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>
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
index 48227e7..0e0730a 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -11,6 +11,8 @@
#include "nouveau_drm.h"
#include "nv50_display.h"
+#include <linux/vga_switcheroo.h>
+
#define NOUVEAU_DSM_SUPPORTED 0x00
#define NOUVEAU_DSM_SUPPORTED_FUNCTIONS 0x00
@@ -28,31 +30,30 @@
#define NOUVEAU_DSM_POWER_SPEED 0x01
#define NOUVEAU_DSM_POWER_STAMINA 0x02
-static int nouveau_dsm(struct drm_device *dev, int func, int arg, int *result)
-{
- static char muid[] = {
- 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
- 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
- };
+static struct nouveau_dsm_priv {
+ bool dsm_detected;
+ acpi_handle dhandle;
+ acpi_handle dsm_handle;
+} nouveau_dsm_priv;
- struct pci_dev *pdev = dev->pdev;
- struct acpi_handle *handle;
+static const char nouveau_dsm_muid[] = {
+ 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
+ 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
+};
+
+static int nouveau_dsm(acpi_handle handle, int func, int arg, int *result)
+{
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_object_list input;
union acpi_object params[4];
union acpi_object *obj;
int err;
- handle = DEVICE_ACPI_HANDLE(&pdev->dev);
-
- if (!handle)
- return -ENODEV;
-
input.count = 4;
input.pointer = params;
params[0].type = ACPI_TYPE_BUFFER;
- params[0].buffer.length = sizeof(muid);
- params[0].buffer.pointer = (char *)muid;
+ params[0].buffer.length = sizeof(nouveau_dsm_muid);
+ params[0].buffer.pointer = (char *)nouveau_dsm_muid;
params[1].type = ACPI_TYPE_INTEGER;
params[1].integer.value = 0x00000102;
params[2].type = ACPI_TYPE_INTEGER;
@@ -62,7 +63,7 @@
err = acpi_evaluate_object(handle, "_DSM", &input, &output);
if (err) {
- NV_INFO(dev, "failed to evaluate _DSM: %d\n", err);
+ printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
return err;
}
@@ -86,40 +87,119 @@
return 0;
}
-int nouveau_hybrid_setup(struct drm_device *dev)
+static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
{
- int result;
+ return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
+}
- if (nouveau_dsm(dev, NOUVEAU_DSM_POWER, NOUVEAU_DSM_POWER_STATE,
- &result))
- return -ENODEV;
-
- NV_INFO(dev, "_DSM hardware status gave 0x%x\n", result);
-
- if (result) { /* Ensure that the external GPU is enabled */
- nouveau_dsm(dev, NOUVEAU_DSM_LED, NOUVEAU_DSM_LED_SPEED, NULL);
- nouveau_dsm(dev, NOUVEAU_DSM_POWER, NOUVEAU_DSM_POWER_SPEED,
- NULL);
- } else { /* Stamina mode - disable the external GPU */
- nouveau_dsm(dev, NOUVEAU_DSM_LED, NOUVEAU_DSM_LED_STAMINA,
- NULL);
- nouveau_dsm(dev, NOUVEAU_DSM_POWER, NOUVEAU_DSM_POWER_STAMINA,
- NULL);
- }
-
+static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
+{
+ int arg;
+ if (state == VGA_SWITCHEROO_ON)
+ arg = NOUVEAU_DSM_POWER_SPEED;
+ else
+ arg = NOUVEAU_DSM_POWER_STAMINA;
+ nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
return 0;
}
-bool nouveau_dsm_probe(struct drm_device *dev)
+static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
{
- int support = 0;
+ if (id == VGA_SWITCHEROO_IGD)
+ return nouveau_dsm_switch_mux(nouveau_dsm_priv.dsm_handle, NOUVEAU_DSM_LED_STAMINA);
+ else
+ return nouveau_dsm_switch_mux(nouveau_dsm_priv.dsm_handle, NOUVEAU_DSM_LED_SPEED);
+}
- if (nouveau_dsm(dev, NOUVEAU_DSM_SUPPORTED,
- NOUVEAU_DSM_SUPPORTED_FUNCTIONS, &support))
+static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
+ enum vga_switcheroo_state state)
+{
+ if (id == VGA_SWITCHEROO_IGD)
+ return 0;
+
+ return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dsm_handle, state);
+}
+
+static int nouveau_dsm_init(void)
+{
+ return 0;
+}
+
+static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
+{
+ if (nouveau_dsm_priv.dhandle == DEVICE_ACPI_HANDLE(&pdev->dev))
+ return VGA_SWITCHEROO_IGD;
+ else
+ return VGA_SWITCHEROO_DIS;
+}
+
+static struct vga_switcheroo_handler nouveau_dsm_handler = {
+ .switchto = nouveau_dsm_switchto,
+ .power_state = nouveau_dsm_power_state,
+ .init = nouveau_dsm_init,
+ .get_client_id = nouveau_dsm_get_client_id,
+};
+
+static bool nouveau_dsm_pci_probe(struct pci_dev *pdev)
+{
+ acpi_handle dhandle, nvidia_handle;
+ acpi_status status;
+ int ret;
+ uint32_t result;
+
+ dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
+ if (!dhandle)
+ return false;
+ status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
+ if (ACPI_FAILURE(status)) {
+ return false;
+ }
+
+ ret= nouveau_dsm(nvidia_handle, NOUVEAU_DSM_SUPPORTED,
+ NOUVEAU_DSM_SUPPORTED_FUNCTIONS, &result);
+ if (ret < 0)
return false;
- if (!support)
- return false;
-
+ nouveau_dsm_priv.dhandle = dhandle;
+ nouveau_dsm_priv.dsm_handle = nvidia_handle;
return true;
}
+
+static bool nouveau_dsm_detect(void)
+{
+ char acpi_method_name[255] = { 0 };
+ struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
+ struct pci_dev *pdev = NULL;
+ int has_dsm = 0;
+ int vga_count = 0;
+ while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
+ vga_count++;
+
+ has_dsm |= (nouveau_dsm_pci_probe(pdev) == true);
+ }
+
+ if (vga_count == 2 && has_dsm) {
+ acpi_get_name(nouveau_dsm_priv.dsm_handle, ACPI_FULL_PATHNAME, &buffer);
+ printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
+ acpi_method_name);
+ nouveau_dsm_priv.dsm_detected = true;
+ return true;
+ }
+ return false;
+}
+
+void nouveau_register_dsm_handler(void)
+{
+ bool r;
+
+ r = nouveau_dsm_detect();
+ if (!r)
+ return;
+
+ vga_switcheroo_register_handler(&nouveau_dsm_handler);
+}
+
+void nouveau_unregister_dsm_handler(void)
+{
+ vga_switcheroo_unregister_handler();
+}