CRT blanking needn't be adjusted to perform load detection on 9xx chips, and
the 8xx load detection path now adjusts blanking just during load detection.
Adjusting the blanking interval turned out to cause many monitors to fail to
sync.
If the pipe or output have been set to DPMSOff, then load detection will not
work correctly. Also, share the load detection configuration code between
crt and tv outputs.
Instead of always adding blanking to mode lines, use the FORCE_BORDER option
on i9xx hardware where it works, and dynamically add a bit of border if
necessary on i8xx hardware to make load detection work. This may cause
flashing when a usable crtc is not otherwise idle when load detection is
requested.
The upper bits would have been inappropriately dropped on G33-class hardware,
and on G965-class hardware in a 32-bit environment. The only use of physical
addresses on these should be for FBC, though, and FBC requires addresses
below 4GB. This is unresolved.
- change framebuffer option name to "FramebufferCompression"
- add new "Tiling" option (controls all tiling, not just front buffer)
- add debug message to fb compression enable/disable routines
- update man page with new options
The automatic panel scaling appears to choose bad sampling on some GM965
hardware for 1:1 mapping modes, and there's no real sense in having it on
if we just want 1:1.
Make sure there is some border area to use by changing how the pipe is
configured, then pick a scanline in the middle of the border for load
detection. This lets the load detect code use an active pipe instead of
requiring an idle one.
Just as with i9xx LVDS, the i855 LVDS can operate in dual-channel mode with
a modified P2 divisor value (7 instead of 14). Just using the existing 9xx
code for 855 appears to work fine.
LVDS mode changes how the PLL works in fairly dramatic ways; the debug code
wasn't properly accounting for those differences resulting in fairly bogus
debug output.
The x40 LVDS mode has a 49.6Hz vertical refresh. Waiting for only 20ms can
sometimes cause the driver to start programming the hardware before the
vblank has occurred, which will lock up the i855 chipset. Extend this to
30ms (the maximum timeout used by the BIOS) to ensure this doesn't happen.
Detecting actual vblank occurance using the various status registers should
also be possible but isn't yet working.
The backlight control in the LVDS controller can either operate in 'normal'
mode or 'legacy' mode. In legacy mode, it uses the PCI config space register
0xf4 which can range from 0 to 0xff. In normal mode, it reads the range and
current value from the BLC_PWM_CTL register.
Brice Goglin
Zhenyu Wang
Dave Airlie
Keith Packard
Eric Anholt
Jesse Barnes
Jesse Barnes
Jesse Barnes
Keith Packard
Alan Coopersmith
Carl Worth
Dave Mueller