commit 2498ad333373ca9ae7dbeafd570379650a0a15cc
author Steve Sakoman <sakoman@gmail.com> Fri Sep 30 09:08:36 2011 +0000
committer Albert ARIBAUD <albert.u.boot@aribaud.net> Thu Oct 27 21:56:34 2011 +0200
tree 2da82ab19b593cf6999371014917ae585c3f96a7
parent 9aff406915ec0fe4b5385242dc9524960442af7b

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>

board/overo/overo.h

diff --git a/board/overo/overo.h b/board/overo/overo.h
index 42ef1b1..915f15b 100644
--- a/board/overo/overo.h
+++ b/board/overo/overo.h
@@ -160,10 +160,10 @@
 	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*/\