linux-kernel - Re: [PATCH] video: OF display-timings support for ocfb

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Date:	Wed, 18 Jun 2014 00:08:30 +0300
From:	Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
To:	Franck Jullien <franck.jullien@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
	tomi.valkeinen@...com, plagnioj@...osoft.com
Subject: Re: [PATCH] video: OF display-timings support for ocfb

On Wed, Jun 11, 2014 at 10:17:51PM +0200, Franck Jullien wrote:
> Signed-off-by: Franck Jullien <franck.jullien@...il.com>
> ---
>  drivers/video/fbdev/Kconfig |    2 ++
>  drivers/video/fbdev/ocfb.c  |   31 ++++++++++++++++++++++++++-----
>  2 files changed, 28 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
> index e1f4727..b4ac6bb 100644
> --- a/drivers/video/fbdev/Kconfig
> +++ b/drivers/video/fbdev/Kconfig
> @@ -942,6 +942,8 @@ config FB_OPENCORES
>  	select FB_CFB_FILLRECT
>  	select FB_CFB_COPYAREA
>  	select FB_CFB_IMAGEBLIT
> +	select VIDEOMODE_HELPERS
> +	select FB_MODE_HELPERS
>  	help
>  	  This enables support for the OpenCores VGA/LCD core.
>  
> diff --git a/drivers/video/fbdev/ocfb.c b/drivers/video/fbdev/ocfb.c
> index 7f9dc9b..6d15565 100644
> --- a/drivers/video/fbdev/ocfb.c
> +++ b/drivers/video/fbdev/ocfb.c
> @@ -22,6 +22,8 @@
>  #include <linux/string.h>
>  #include <linux/slab.h>
>  
> +#include <video/of_display_timing.h>
> +
>  /* OCFB register defines */
>  #define OCFB_CTRL	0x000
>  #define OCFB_STAT	0x004
> @@ -310,11 +312,30 @@ static int ocfb_probe(struct platform_device *pdev)
>  	fbdev->info.device = &pdev->dev;
>  	fbdev->info.par = fbdev;
>  
> -	/* Video mode setup */
> -	if (!fb_find_mode(&fbdev->info.var, &fbdev->info, mode_option,
> -			  NULL, 0, &default_mode, 16)) {
> -		dev_err(&pdev->dev, "No valid video modes found\n");
> -		return -EINVAL;
> +	if (!mode_option && IS_ENABLED(CONFIG_OF)) {
> +		struct fb_videomode mode;
> +		u32 bpp;
> +
> +		ret = of_get_fb_videomode(pdev->dev.of_node, &mode,
> +					  OF_USE_NATIVE_MODE);
> +		if (ret)
> +			return ret;
> +
> +		fb_videomode_to_var(&fbdev->info.var, &mode);
> +
> +		ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel",
> +					   &bpp);
> +		if (ret)
> +			return ret;
> +
> +		fbdev->info.var.bits_per_pixel = bpp;
> +
> +	} else {
> +		if (!fb_find_mode(&fbdev->info.var, &fbdev->info, mode_option,
> +				  NULL, 0, &default_mode, 16)) {
> +			dev_err(&pdev->dev, "No valid video modes found\n");
> +			return -EINVAL;
> +		}
>  	}
>  	ocfb_init_var(fbdev);
>  	ocfb_init_fix(fbdev);


Nice, this was something that was discussed as a possible future improvement
when I first posted this driver.

Acked-by: Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
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