linux-kernel - Re: [PATCH v2 14/27] drm/sun4i: Don't check for panel or bridge on TV TCONs

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Message-ID: <20180613074621.5phumovcyymbkfbn@flea>
Date:   Wed, 13 Jun 2018 09:46:21 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     wens@...e.org, robh+dt@...nel.org, airlied@...ux.ie,
        gustavo@...ovan.org, maarten.lankhorst@...ux.intel.com,
        seanpaul@...omium.org, mark.rutland@....com,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 14/27] drm/sun4i: Don't check for panel or bridge on
 TV TCONs

On Tue, Jun 12, 2018 at 10:00:23PM +0200, Jernej Skrabec wrote:
> TV TCONs are always connected to TV or HDMI encoder, so it doesn't make
> sense to check if panel or bridge is connected to them.
> 
> Check if TCON has channel 0 and only then check for connected panel or
> bridges.
> 
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> ---
>  drivers/gpu/drm/sun4i/sun4i_tcon.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> index b1205a7bc20f..c9ffa5381185 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> @@ -1189,13 +1189,19 @@ static const struct component_ops sun4i_tcon_ops = {
>  static int sun4i_tcon_probe(struct platform_device *pdev)
>  {
>  	struct device_node *node = pdev->dev.of_node;
> +	const struct sun4i_tcon_quirks *quirks;
>  	struct drm_bridge *bridge;
>  	struct drm_panel *panel;
>  	int ret;
>  
> -	ret = drm_of_find_panel_or_bridge(node, 1, 0, &panel, &bridge);
> -	if (ret == -EPROBE_DEFER)
> -		return ret;
> +	quirks = of_device_get_match_data(&pdev->dev);

We should probably check ofr the pointer value before dereferencing it.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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