diff options
Diffstat (limited to 'include/linux/vgaarb.h')
| -rw-r--r-- | include/linux/vgaarb.h | 49 |
1 files changed, 27 insertions, 22 deletions
diff --git a/include/linux/vgaarb.h b/include/linux/vgaarb.h index 68229ce80fde..e81c64af80c1 100644 --- a/include/linux/vgaarb.h +++ b/include/linux/vgaarb.h @@ -46,9 +46,9 @@ extern void vga_set_legacy_decoding(struct pci_dev *pdev, /** * vga_get - acquire & locks VGA resources * - * pdev: pci device of the VGA card or NULL for the system default - * rsrc: bit mask of resources to acquire and lock - * interruptible: blocking should be interruptible by signals ? + * @pdev: pci device of the VGA card or NULL for the system default + * @rsrc: bit mask of resources to acquire and lock + * @interruptible: blocking should be interruptible by signals ? * * This function acquires VGA resources for the given * card and mark those resources locked. If the resource requested @@ -81,19 +81,19 @@ extern int vga_get(struct pci_dev *pdev, unsigned int rsrc, */ static inline int vga_get_interruptible(struct pci_dev *pdev, - unsigned int rsrc) + unsigned int rsrc) { return vga_get(pdev, rsrc, 1); } /** - * vga_get_interruptible + * vga_get_uninterruptible * * Shortcut to vga_get */ static inline int vga_get_uninterruptible(struct pci_dev *pdev, - unsigned int rsrc) + unsigned int rsrc) { return vga_get(pdev, rsrc, 0); } @@ -165,28 +165,33 @@ static inline int vga_conflicts(struct pci_dev *p1, struct pci_dev *p2) } #endif -/* - * Register a client with the VGA arbitration logic - * return value: number of VGA devices in system. - * - * Clients have two callback mechanisms they can use. - * irq enable/disable callback - - * If a client can't disable its GPUs VGA resources, then we - * need to be able to ask it to turn off its irqs when we - * turn off its mem and io decoding. - * set_vga_decode - * If a client can disable its GPU VGA resource, it will - * get a callback from this to set the encode/decode state - * - * Clients with disable abilities should check the return value - * of this function and if the VGA device count is > 1, should - * disable VGA decoding resources. +/** + * vga_client_register + * + * @pdev: pci device of the VGA client + * @cookie: client cookie to be used in callbacks + * @irq_set_state: irq state change callback + * @set_vga_decode: vga decode change callback + * + * return value: 0 on success, -1 on failure + * Register a client with the VGA arbitration logic + * + * Clients have two callback mechanisms they can use. + * irq enable/disable callback - + * If a client can't disable its GPUs VGA resources, then we + * need to be able to ask it to turn off its irqs when we + * turn off its mem and io decoding. + * set_vga_decode + * If a client can disable its GPU VGA resource, it will + * get a callback from this to set the encode/decode state * * Rationale: we cannot disable VGA decode resources unconditionally * some single GPU laptops seem to require ACPI or BIOS access to the * VGA registers to control things like backlights etc. * Hopefully newer multi-GPU laptops do something saner, and desktops * won't have any special ACPI for this. + * They driver will get a callback when VGA arbitration is first used + * by userspace since we some older X servers have issues. */ int vga_client_register(struct pci_dev *pdev, void *cookie, void (*irq_set_state)(void *cookie, bool state), |