Re: [PATCH v4 14/23] drm/tilcdc: Provide ddc symlink in connector sysfs directory

From: Sam Ravnborg <sam-uyr5N9Q2VtJg9hUCZPvPmw@public.gmane.org>
To: Andrzej Pietrasiewicz
	<andrzej.p-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
Cc: Neil Armstrong
	<narmstrong-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>,
	Maxime Ripard
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	dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Matthias Brugger
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	Thierry Reding
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	Laurent Pinchart
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	Shawn Guo <shawnguo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
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	Jyri Sarha <jsarha-l0cyMroinI0@public.gmane.org>,
	Alexios Zavras <alexios.zavras@>
Subject: Re: [PATCH v4 14/23] drm/tilcdc: Provide ddc symlink in connector sysfs directory
Date: Tue, 23 Jul 2019 11:05:32 +0200	[thread overview]
Message-ID: <20190723090532.GA787@ravnborg.org> (raw)
In-Reply-To: <d1d415022c598fb7acd033f0f322dd67250adaa9.1562843413.git.andrzej.p-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>

Hi Andrzej

On Thu, Jul 11, 2019 at 01:26:41PM +0200, Andrzej Pietrasiewicz wrote:
> Use the ddc pointer provided by the generic connector.
> 
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
> ---
>  drivers/gpu/drm/tilcdc/tilcdc_tfp410.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_tfp410.c b/drivers/gpu/drm/tilcdc/tilcdc_tfp410.c
> index 62d014c20988..c373edb95666 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_tfp410.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_tfp410.c
> @@ -219,6 +219,7 @@ static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
>  	tfp410_connector->mod = mod;
>  
>  	connector = &tfp410_connector->base;
> +	connector->ddc = mod->i2c;
>  
>  	drm_connector_init(dev, connector, &tfp410_connector_funcs,
>  			DRM_MODE_CONNECTOR_DVID);

When reading this code, it looks strange that we set connector->ddc
*before* the call to init the connector.
One could risk that drm_connector_init() used memset(..) to clear all
fields or so, and it would break this order.
As it is today the code works as I read it.

	Sam
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