From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maxime Ripard <maxime.ripard-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>
Subject: Re: [PATCH v2 06/12] drm/sun4i: sun6i_mipi_dsi: Probe
 tcon0 during dsi_bind
Date: Mon, 19 Nov 2018 09:38:33 +0100
Message-ID: <20181119083833.d7ysiv3tenabtrdj@flea>
References: <20181116163916.29621-1-jagan@amarulasolutions.com>
 <20181116163916.29621-7-jagan@amarulasolutions.com>
Reply-To: maxime.ripard-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha256;
	protocol="application/pgp-signature"; boundary="kutx34ipl3nfzbct"
Return-path: <linux-sunxi+bncBDSJBYGBRIMBBCXNZHPQKGQEJJIGRAY-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
Sender: linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
Content-Disposition: inline
In-Reply-To: <20181116163916.29621-7-jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
List-Post: <https://groups.google.com/group/linux-sunxi/post>, <mailto:linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
List-Help: <https://groups.google.com/support/>, <mailto:linux-sunxi+help-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
List-Archive: <https://groups.google.com/group/linux-sunxi
List-Subscribe: <https://groups.google.com/group/linux-sunxi/subscribe>, <mailto:linux-sunxi+subscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
List-Unsubscribe: <mailto:googlegroups-manage+1076902468213+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>,
 <https://groups.google.com/group/linux-sunxi/subscribe>
To: Jagan Teki <jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
Cc: Maarten Lankhorst <maarten.lankhorst-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>, Sean Paul <sean-p7yTbzM4H96eqtR555YLDQ@public.gmane.org>, David Airlie <airlied-cv59FeDIM0c@public.gmane.org>, Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>, Icenowy Zheng <icenowy-h8G6r0blFSE@public.gmane.org>, Jernej Skrabec <jernej.skrabec-gGgVlfcn5nU@public.gmane.org>, Vasily Khoruzhick <anarsoul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>, dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Michael Trimarchi <michael-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>, TL Lim <tllim-F7SikzrIcFYdnm+yROfE0A@public.gmane.org>, linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, linux-amarula-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org
List-Id: devicetree@vger.kernel.org


--kutx34ipl3nfzbct
Content-Type: text/plain; charset="UTF-8"
Content-Disposition: inline

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-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
> ---
>  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
--kutx34ipl3nfzbct--