linux-kernel - Re: [PATCH] drm/bridge: dw-hdmi: Refuse DDC/CI transfers on the internal I2C controller

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Date:   Fri, 19 Jul 2019 12:23:26 -0400
From:   Adam Jackson <ajax@...hat.com>
To:     Matthias Kaehlcke <mka@...omium.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Douglas Anderson <dianders@...omium.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: dw-hdmi: Refuse DDC/CI transfers on the
 internal I2C controller

On Thu, 2019-07-18 at 14:41 -0700, Matthias Kaehlcke wrote:

> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 045b1b13fd0e..e49402ebd56f 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -35,6 +35,7 @@
>  
>  #include <media/cec-notifier.h>
>  
> +#define DDC_I2C_ADDR		0x37

This confused the heck out of me to read, DDC by definition happens
over I2C and this one address is just for a specific subset of DDC.
Perhaps this would be clearer if it was named DDC_CI_ADDR.

- ajax