Hi Vladimir,

Am Montag, den 31.08.2015, 00:34 +0300 schrieb Vladimir Zapolskiy:

The change adds support of internal HDMI I2C master controller, this
subdevice is used by default, if "ddc-i2c-bus" DT property is omitted.

I think this should be mentioned in
Documentation/devicetree/bindings/drm/bridge/dw_hdmi.txt

The main purpose of this functionality is to support reading EDID from
an HDMI monitor on boards, which don't have an I2C bus connected to
DDC pins.

The current implementation does not support "I2C Master Interface
Extended Read Mode" to read data addressed by non-zero segment
pointer, this means that if EDID has more than 1 extension blocks,
EDID reading operation won't succeed, in my practice all tested HDMI
monitors have at maximum one extension block.

Signed-off-by: Vladimir Zapolskiy <redacted>
---
The change is based on today's v4.2, please let me know, if it should be rebased.

The change has compilation dependency on I2CM_ADDRESS register name fix,
see http://lists.freedesktop.org/archives/dri-devel/2015-May/082980.html

From http://lists.freedesktop.org/archives/dri-devel/2015-May/082981.html
v1 of the change was

  Tested-by: Philipp Zabel [off-list ref]

but I hesitate to add the tag here due to multiple updates in v2.

Tested again, v2 still works fine on Nitrogen6X with HDMI monitor.

regards
Philipp