LCD scaling type

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

Hi !

When setting a mode on an LCD display that is not exactly the
native mode of that display, we can, on some chips, setup a
scaler. However, most of the time, we have 2 difference choices
for setting up this scaler: It can preserve or not preserve
the aspect ratio. A typical example is the titnium powerbook's 1152x768
mode. If I set it to 1024x768, I can get either horizontal scaling (not
preserving aspect ratio) or no scaling with black bars on left & right
(preserving aspect ratio).

While in most case you actually want to preserve the aspect ratio, it
would still I beleive make sense to let the user choose it. 

Could we define one of the reserved fields in fb_var_screeninfo as
beeing a "flags" field for such things ? There are a couple of other
things that we may want to stuff into such a bitfield later, I'd suggest
reserving one 32 bits field for such flags.

Ben.

-- 
Benjamin Herrenschmidt <benh@kernel.crashing.org>


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