linux-kernel - Re: [PATCH 1/4] video: fsl-dcfb: Add dcfb framebuffer driver for LS1021A platform

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Date:	Mon, 01 Dec 2014 14:29:23 +0100
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	Xiubo Li <Li.Xiubo@...escale.com>
Cc:	plagnioj@...osoft.com, tomi.valkeinen@...com, shawn.guo@...aro.org,
	linux-fbdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] video: fsl-dcfb: Add dcfb framebuffer driver for LS1021A platform

On Monday 24 November 2014 18:20:51, Xiubo Li wrote:
> [...]
> +static int fsl_dcfb_init_fbinfo(struct fb_info *info)
> +{
> +	struct fsl_dcfb_mfb_info *mfbi = info->par;
> +	struct fb_var_screeninfo *var = &info->var;
> +	struct fsl_dcfb_fb_private *dcfb = mfbi->parent;
> +	struct device_node *np = dcfb->dev->of_node;
> +	struct device_node *dnp, *tnp;
> +	struct display_timings *timings;
> +	int i, ret;
> +
> +	dnp = of_parse_phandle(np, "display", 0);
> +	if (!dnp) {
> +		dev_err(dcfb->dev, "failed to find \"display\" phandle.\n");
> +		return -ENODEV;
> +	}
> +
> +	ret = of_property_read_u32(dnp, "bits-per-pixel",
> +				   &var->bits_per_pixel);
> +	if (ret < 0) {
> +		dev_err(dcfb->dev, "failed to get \"bits-per-pixel\" property.\n");
> +		goto put_dnp;
> +	}
> +
> +	timings = of_get_display_timings(dnp);
> +	if (!timings) {
> +		dev_err(dcfb->dev, "failed to get display timings\n");
> +		return -ENODEV;
> +		goto put_dnp;
> +	}
> +
> +	tnp = of_find_node_by_name(dnp, "display-timings");
> +	if (!tnp) {
> +		dev_err(dcfb->dev, "failed to find \"display-timings\" node\n");
> +		return -ENODEV;
> +		goto put_dnp;
> +	}
> +
> +	for (i = 0; i < of_get_child_count(tnp); i++) {
> +		struct videomode vm;
> +		struct fb_videomode fb_vm;
> +
> +		ret = videomode_from_timings(timings, &vm, i);
> +		if (ret < 0)
> +			goto put_tnp;
> +
> +		ret = fb_videomode_from_videomode(&vm, &fb_vm);
> +		if (ret < 0)
> +			goto put_tnp;
> +
> +		fb_add_videomode(&fb_vm, &info->modelist);
> +	}

Adding each display timing to the modelist here...

> [...]
> +	ret = fsl_dcfb_init_fbinfo(info);
> +	if (ret)
> +		goto err_cmap;
> +
> +	modelist = list_first_entry(&info->modelist,
> +			struct fb_modelist, list);
> +	fb_videomode_to_var(&info->var, &modelist->mode);

... and just picking the first here, essentially renders the "native-mode" property in device tree as useless, since only the first in that list is picked (which seems to be the last one inserted).

Best regards,
Alexander
-- 
Dipl.-Inf. Alexander Stein

SYS TEC electronic GmbH
Am Windrad 2
08468 Heinsdorfergrund
Tel.: 03765 38600-1156
Fax: 03765 38600-4100
Email: alexander.stein@...tec-electronic.com
Website: www.systec-electronic.com
 
Managing Director: Dipl.-Phys. Siegmar Schmidt
Commercial registry: Amtsgericht Chemnitz, HRB 28082

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