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| author | Steve Sakoman <sakoman@gmail.com> | 2011-09-30 09:08:36 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2011-10-27 21:56:34 +0200 |
| commit | 353ffa7f93ab90655af2b194b7d0d16f106c297c (patch) | |
| tree | 2da82ab19b593cf6999371014917ae585c3f96a7 /board/overo | |
| parent | 14aa545c45f3f6d487c83b4fc3be19dd9f9e4e5b (diff) | |
| download | u-boot-imx-353ffa7f93ab90655af2b194b7d0d16f106c297c.zip u-boot-imx-353ffa7f93ab90655af2b194b7d0d16f106c297c.tar.gz u-boot-imx-353ffa7f93ab90655af2b194b7d0d16f106c297c.tar.bz2 | |
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.h | 6 |
1 files changed, 3 insertions, 3 deletions
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 @@ 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*/\ |