drm/i915: clear the entire sdvo infoframe buffer

Like in the case of native hdmi, which is fixed already in

commit adf00b26d18e1b3570451296e03bcb20e4798cdd
Author: Paulo Zanoni <[email protected]>
Date:   Tue Sep 25 13:23:34 2012 -0300

    drm/i915: make sure we write all the DIP data bytes

we need to clear the entire sdvo buffer to avoid upsetting the
display.

Since infoframe buffer writing is now a bit more elaborate, extract it
into it's own function. This will be useful if we ever get around to
properly update the ELD for sdvo. Also #define proper names for the
two buffer indexes with fixed usage.

v2: Cite the right commit above, spotted by Paulo Zanoni.

v3: I'm too stupid to paste the right commit.

v4: Ben Hutchings noticed that I've failed to handle an underflow in
my loop logic, breaking it for i >= length + 8. Since I've just lost C
programmer license, use his solution. Also, make the frustrated 0-base
buffer size a notch more clear.

Reported-and-tested-by: Jürg Billeter <[email protected]>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=25732
Cc: [email protected]
Cc: Paulo Zanoni <[email protected]>
Cc: Ben Hutchings <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

0 files changed, 0 insertions, 0 deletions