linux-kernel - Re: [PATCH v4 05/11] drm: Add Allwinner A10 Display Engine support

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Date:	Tue, 26 Apr 2016 11:14:19 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
	Rob Herring <robh+dt@...nel.org>,
	Daniel Vetter <daniel@...ll.ch>,
	Hans de Goede <hdegoede@...hat.com>,
	devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-sunxi@...glegroups.com, dri-devel@...ts.freedesktop.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Alexander Kaplan <alex@...tthing.co>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v4 05/11] drm: Add Allwinner A10 Display Engine support

Hi Maxime,

On Mon, 25 Apr 2016 15:22:46 +0200
Maxime Ripard <maxime.ripard@...e-electrons.com> wrote:

> The Allwinner A10 and subsequent SoCs share the same display pipeline, with
> variations in the number of controllers (1 or 2), or the presence or not of
> some output (HDMI, TV, VGA) or not.
> 
> Add a driver with a limited set of features for now, and we will hopefully
> support all of them eventually
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Just 2 comments below. Once addressed you can add my

Reviewed-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

> ---

[...]

> +
> +static int sun4i_drv_connector_plug_all(struct drm_device *drm)
> +{
> +	struct drm_connector *connector, *failed;
> +	int ret;
> +
> +	mutex_lock(&drm->mode_config.mutex);
> +	list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
> +		ret = drm_connector_register(connector);
> +		if (ret) {
> +			failed = connector;
> +			goto err;
> +		}
> +	}
> +	mutex_unlock(&drm->mode_config.mutex);
> +	return 0;
> +
> +err:
> +	list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
> +		if (failed == connector)
> +			break;
> +
> +		drm_connector_unregister(connector);
> +	}
> +	mutex_unlock(&drm->mode_config.mutex);
> +
> +	return ret;
> +}

You can use the generic drm_connector_register_all() to do that.

[...]

> +
> +static void sun4i_drv_unbind(struct device *dev)
> +{
> +	struct drm_device *drm = dev_get_drvdata(dev);
> +

And you probably miss a call to drm_connector_unregister_all() here.

> +	drm_dev_unregister(drm);
> +	drm_kms_helper_poll_fini(drm);
> +	sun4i_framebuffer_free(drm);
> +	drm_vblank_cleanup(drm);
> +	drm_dev_unref(drm);
> +}


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com