > > changed parts, but did not really help.
> > > > 
> > > > Turning on saa7115 debug gave:
> > > > 
> > > > saa7115 1-0025: chip found @ 0x4a (ID 000000000000000) does not
> > > > match a known saa711x chip.
> > > 
> > > Well, I just made saa7115.c ignore this ID check, and defeault to
> > > saa7113 which is apparently the chip used.
> > > 
> > > And now it looks like things start to work a lot better.
> > > 
> > > Weird that the saa7113 chip is missing the ID string. Will
> > > continue testing.
> > 
> > That could happen if saa7113 is behind some I2C bridge and when
> > saa7113 is not found when the detection code is called.
> 
> Smells to me that they replaced the saa7113 with cheaper clone that
> does not support the ID string.
> 
> Sounds like the same issue as:
> http://www.spinics.net/lists/linux-media/msg57926.html
> 
> Additionally noted that something is not initialized right:
> 
> With PAL signal:
> - there's some junk pixel in beginning of each line (looks like pixes
>   from previous lines end), sync issue?
> - some junk lines at the end
> - distorted colors when white and black change between pixels

Still have not figured out this one. Could be probably related to the
saa7113 differences.

> With NTSC signal:
> - unable to get a lock, and the whole picture looks garbled

NTSC started working after I removed all the saa711x writes to
following registers:
 R_14_ANAL_ADC_COMPAT_CNTL
 R_15_VGATE_START_FID_CHG
 R_16_VGATE_STOP
 R_17_MISC_VGATE_CONF_AND_MSB

- Timo