From: Albert ARIBAUD <albert.u.boot@aribaud.net>
To: u-boot@lists.denx.de
Subject: [U-Boot] omap: overo: Disable pull-ups on camera PCLK, HS and VS signals
Date: Fri, 14 Oct 2011 22:16:16 +0200 [thread overview]
Message-ID: <4E989890.4080302@aribaud.net> (raw)
In-Reply-To: <CAGDS+nnencSqzR8-YWWhXZf_gxmR8s0isA3H6oC9to40YSnYBg@mail.gmail.com>
Hi Steve,
Le 30/09/2011 21:08, Steve Sakoman a ?crit :
> 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>
> ---
>
> 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*/\
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
>
>
Applied to u-boot-arm/master, thanks.
Amicalement,
--
Albert.
prev parent reply other threads:[~2011-10-14 20:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-30 19:08 [U-Boot] omap: overo: Disable pull-ups on camera PCLK, HS and VS signals Steve Sakoman
2011-10-14 20:16 ` Albert ARIBAUD [this message]
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