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authorAlex Deucher <alexander.deucher@amd.com>2013-02-14 00:47:24 +0400
committerAlex Deucher <alexander.deucher@amd.com>2013-06-28 03:16:23 +0400
commite37e6a0e4fc68cfa9c54410170577de385231de0 (patch)
treed053842f7e11196fdf40bbe22c57a5d19758a9ba /drivers/gpu/drm
parent9d45ad5affddfdf3d1d5d6d5ac28024bd9ee97ee (diff)
downloadlinux-e37e6a0e4fc68cfa9c54410170577de385231de0.tar.xz
drm/radeon: implement apci perf request
These functions use acpi methods to adjust the pcie gen speed. Used by DPM. Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r--drivers/gpu/drm/radeon/radeon.h2
-rw-r--r--drivers/gpu/drm/radeon/radeon_acpi.c162
2 files changed, 143 insertions, 21 deletions
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index d41c3843d3db..f57e36d6fb4a 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -2458,7 +2458,7 @@ extern int radeon_acpi_init(struct radeon_device *rdev);
extern void radeon_acpi_fini(struct radeon_device *rdev);
extern bool radeon_acpi_is_pcie_performance_request_supported(struct radeon_device *rdev);
extern int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,
- u8 ref_req, bool advertise);
+ u8 perf_req, bool advertise);
extern int radeon_acpi_pcie_notify_device_ready(struct radeon_device *rdev);
#else
static inline int radeon_acpi_init(struct radeon_device *rdev) { return 0; }
diff --git a/drivers/gpu/drm/radeon/radeon_acpi.c b/drivers/gpu/drm/radeon/radeon_acpi.c
index 87419a4c25ac..10f98c7742d8 100644
--- a/drivers/gpu/drm/radeon/radeon_acpi.c
+++ b/drivers/gpu/drm/radeon/radeon_acpi.c
@@ -78,28 +78,21 @@ 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;
-
-}
+#define ATCS_VALID_FLAGS_MASK 0x3
-int radeon_acpi_pcie_performance_request(struct radeon_device *rdev,
- u8 ref_req, bool advertise)
-{
- /* XXX: call appropriate ATIF method */
+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;
- return -EINVAL;
-}
+struct atcs_pref_req_output {
+ u16 size; /* structure size in bytes (includes size field) */
+ u8 ret_val; /* return value */
+} __packed;
/* Call the ATIF method
*/
@@ -529,6 +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