diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_acpi.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_acpi.c | 145 |
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, ¶ms); + 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 |