Currently, a long set of viafb options are needed to get the XO-1.5
laptop to output video (there is only 1 configuration that works, that
can't really be autodetected).

This patch automatically detects and configures viafb for the XO-1.5
laptop, meaning all that is required for working display is that
viafb is loaded.
Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This trivial patch removes unused mode tables.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

The current code might result in trying to remap 512MB video ram on
a 32 bit system which is quite likely to fail.
This patch tries to map less of it down to 8MB as this should still
be enough to get a reasonably well working framebuffer. This should
make viafb work for many people without requiring them to manually
allocate more space.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This can give a speed up of factor 6-9, which is quite notable.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

Conflicts:
	drivers/video/via/viamode.c
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch adds a config option to be compatible with X servers like
OpenChrome. This is required as for example the X server does not
handle things like disabled IGAs/PLLs resulting in a potential
freeze on X startup. With this option disabled we can provide some
nice features like power management and not reinitializing the
hardware on every mode switch (taking long time, causing flickering).
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

When allowing some PLL calculation we get a frequency that seems to
be a bit higher than what the OLPC DCON likes resulting in a still
readable but not so good image. We don't really know whether this is
a problem with the calculation formula or the OLPC but as other
displays seem to be happy with the other modes adjusting the OLPC
refresh looks like the better thing. This patch prevents a
regression when dynamic PLL calculation is allowed.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch fixes the devices connected on OLPC. The OLPC panel seems
to be connected to DVP1 and LVDS2 for some reasons and if not both
are handled correct the display does not work correct or not at all.
This patch prevents regressions on the OLPC where it worked by
accident but would break in future as the driver did not know the
correct devices connected. This might also fix hardware scaling.
Hopefully the OLPC is the only device with such a requirement but it
will be certainly better to actually know what devices are actually
connected and to not work by accident.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch fixes a regression introduced by
	fd3cc698a
	"viafb: remove duplicated clock storage"
caused by an incosistent mode which pretended to have a higher
refresh rate than it actually had. The wrong refresh rate resulted
in a calculated higher pixclock which the OLPC DCON could not handle.
By reducing the refresh rate to 50Hz we get close to the old
pixclock which makes the OLPC display usable again.
Minor other adjustments are needed as 60Hz is assumed to be a safe
value which is not true for OLPC DCON. This is no problem as we only
support 1200x900 on the OLPC.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Reported-by: Daniel Drake <dsd@laptop.org>

We do this also in the real program code so there is no reason to
do it here too (and here it's hardly readable).
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch replaces OK/FAIL by true/false which is simpler and saner.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

We do not need viafb_second{,_virtual}_{xres,yres} outside of
viafbdev.c so move them there and eliminate the virtual ones where
the only sane usage is done during initalization.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch moves all unprotected VGA initialization in one table and
provides some documentation for those values.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch adds support for enabling and configuring the engine on
VIAs IGPs. This is the main clock used for everything but pixel
output.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch introduces dummy functions to execute when we don't know
what we should do (due to missing documentation). They do nothing
but print a nice message in the log explaining the situation.
To trigger this message initial power management support is
activated which might save a bit energy by disabling PLL and clock
if no device is configured to use them.

Note: The message is only shown for the oldest IGPs CLE266 and K400
      as for the other platforms there are reasonable assumptions
      how it does (hopefully) work.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch is a huge move operation with some rename and introduces
an interface to still use the functions. This should be a step in
the right direction to reuse the code whenever possible but cleanly
separate code that differs on different platform and keeping the
complexity as low as possible.
pll_config was renamed to via_pll_config to keep the naming scheme.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch adds functions to enable/disable the display clocks.
It also fixes a tiny bug that slipped in with a previous commit but
could not yet have caused any problems.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch adds some support for clock source selection as well as
PLL power management. The code is unused at the moment but was
successfully tested as far as possible.
The implementation is according to the documentation for VX700,
VX800, VX855, VX900. Probably the source selection works like this
starting with K800 and the power managemennt at least since VX700.
(guessed based on the initialization in viamode.c)
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch splits some functionality to extra functions.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

As no caller is interested in the result call viafb_get_clk_value
directly from viafb_set_vclock to encapsulate the hardware dependend
stuff there.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch removes the max_hres and max_vres which are not used at
the moment. In general they could be useful but it would be better
to get them via any standard EDID implementation and not the buggy
incomplete one currently used which is also removed as far as
possible.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch allows calculating the pll multiplier within limits based
on the previous table. All available information supports that it
should be possible/sane to choose the multiplier free within some
ranges.
Storing the multiplier ranges instead of lots of pll configurations
reduces the memory needed and may as well improve the performance.
It is also expected to provide better pll values resulting in better
frequencies for the connected devices.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

As the iga path is the only remaining information which is also
handled by the active devices there is no reason to keep it.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

Later the correct values will be written so there is no need to
write early some values which might be wrong.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This moves some mode independend initialization code to the function
where the other parts of the initialization are.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch initializes the margins for the initial mode correct.
This is required to get the desired initial refresh rate. Also do
more verbose sanity checking to prevent misbehavior.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch fixes multiple issues with the handling of refresh rates
especially for multi-display setups. If you experienced problems
with wrong refresh rates this patch might fix them.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch splits the pll configs up on pll versions. This allows
easy adding of other known good pll values. Additionally it made it
possible to remove invalid configurations resulting in better
behaviour for such cases. The resulting clocks are no longer stored
resulting in some computing overhead on each mode change.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

The clocks can be easily recalculated by the timing and refresh value.
This brings us one step closer to removing VIAs modetable and use
generic ones and being easier extensible.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

Before this patch only clocks that perfectly match were used and if
none existed this was not handled properly. This patch changes this
to always use the closest clock supported. This should behave like
before for clocks that have a perfect match but be much saner for
clocks which are slightly off.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch removes the direct lookup table for resolution+refresh and
pixclock by calculating this information from the mode table. Removes a
lot of dupllication and error potential by just doing a little more
calculations on each mode change.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

These parameters are the same for all currently known VIA IGPs so it
does not make any sense to store them with IGP specific data. This
saves a few bytes and helps a bit in dicovering the real differences.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch removes some write-only variables from the device management
structures. Just a small cleanup.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch is a little cleanup for the chip_info structures.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This patch removes all internal uses of another mostly artificial
value. It does duplicate the information of the maximum resolution and
it is not flexible as only a few resolutions exist. Hence it is better
to remove it and clean the mess up.
No runtime change expected.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

Many local variables should be declared static.
Found by sparse, compile tested only.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

This driver is not respecting the iomem memory space restrictions
and does direct access. This works on x86 but is non-portable and
should not be done.  Converted memcpy() of 2 to readw.
Last post increment of romptr was unnecessary since pointer never
used after that.

Found by sparse, compile tested only.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>