linux-kernel - Re: [PATCH] drm/fb-helper: pass physical dimensions to fbdev

Open Source and information security mailing list archives

Date:   Wed, 2 Aug 2017 11:46:38 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     David Lechner <david@...hnology.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [PATCH] drm/fb-helper: pass physical dimensions to fbdev

On Tue, Aug 01, 2017 at 10:26:41AM -0500, David Lechner wrote:
> The fbdev subsystem has a place for physical dimensions (width and height
> in mm) that is readable by userspace. Since DRM also knows these
> dimensions, pass this information to the fbdev device.
> 
> Signed-off-by: David Lechner <david@...hnology.com>

Still in the wrong function. Also please add some notation about what you
changed when resubmitting a patch (it took me a while to remember that I
replied to you already). That makes patch reviewing more efficient.

Thanks, Daniel

> ---
>  drivers/gpu/drm/drm_fb_helper.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 574af01..07a6621 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -1759,6 +1759,7 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
>  			    uint32_t fb_width, uint32_t fb_height)
>  {
>  	struct drm_framebuffer *fb = fb_helper->fb;
> +	int i;
>  
>  	info->pseudo_palette = fb_helper->pseudo_palette;
>  	info->var.xres_virtual = fb->width;
> @@ -1771,6 +1772,18 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
>  	info->var.height = -1;
>  	info->var.width = -1;
>  
> +	drm_fb_helper_for_each_connector(fb_helper, i) {
> +		struct drm_connector *connector =
> +			fb_helper->connector_info[i]->connector;
> +
> +		/* use the first connected connector for the physical dimensions */
> +		if (connector->status == connector_status_connected) {
> +			info->var.height = connector->display_info.width_mm;
> +			info->var.width = connector->display_info.height_mm;
> +			break;
> +		}
> +	}
> +
>  	switch (fb->format->depth) {
>  	case 8:
>  		info->var.red.offset = 0;
> -- 
> 2.7.4
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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