linux-kernel - Re: [PATCH] drm/fb-helper: improve DRM fbdev emulation device names

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Date:   Fri, 21 May 2021 17:33:44 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Robinson <pbrobinson@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/fb-helper: improve DRM fbdev emulation device names

On Fri, May 21, 2021 at 03:19:10PM +0200, Javier Martinez Canillas wrote:
> Framebuffer devices that are registered by DRM drivers for fbdev emulation
> have a "drmfb" suffix in their name. But makes them to be quite confusing
> if a driver already has "drm" in its name:
> 
> $ cat /proc/fb
> 0 rockchipdrmdrmfb
> 
> $ cat /proc/fb
> 0 simpledrmdrmfb
> 
> Instead, let's just add a "-fb" suffix to denote that are DRM drivers FB:
> 
> $ cat /proc/fb
> 0 rockchipdrm-fb
> 
> $ cat /proc/fb
> 0 simpledrm-fb
> 
> Suggested-by: Peter Robinson <pbrobinson@...il.com>
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>

So what with all the drivers which do _not_ have drm in their name? Also
I'm never sure how much these are uapi or not ...
-Daniel

> ---
> 
>  drivers/gpu/drm/drm_fb_helper.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index f6baa204612..bbaff92c509 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -1737,7 +1737,7 @@ void drm_fb_helper_fill_info(struct fb_info *info,
>  			       sizes->fb_width, sizes->fb_height);
>  
>  	info->par = fb_helper;
> -	snprintf(info->fix.id, sizeof(info->fix.id), "%sdrmfb",
> +	snprintf(info->fix.id, sizeof(info->fix.id), "%s-fb",
>  		 fb_helper->dev->driver->name);
>  
>  }
> -- 
> 2.31.1
> 

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