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This also changes some bit operations to use a "bitfield" equivalent
one, with named fields, that should make it easier to understand what
is being tested.
The enum smi_cli_cmd_code in smi_501.h is code that was added to a
experimental smi_drm.h, but the hardware only supports basic 2d accel,
and to compensate for the extra overhead for maintaining a command
list (assuming it worked correctly) it would be required to have a
special handling, like calling an ioctl to do the "busy loop" in the
kernel (that is, should wait for an irq or a timeout).
The problem is that even if waiting for a idle engine before crafting
a command, and waiting again after submitting the command, there would
be corruption on screen after some time. So, the "busy loop" in the
kernel would only be useful if still using direct writes to mmio
registers.
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DGA was also not being properly test to not enable the pSmi fields,
but since the dga implementation is very basic, it is better to just
remove it (if compiling the sources on pre 1.4 X Server, DGA will be
disabled).
The polylines code in xmi_xaa.c was already if 0'ed for some time,
but it may be reinstantiated to accelerate (back) xaa rotated modes.
Currently only randr+exa accelerates rotated modes.
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The LEAVE() macro, when debug is disabled, now is defined as:
<hash>define LEAVE(...) return __VA_ARGS__
This avoids the requirement of a return statement after the LEAVE()
macro call, what can be confusing.
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This code is an adaptation of SMI sample implementation.
CSCVideo is an alternate way to render video, that should reduce memory
bandwidth usage, and uses the color space conversion hardware to render
video directly to the framebuffer memory.
When using randr dual head mode, currently only XAA is supported. As it
has a fixed format framebuffer (when using the Virtual xorg.conf option).
This patch also ensures that pScrn->displayWidth, pScrn->virtualX and
pScrn->virtualY are only changed by the driver when using EXA.
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pSmi->IsSecondary was not used, and there should not exist two
instances of the driver managing the same card.
Macro CHECK_SECONDARY() was dependant on a second instance of the driver
for the same card, and also removed.
Some rework should still be done in the cursor code, as it sometimes,
when displaying different data, will leave the hw cursor visible, while
using an argb cursor.
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Also done some clean up, like removing unused/redundant members of the
screen private structure, and removing now unused configuration file
options.
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WaitQueue() did receive an unused parameter, that was removed. The
parameter was unused since version 1.0 in XFree86 CVS, so probably
nobody knows for what it was used.
WaitIdle() now also replaces WaitIdleEmpty(), as an idle engine
should also have an empty fifo.
SMI_SubsequentScreenToScreenCopy() was changed to use WaitIdle()
instead of WaitQueue() before submitting the commands to the engine.
This fixes a nasty lockup when using XaaOffscreenPixmaps (what is
desired/wanted to help improve performance), and the lockup in the
MSOC was clearly due to an engine overrun, when sending commands
faster then the engine could process.
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Instead of cut&paste of the name of the current function everywhere,
just use cpp's __FUNCTION__ predefined macro.
Create two macros to exit a function, named LEAVE() and RETURN().
Functions returning void should call LEAVE() and then explicitly return
for now. "Logged" function calls are indented, so a review was done to
ensure functions with a ENTER() also have the proper exit macro.
The DEBUG macro was changed to have variadic arguments, and this way
it is no longer required to prefix arguments with VERBLEV, but now it
also is not possible to use another "verbosity value", but it wasn't used
in any of the DEBUG macro calls.
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Currently, the support for EXA is not functional, neither is
ShadowFB or bpp/depth other than 16.
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Based on Dennis' code from bug 8721 with some minor
changes by me.
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