[U-Boot] [PATCH] video: ct6900: Add an option to skip video initialization

[Stefan Roese]

Hi Wolfgang,

On Thursday 14 May 2009 15:37:15 Wolfgang Denk wrote:
> > This patch adds an option to skip the video initialization on the
> > ct6900. This is needed for the CPCI750 which can be built as CPCI
> > host and adapter/target board. And the adapter board can't access the
> > video cards.
>
> Hm... why do you change the code of the viseo driver then? This change
> should be local to the CPCI750 board only.

I would love to do it this way. It's not possible though. At least I don't see 
such a solution.

> > +/*
> > + * Implement a weak default function for boards that optionally
> > + * need to skip the video initialization.
> > + */
> > +int __board_video_skip(void)
> > +{
> > +	return 0;
> > +}
> > +int board_video_skip(void) __attribute__((weak,
> > alias("__board_video_skip"))); +
> > 
> > /************************************************************************
> >******* *
> >  * Init video chip
> > @@ -982,8 +992,12 @@ video_hw_init (void)
> >  	struct ctfb_res_modes *res_mode;
> >  	struct ctfb_res_modes var_mode;
> >  	struct ctfb_chips_properties *chips_param;
> > -	/* Search for video chip */
> >
> > +	/* Check if video initialization should be skipped */
> > +	if (board_video_skip())
> > +		return NULL;
>
> This makes no sense  to  me.  Instead  of  adding  a  (basicly  board
> specific,  even if you hide it with the weak implementation) shortcut
> to video_hw_init() you should not initialize the video driver on this
> board at all, leaving the video driver code unchanged.

Then please let me know how this can be accomplished. The CPCI750 uses the 
same U-Boot image both for the video-enabled CPCI-host version and for the 
video-disabled CPCI-adapter version. The video driver is not called from 
within the CPCI750 board files. It's called from drivers/video/cfb_console.c. 

Thanks.

Best regards,
Stefan

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