linux-kernel - Re: [PATCH v2 06/12] drm/sun4i: sun6i_mipi_dsi: Probe tcon0 during dsi

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Date:   Mon, 19 Nov 2018 09:38:33 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Icenowy Zheng <icenowy@...c.io>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Michael Trimarchi <michael@...rulasolutions.com>,
        TL Lim <tllim@...e64.org>, linux-sunxi@...glegroups.com,
        linux-amarula@...rulasolutions.com
Subject: Re: [PATCH v2 06/12] drm/sun4i: sun6i_mipi_dsi: Probe tcon0 during
 dsi_bind

On Fri, Nov 16, 2018 at 10:09:10PM +0530, Jagan Teki wrote:
> Probe tcon0 during dsi_bind, so-that the tcon attributes like
> divider value, clock rate can get whenever it need.
> 
> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> ---
>  drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 7 +++++++
>  drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 1 +
>  2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> index d60955880c43..66a01061e51d 100644
> --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> @@ -25,6 +25,7 @@
>  #include <drm/drm_panel.h>
>  
>  #include "sun4i_drv.h"
> +#include "sun4i_tcon.h"
>  #include "sun6i_mipi_dsi.h"
>  
>  #include <video/mipi_display.h>
> @@ -1007,6 +1008,7 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master,
>  	struct drm_device *drm = data;
>  	struct sun4i_drv *drv = drm->dev_private;
>  	struct sun6i_dsi *dsi = dev_get_drvdata(dev);
> +	struct sun4i_tcon *tcon0 = sun4i_get_tcon0(drm);
>  	int ret;
>  
>  	if (!dsi->panel)
> @@ -1014,6 +1016,11 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master,
>  
>  	dsi->drv = drv;
>  
> +	if (!tcon0)
> +		return -EPROBE_DEFER;

You can't fall in that condition. The component framework won't call
bind unless every components have been probed.

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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