From 6a9ee8af344e3bd7dbd61e67037096cdf7f83289 Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Mon, 1 Feb 2010 15:38:10 +1000 Subject: 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 --- include/linux/vga_switcheroo.h | 58 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 include/linux/vga_switcheroo.h (limited to 'include/linux/vga_switcheroo.h') diff --git a/include/linux/vga_switcheroo.h b/include/linux/vga_switcheroo.h new file mode 100644 index 0000000..4b58ab1 --- /dev/null +++ b/include/linux/vga_switcheroo.h @@ -0,0 +1,58 @@ +/* + * Copyright (c) 2010 Red Hat Inc. + * Author : Dave Airlie + * + * Licensed under GPLv2 + * + * vga_switcheroo.h - Support for laptop with dual GPU using one set of outputs + */ + +#include +#include + +enum vga_switcheroo_state { + VGA_SWITCHEROO_OFF, + VGA_SWITCHEROO_ON, +}; + +enum vga_switcheroo_client_id { + VGA_SWITCHEROO_IGD, + VGA_SWITCHEROO_DIS, + VGA_SWITCHEROO_MAX_CLIENTS, +}; + +struct vga_switcheroo_handler { + int (*switchto)(enum vga_switcheroo_client_id id); + int (*power_state)(enum vga_switcheroo_client_id id, + enum vga_switcheroo_state state); + int (*init)(void); + int (*get_client_id)(struct pci_dev *pdev); +}; + + +#if defined(CONFIG_VGA_SWITCHEROO) +void vga_switcheroo_unregister_client(struct pci_dev *dev); +int vga_switcheroo_register_client(struct pci_dev *dev, + void (*set_gpu_state)(struct pci_dev *dev, enum vga_switcheroo_state), + bool (*can_switch)(struct pci_dev *dev)); + +void vga_switcheroo_client_fb_set(struct pci_dev *dev, + struct fb_info *info); + +int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler); +void vga_switcheroo_unregister_handler(void); + +int vga_switcheroo_process_delayed_switch(void); + +#else + +static inline void vga_switcheroo_unregister_client(struct pci_dev *dev) {} +static inline int vga_switcheroo_register_client(struct pci_dev *dev, + void (*set_gpu_state)(struct pci_dev *dev, enum vga_switcheroo_state), + bool (*can_switch)(struct pci_dev *dev)) { return 0; } +static inline void vga_switcheroo_client_fb_set(struct pci_dev *dev, struct fb_info *info) {} +static inline int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler) { return 0; } +static inline void vga_switcheroo_unregister_handler(void) {} +static inline int vga_switcheroo_process_delayed_switch(void) { return 0; } + +#endif -- cgit v1.1