Re: [PATCH v2 01/10] drm/client: Test for connectors before sending hotplug event

From: Javier Martinez Canillas <javierm@redhat.com>
To: Thomas Zimmermann <tzimmermann@suse.de>,
	airlied@gmail.com, daniel@ffwll.ch,
	maarten.lankhorst@linux.intel.com, mripard@kernel.org
Cc: dri-devel@lists.freedesktop.org,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org,
	intel-gfx@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
	freedreno@lists.freedesktop.org, amd-gfx@lists.freedesktop.org,
	linux-tegra@vger.kernel.org
Subject: Re: [PATCH v2 01/10] drm/client: Test for connectors before sending hotplug event
Date: Wed, 25 Jan 2023 09:30:42 +0100	[thread overview]
Message-ID: <296bcff0-9d75-3d6b-e101-dddb26edadf1@redhat.com> (raw)
In-Reply-To: <20230124134010.30263-2-tzimmermann@suse.de>

Hello Thomas,

On 1/24/23 14:40, Thomas Zimmermann wrote:
> Test for connectors in the client code and remove a similar test
> from the generic fbdev emulation. Do nothing if the test fails.
> Not having connectors indicates a driver bug.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>

but I've a question below.

>  drivers/gpu/drm/drm_client.c        | 5 +++++
>  drivers/gpu/drm/drm_fbdev_generic.c | 5 -----
>  2 files changed, 5 insertions(+), 5 deletions(-)

[...]

> --- a/drivers/gpu/drm/drm_fbdev_generic.c
> +++ b/drivers/gpu/drm/drm_fbdev_generic.c
> @@ -389,11 +389,6 @@ static int drm_fbdev_client_hotplug(struct drm_client_dev *client)
>  	if (dev->fb_helper)
>  		return drm_fb_helper_hotplug_event(dev->fb_helper);
>  
> -	if (!dev->mode_config.num_connector) {
> -		drm_dbg_kms(dev, "No connectors found, will not create framebuffer!\n");
> -		return 0;
> -	}
> -

What about the following code snippet:

	if (!drm_drv_uses_atomic_modeset(dev))
		drm_helper_disable_unused_functions(dev);

that seems to be something that should be in the core client dev hotplug
as well, since it isn't specific to the fbdev emulation client ?

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel