leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

omap: overo: Disable pull-ups on camera PCLK, HS and VS signals

Browse Source 
The level shifters used on the Caspa camera module have a 4k output
impedance. Combined with the 100uA pull-up resistors in the OMAP3,
this raises the ground level to 400mV. Adding crosstalk between the
pixel clock and the HS/VS signals on the flat cable (a ground line in
between would have been nice), logic 0 levels can raise up to 650mV.
This exceeds the camera input pins VIL maximum voltage.  This change
suggested-by Laurent Pinchart

Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
This commit is contained in:
Steve Sakoman 2011-09-30 09:08:36 +00:00 committed by Albert ARIBAUD
parent 14aa545c45
commit 353ffa7f93
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
board/overo/overo.h
View File

@ -160,10 +160,10 @@ const omap3_sysinfo sysinfo = {
MUX_VAL(CP(DSS_DATA22), (IDIS | PTD | DIS | M0)) /*DSS_DATA22*/\
MUX_VAL(CP(DSS_DATA23), (IDIS | PTD | DIS | M0)) /*DSS_DATA23*/\
/*CAMERA*/\
MUX_VAL(CP(CAM_HS), (IEN | PTU | EN | M0)) /*CAM_HS */\
MUX_VAL(CP(CAM_VS), (IEN | PTU | EN | M0)) /*CAM_VS */\
MUX_VAL(CP(CAM_HS), (IEN | PTU | DIS | M0)) /*CAM_HS */\
MUX_VAL(CP(CAM_VS), (IEN | PTU | DIS | M0)) /*CAM_VS */\
MUX_VAL(CP(CAM_XCLKA), (IDIS | PTD | DIS | M0)) /*CAM_XCLKA*/\
MUX_VAL(CP(CAM_PCLK), (IEN | PTU | EN | M0)) /*CAM_PCLK*/\
MUX_VAL(CP(CAM_PCLK), (IEN | PTU | DIS | M0)) /*CAM_PCLK*/\
MUX_VAL(CP(CAM_FLD), (IDIS | PTD | DIS | M4)) /*CAM_FLD*/\
MUX_VAL(CP(CAM_D0), (IEN | PTD | DIS | M0)) /*CAM_D0*/\
MUX_VAL(CP(CAM_D1), (IEN | PTD | DIS | M0)) /*CAM_D1*/\