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nouveau: Support Optimus models for vga_switcheroo 

Newer nVidia cards with Optimus do not support/use the DSM switching functions.
Instead, it require a DSM function to be called prior to bringing a device into
D3 state. No other _DSM calls are necessary before/after enabling/disabling a
device. Switching between discrete and integrated GPU is not supported by
this Optimus _DSM call, therefore return on the switching method.

Signed-off-by: Peter Lekensteyn <lekensteyn@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Peter Lekensteyn 2011-12-17 12:54:04 +01:00 committed by Dave Airlie
parent 9075e85f46
commit d099230cc3
3 changed files with 42 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
drivers/gpu/drm/nouveau/nouveau_acpi.c
View File

@ -30,6 +30,8 @@
#define NOUVEAU_DSM_POWER_STAMINA 0x02
#define NOUVEAU_DSM_OPTIMUS_FN 0x1A
#define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001
static struct nouveau_dsm_priv {
bool dsm_detected;
bool optimus_detected;
@ -56,7 +58,8 @@ static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *
struct acpi_object_list input;
union acpi_object params[4];
union acpi_object *obj;
int err;
int i, err;
char args_buff[4];
input.count = 4;
input.pointer = params;
@ -68,7 +71,11 @@ static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *
params[2].type = ACPI_TYPE_INTEGER;
params[2].integer.value = func;
params[3].type = ACPI_TYPE_BUFFER;
params[3].buffer.length = 0;
params[3].buffer.length = 4;
/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
for (i = 0; i < 4; i++)
args_buff[i] = (arg >> i * 8) & 0xFF;
params[3].buffer.pointer = args_buff;
err = acpi_evaluate_object(handle, "_DSM", &input, &output);
if (err) {
@ -180,6 +187,10 @@ static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switchero
static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
{
/* perhaps the _DSM functions are mutually exclusive, but prepare for
* the future */
if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
return 0;
if (id == VGA_SWITCHEROO_IGD)
return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
else
@ -192,6 +203,11 @@ static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
if (id == VGA_SWITCHEROO_IGD)
return 0;
/* Optimus laptops have the card already disabled in
* nouveau_switcheroo_set_state */
if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
return 0;
return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
}
@ -278,15 +294,22 @@ static bool nouveau_dsm_detect(void)
}
if (vga_count == 2 && has_dsm && guid_valid) {
acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, &buffer);
acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
&buffer);
printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
acpi_method_name);
acpi_method_name);
nouveau_dsm_priv.dsm_detected = true;
ret = true;
}
if (has_optimus == 1)
if (has_optimus == 1) {
acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
&buffer);
printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
acpi_method_name);
nouveau_dsm_priv.optimus_detected = true;
ret = true;
}
return ret;
}
@ -302,6 +325,17 @@ void nouveau_register_dsm_handler(void)
vga_switcheroo_register_handler(&nouveau_dsm_handler);
}
/* Must be called for Optimus models before the card can be turned off */
void nouveau_switcheroo_optimus_dsm(void)
{
u32 result = 0;
if (!nouveau_dsm_priv.optimus_detected)
return;
nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
NOUVEAU_DSM_OPTIMUS_ARGS, &result);
}
void nouveau_unregister_dsm_handler(void)
{
vga_switcheroo_unregister_handler();

2
drivers/gpu/drm/nouveau/nouveau_drv.h
View File

@ -1055,12 +1055,14 @@ extern int nouveau_dma_wait(struct nouveau_channel *, int slots, int size);
#if defined(CONFIG_ACPI)
void nouveau_register_dsm_handler(void);
void nouveau_unregister_dsm_handler(void);
void nouveau_switcheroo_optimus_dsm(void);
int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len);
bool nouveau_acpi_rom_supported(struct pci_dev *pdev);
int nouveau_acpi_edid(struct drm_device *, struct drm_connector *);
#else
static inline void nouveau_register_dsm_handler(void) {}
static inline void nouveau_unregister_dsm_handler(void) {}
static inline void nouveau_switcheroo_optimus_dsm(void) {}
static inline bool nouveau_acpi_rom_supported(struct pci_dev *pdev) { return false; }
static inline int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) { return -EINVAL; }
static inline int nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) { return -EINVAL; }

1
drivers/gpu/drm/nouveau/nouveau_state.c
View File

@ -525,6 +525,7 @@ static void nouveau_switcheroo_set_state(struct pci_dev *pdev,
printk(KERN_ERR "VGA switcheroo: switched nouveau off\n");
dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
drm_kms_helper_poll_disable(dev);
nouveau_switcheroo_optimus_dsm();
nouveau_pci_suspend(pdev, pmm);
dev->switch_power_state = DRM_SWITCH_POWER_OFF;
}