drm: edid: add support for E-DDC

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The current logic for probing ddc is limited to
2 blocks (256 bytes), this patch adds support
for the 4 block (512) data.

To do this, a single 8-bit segment index is
passed to the display via the I2C address 30h.
Data from the selected segment is then immediately
read via the regular DDC2 address using a repeated
I2C 'START' signal.

Signed-off-by: Shirish S <s.shirish@samsung.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Ville Syrjala <ville.syrjala@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

...

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Shirish S 2012-08-30 07:04:06 +00:00 • committed by Dave Airlie

parent 93eb58d53f

commit cd004b3f4c

1 changed files with 16 additions and 3 deletions

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drivers/gpu/drm/drm_edid.c

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