linux-kernel - Re: [PATCH v8] drm/sun4i: hdmi: Implement I2C adapter for A10s DDC bus

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Message-ID: <20170704195422.hsi4lhzlqb75gm4n@flea>
Date:   Tue, 4 Jul 2017 21:54:22 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Jonathan Liu <net147@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v8] drm/sun4i: hdmi: Implement I2C adapter for A10s DDC
 bus

Hi,

On Sun, Jul 02, 2017 at 05:27:10PM +1000, Jonathan Liu wrote:
> The documentation for drm_do_get_edid in drivers/gpu/drm/drm_edid.c states:
> "As in the general case the DDC bus is accessible by the kernel at the I2C
> level, drivers must make all reasonable efforts to expose it as an I2C
> adapter and use drm_get_edid() instead of abusing this function."
> 
> Exposing the DDC bus as an I2C adapter is more beneficial as it can be used
> for purposes other than reading the EDID such as modifying the EDID or
> using the HDMI DDC pins as an I2C bus through the I2C dev interface from
> userspace (e.g. i2c-tools).
> 
> Implement this for A10s.
> 
> Signed-off-by: Jonathan Liu <net147@...il.com>

Thanks for your work on this, I've queued it in 3.14.

It will appear in my branches and next as soon as 3.13-rc1 is out.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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