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authorDave Airlie <airlied@linux.ie>2010-02-01 00:38:10 -0500
committerDave Airlie <airlied@redhat.com>2010-03-01 01:20:37 -0500
commit6a9ee8af344e3bd7dbd61e67037096cdf7f83289 (patch)
tree07cdb493a790cf45bc473f2fc2ea1b9a166d5191 /include/linux/vga_switcheroo.h
parent9fd1de52945e06ed88a440c99ca92dab74b9b33c (diff)
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 'include/linux/vga_switcheroo.h')
-rw-r--r--include/linux/vga_switcheroo.h58
1 files changed, 58 insertions, 0 deletions
diff --git a/include/linux/vga_switcheroo.h b/include/linux/vga_switcheroo.h
new file mode 100644
index 000000000000..4b58ab1e8612
--- /dev/null
+++ b/include/linux/vga_switcheroo.h
@@ -0,0 +1,58 @@
1/*
2 * Copyright (c) 2010 Red Hat Inc.
3 * Author : Dave Airlie <airlied@redhat.com>
4 *
5 * Licensed under GPLv2
6 *
7 * vga_switcheroo.h - Support for laptop with dual GPU using one set of outputs
8 */
9
10#include <acpi/acpi.h>
11#include <linux/fb.h>
12
13enum vga_switcheroo_state {
14 VGA_SWITCHEROO_OFF,
15 VGA_SWITCHEROO_ON,
16};
17
18enum vga_switcheroo_client_id {
19 VGA_SWITCHEROO_IGD,
20 VGA_SWITCHEROO_DIS,
21 VGA_SWITCHEROO_MAX_CLIENTS,
22};
23
24struct vga_switcheroo_handler {
25 int (*switchto)(enum vga_switcheroo_client_id id);
26 int (*power_state)(enum vga_switcheroo_client_id id,
27 enum vga_switcheroo_state state);
28 int (*init)(void);
29 int (*get_client_id)(struct pci_dev *pdev);
30};
31
32
33#if defined(CONFIG_VGA_SWITCHEROO)
34void vga_switcheroo_unregister_client(struct pci_dev *dev);
35int vga_switcheroo_register_client(struct pci_dev *dev,
36 void (*set_gpu_state)(struct pci_dev *dev, enum vga_switcheroo_state),
37 bool (*can_switch)(struct pci_dev *dev));
38
39void vga_switcheroo_client_fb_set(struct pci_dev *dev,
40 struct fb_info *info);
41
42int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler);
43void vga_switcheroo_unregister_handler(void);
44
45int vga_switcheroo_process_delayed_switch(void);
46
47#else
48
49static inline void vga_switcheroo_unregister_client(struct pci_dev *dev) {}
50static inline int vga_switcheroo_register_client(struct pci_dev *dev,
51 void (*set_gpu_state)(struct pci_dev *dev, enum vga_switcheroo_state),
52 bool (*can_switch)(struct pci_dev *dev)) { return 0; }
53static inline void vga_switcheroo_client_fb_set(struct pci_dev *dev, struct fb_info *info) {}
54static inline int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler) { return 0; }
55static inline void vga_switcheroo_unregister_handler(void) {}
56static inline int vga_switcheroo_process_delayed_switch(void) { return 0; }
57
58#endif