New camera sensor SIV121C

[James Cameron]

On Fri, Jun 06, 2014 at 09:26:31AM -0400, Paul Fox wrote:
>  > On Wed, Jun 4, 2014 at 9:38 PM, James Cameron <quozl at laptop.org> wrote:
>  > > We have begun qualification of a new camera sensor SIV121C for
>  > > production of the XO-1.75 and XO-4 laptops.
>  > ...
>  > 
>  > > The new sensor does a little bit better at low light levels, as a
>  > > result of a different analog to digital conversion method.
> 
> i noticed on trac that you're supporting the new sensor on 1.5.  for
> replacement purposes?

yes, that's my hope.  i'm assessing that now.

i've an XO-1.5 motherboard, display, and sensor stacked, and have been
fiddling with new bits in the sensor registers; output drive
capability select [1].

the XO-1.75 and XO-4 work best with 3mA for the pixel clock and "other
outputs", which are the data lines.  at 8.2mA there are occasional
corruptions from bright parts of a scan line to the rest of the line,
with the condition clearing for the next scan line.

the XO-1.5 works best with 8.2mA for both.  at 3mA the data is certainly
corrupt, at 5.6mA it is occasionally corrupt, and at 8.2mA it is
rarely corrupt.


references:

1.  siv121c-config CHIP_CNTR in
    http://code.coreboot.org/p/openfirmware/source/commit/3727/

-- 
James Cameron
http://quozl.linux.org.au/