[PATCH] video imx-ipu-fb: add clear screen

[Sascha Hauer]

On Fri, Sep 07, 2012 at 01:46:39PM +0300, Alex Gershgorin wrote:
> This patch clear screen before usage
> 
> Signed-off-by: Alex Gershgorin <alexg at meprolight.com>
> ---
>  drivers/video/imx-ipu-fb.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/video/imx-ipu-fb.c b/drivers/video/imx-ipu-fb.c
> index 8039de0..d46cced 100644
> --- a/drivers/video/imx-ipu-fb.c
> +++ b/drivers/video/imx-ipu-fb.c
> @@ -1012,6 +1012,10 @@ static int imxfb_probe(struct device_d *dev)
>  					       (info->bits_per_pixel >> 3));
>  		if (!fbi->info.screen_base)
>  			return -ENOMEM;
> +
> +		/* Clear the screen */
> +		memset((char *)fbi->info.screen_base, 0,
> +		info->xres * info->yres * (info->bits_per_pixel >> 3));

Not clearing the screen is intentional. Normally the fb drivers do not
enable the framebuffer until explicitely requested via fb0.enable=1. The
environment normally is supposed to set a picture on the screen and
enable it afterwards.

That said, we can clear the screen as with MMU enabled this probably
does not take long time. But then it should be done in the fb core.

Sascha


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