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authorSteve Sakoman <sakoman@gmail.com>2011-09-30 09:08:36 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2011-10-27 21:56:34 +0200
commit353ffa7f93ab90655af2b194b7d0d16f106c297c (patch)
tree2da82ab19b593cf6999371014917ae585c3f96a7 /board/overo
parent14aa545c45f3f6d487c83b4fc3be19dd9f9e4e5b (diff)
downloadu-boot-353ffa7f93ab90655af2b194b7d0d16f106c297c.tar.gz
omap: overo: Disable pull-ups on camera PCLK, HS and VS signals
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>
Diffstat (limited to 'board/overo')
-rw-r--r--board/overo/overo.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/board/overo/overo.h b/board/overo/overo.h
index 42ef1b1dff..915f15bf10 100644
--- a/board/overo/overo.h
+++ b/board/overo/overo.h
@@ -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*/\