drm/radeon/kms: add dpm support for evergreen (v4)

This adds dpm support for evergreen asics.  This includes:
- clockgating
- dynamic engine clock scaling
- dynamic memory clock scaling
- dynamic voltage scaling
- dynamic pcie gen1/gen2 switching (requires additional acpi support)

Set radeon.dpm=1 to enable.

v2: reduce stack usage, rename ulv struct
v3: fix thermal interrupt check notices by Jerome
v4: fix state enable

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_acpi.c b/drivers/gpu/drm/radeon/radeon_acpi.c
index 196d28d99570..87419a4c25ac 100644
--- a/drivers/gpu/drm/radeon/radeon_acpi.c
+++ b/drivers/gpu/drm/radeon/radeon_acpi.c
@@ -78,6 +78,29 @@ struct atcs_verify_interface {
 	u32 function_bits;	/* supported functions bit vector */
 } __packed;
 
+bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev)
+{
+	/* XXX: query ATIF */
+
+	return false;
+}
+
+int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev)
+{
+	/* XXX: call appropriate ATIF method */
+
+	return -EINVAL;
+
+}
+
+int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,
+					 u8 ref_req, bool advertise)
+{
+	/* XXX: call appropriate ATIF method */
+
+	return -EINVAL;
+}
+
 /* Call the ATIF method
  */
 /**