diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_acpi.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_acpi.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c index 95c740454049..d9f6120e972e 100644 --- a/drivers/gpu/drm/nouveau/nouveau_acpi.c +++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c @@ -51,6 +51,7 @@ static struct nouveau_dsm_priv { bool dsm_detected; bool optimus_detected; acpi_handle dhandle; + acpi_handle other_handle; acpi_handle rom_handle; } nouveau_dsm_priv; @@ -65,6 +66,7 @@ bool nouveau_is_v1_dsm(void) { #define NOUVEAU_DSM_HAS_MUX 0x1 #define NOUVEAU_DSM_HAS_OPT 0x2 +#ifdef CONFIG_VGA_SWITCHEROO static const char nouveau_dsm_muid[] = { 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D, 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4, @@ -260,9 +262,10 @@ static int nouveau_dsm_pci_probe(struct pci_dev *pdev) if (!dhandle) return false; - if (!acpi_has_method(dhandle, "_DSM")) + if (!acpi_has_method(dhandle, "_DSM")) { + nouveau_dsm_priv.other_handle = dhandle; return false; - + } if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER)) retval |= NOUVEAU_DSM_HAS_MUX; @@ -338,6 +341,16 @@ static bool nouveau_dsm_detect(void) printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n", acpi_method_name); nouveau_dsm_priv.dsm_detected = true; + /* + * On some systems hotplug events are generated for the device + * being switched off when _DSM is executed. They cause ACPI + * hotplug to trigger and attempt to remove the device from + * the system, which causes it to break down. Prevent that from + * happening by setting the no_hotplug flag for the involved + * ACPI device objects. + */ + acpi_bus_no_hotplug(nouveau_dsm_priv.dhandle); + acpi_bus_no_hotplug(nouveau_dsm_priv.other_handle); ret = true; } @@ -376,6 +389,11 @@ void nouveau_unregister_dsm_handler(void) if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) vga_switcheroo_unregister_handler(); } +#else +void nouveau_register_dsm_handler(void) {} +void nouveau_unregister_dsm_handler(void) {} +void nouveau_switcheroo_optimus_dsm(void) {} +#endif /* retrieve the ROM in 4k blocks */ static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios, |