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| author |   Dave Airlie <airlied@linux.ie> | 2010-02-01 15:38:10 +1000 |
|---|---|---|
| committer |   Dave Airlie <airlied@redhat.com> | 2010-03-01 16:20:37 +1000 |
| commit | 6a9ee8af344e3bd7dbd61e67037096cdf7f83289 (patch) | |
| tree | 07cdb493a790cf45bc473f2fc2ea1b9a166d5191 /drivers/gpu/vga/Kconfig | |
| parent | fb: for framebuffer handover don't exit the loop early. (diff) | |
| download | linux-dev-6a9ee8af344e3bd7dbd61e67037096cdf7f83289.tar.xz linux-dev-6a9ee8af344e3bd7dbd61e67037096cdf7f83289.zip | |
vga_switcheroo: initial implementation (v15)
Many new laptops now come with 2 gpus, one to be used for low power
modes and one for gaming/on-ac applications. These GPUs are typically
wired to the laptop panel and VGA ports via a multiplexer unit which
is controlled via ACPI methods.
4 combinations of systems typically exist - with 2 ACPI methods.
Intel/ATI - Lenovo W500/T500 - use ATPX ACPI method
ATI/ATI - some ASUS - use ATPX ACPI Method
Intel/Nvidia - - use _DSM ACPI method
Nvidia/Nvidia - - use _DSM ACPI method.
TODO:
This patch adds support for the ATPX method and initial bits
for the _DSM methods that need to written by someone with
access to the hardware.
Add a proper non-debugfs interface - need to get some proper
testing first.
v2: add power up/down support for both devices
on W500 puts i915/radeon into D3 and cuts power to radeon.
v3: redo probing methods, no DMI list, drm devices call to
register with switcheroo, it tries to find an ATPX method on
any device and once there is two devices + ATPX it inits the
switcher.
v4: ATPX msg handling using buffers - should work on more machines
v5: rearchitect after more mjg59 discussion - move ATPX handling to
radeon driver.
v6: add file headers + initial nouveau bits (to be filled out).
v7: merge delayed switcher code.
v8: avoid suspend/resume of gpu that is off
v9: rearchitect - mjg59 is always right. - move all ATPX code to
radeon, should allow simpler DSM also proper ATRM handling
v10: add ATRM support for radeon BIOS, add mutex to lock vgasr_priv
v11: fix bug in resuming Intel for 2nd time.
v12: start fixing up nvidia code blindly.
v13: blindly guess at finishing nvidia code
v14: remove radeon audio hacks - fix up intel resume more like upstream
v15: clean up printks + remove unnecessary igd/dis pointers
mount debugfs
/sys/kernel/debug/vgaswitcheroo/switch - should exist if ATPX detected
+ 2 cards.
DIS - immediate change to discrete
IGD - immediate change to IGD
DDIS - delayed change to discrete
DIGD - delayed change to IGD
ON - turn on not in use
OFF - turn off not in use
Tested on W500 (Intel/ATI) and T500 (Intel/ATI)
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/vga/Kconfig')
| -rw-r--r-- | drivers/gpu/vga/Kconfig | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/vga/Kconfig b/drivers/gpu/vga/Kconfig index 790e675b13eb..6116a0196214 100644 --- a/drivers/gpu/vga/Kconfig +++ b/drivers/gpu/vga/Kconfig @@ -8,3 +8,16 @@ config VGA_ARB are accessed at same time they need some kind of coordination. Please see Documentation/vgaarbiter.txt for more details. Select this to enable VGA arbiter. + +config VGA_SWITCHEROO + bool "Laptop Hybrid Grapics - GPU switching support" + default y + depends on X86 + depends on ACPI + help + Many laptops released in 2008/9/10 have two gpus with a multiplxer + to switch between them. This adds support for dynamic switching when + X isn't running and delayed switching until the next logoff. This + features is called hybrid graphics, ATI PowerXpress, and Nvidia + HybridPower. + |