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path: root/drivers/gpu/drm/radeon/radeon_acpi.c
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Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_acpi.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_acpi.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_acpi.c b/drivers/gpu/drm/radeon/radeon_acpi.c
index 196d28d99570..10f98c7742d8 100644
--- a/drivers/gpu/drm/radeon/radeon_acpi.c
+++ b/drivers/gpu/drm/radeon/radeon_acpi.c
@@ -78,6 +78,22 @@ struct atcs_verify_interface {
u32 function_bits; /* supported functions bit vector */
} __packed;
+#define ATCS_VALID_FLAGS_MASK 0x3
+
+struct atcs_pref_req_input {
+ u16 size; /* structure size in bytes (includes size field) */
+ u16 client_id; /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
+ u16 valid_flags_mask; /* valid flags mask */
+ u16 flags; /* flags */
+ u8 req_type; /* request type */
+ u8 perf_req; /* performance request */
+} __packed;
+
+struct atcs_pref_req_output {
+ u16 size; /* structure size in bytes (includes size field) */
+ u8 ret_val; /* return value */
+} __packed;
+
/* Call the ATIF method
*/
/**
@@ -506,6 +522,135 @@ out:
}
/**
+ * radeon_acpi_is_pcie_performance_request_supported
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
+ * are supported (all asics).
+ * returns true if supported, false if not.
+ */
+bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev)
+{
+ struct radeon_atcs *atcs = &rdev->atcs;
+
+ if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
+ return true;
+
+ return false;
+}
+
+/**
+ * radeon_acpi_pcie_notify_device_ready
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Executes the PCIE_DEVICE_READY_NOTIFICATION method
+ * (all asics).
+ * returns 0 on success, error on failure.
+ */
+int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev)
+{
+ acpi_handle handle;
+ union acpi_object *info;
+ struct radeon_atcs *atcs = &rdev->atcs;
+
+ /* Get the device handle */
+ handle = DEVICE_ACPI_HANDLE(&rdev->pdev->dev);
+ if (!handle)
+ return -EINVAL;
+
+ if (!atcs->functions.pcie_dev_rdy)
+ return -EINVAL;
+
+ info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
+ if (!info)
+ return -EIO;
+
+ kfree(info);
+
+ return 0;
+}
+
+/**
+ * radeon_acpi_pcie_performance_request
+ *
+ * @rdev: radeon_device pointer
+ * @perf_req: requested perf level (pcie gen speed)
+ * @advertise: set advertise caps flag if set
+ *
+ * Executes the PCIE_PERFORMANCE_REQUEST method to
+ * change the pcie gen speed (all asics).
+ * returns 0 on success, error on failure.
+ */
+int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,
+ u8 perf_req, bool advertise)
+{
+ acpi_handle handle;
+ union acpi_object *info;
+ struct radeon_atcs *atcs = &rdev->atcs;
+ struct atcs_pref_req_input atcs_input;
+ struct atcs_pref_req_output atcs_output;
+ struct acpi_buffer params;
+ size_t size;
+ u32 retry = 3;
+
+ /* Get the device handle */
+ handle = DEVICE_ACPI_HANDLE(&rdev->pdev->dev);
+ if (!handle)
+ return -EINVAL;
+
+ if (!atcs->functions.pcie_perf_req)
+ return -EINVAL;
+
+ atcs_input.size = sizeof(struct atcs_pref_req_input);
+ /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
+ atcs_input.client_id = rdev->pdev->devfn | (rdev->pdev->bus->number << 8);
+ atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
+ atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
+ if (advertise)
+ atcs_input.flags |= ATCS_ADVERTISE_CAPS;
+ atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
+ atcs_input.perf_req = perf_req;
+
+ params.length = sizeof(struct atcs_pref_req_input);
+ params.pointer = &atcs_input;
+
+ while (retry--) {
+ info = radeon_atcs_call(handle, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, &params);
+ if (!info)
+ return -EIO;
+
+ memset(&atcs_output, 0, sizeof(atcs_output));
+
+ size = *(u16 *) info->buffer.pointer;
+ if (size < 3) {
+ DRM_INFO("ATCS buffer is too small: %zu\n", size);
+ kfree(info);
+ return -EINVAL;
+ }
+ size = min(sizeof(atcs_output), size);
+
+ memcpy(&atcs_output, info->buffer.pointer, size);
+
+ kfree(info);
+
+ switch (atcs_output.ret_val) {
+ case ATCS_REQUEST_REFUSED:
+ default:
+ return -EINVAL;
+ case ATCS_REQUEST_COMPLETE:
+ return 0;
+ case ATCS_REQUEST_IN_PROGRESS:
+ udelay(10);
+ break;
+ }
+ }
+
+ return 0;
+}
+
+/**
* radeon_acpi_event - handle notify events
*
* @nb: notifier block