From 353ffa7f93ab90655af2b194b7d0d16f106c297c Mon Sep 17 00:00:00 2001 From: Steve Sakoman Date: Fri, 30 Sep 2011 09:08:36 +0000 Subject: 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 Signed-off-by: Sandeep Paulraj --- board/overo/overo.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'board/overo/overo.h') 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*/\ -- cgit v1.2.1