drm/radeon: add query to fetch the max engine clock (v2)

This is needed for reporting the max GPU engine clock
in OpenCL.  This just reports the max possible engine
clock, it does not take into account current conditions
that may limit that clock.

v2: fix query number for merge with 3.13

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

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 5bf50cec017e..9e3af24e1b05 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -470,6 +470,13 @@ static int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file
                         DRM_DEBUG_KMS("BACKEND_ENABLED_MASK is si+ only!\n");
                 }
                 break;
+        case RADEON_INFO_MAX_SCLK:
+                if ((rdev->pm.pm_method == PM_METHOD_DPM) &&
+                    rdev->pm.dpm_enabled)
+                        *value = rdev->pm.dpm.dyn_state.max_clock_voltage_on_ac.sclk * 10;
+                else
+                        *value = rdev->pm.default_sclk * 10;
+                break;
         default:
                 DRM_DEBUG_KMS("Invalid request %d\n", info->request);
                 return -EINVAL;