1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 30844814c25a..173f378428a9 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1227,11 +1227,19 @@ bool radeon_atom_get_clock_info(struct drm_device *dev)
                         rdev->clock.default_dispclk =
                                 le32_to_cpu(firmware_info->info_21.ulDefaultDispEngineClkFreq);
                         if (rdev->clock.default_dispclk == 0) {
-                                if (ASIC_IS_DCE5(rdev))
+                                if (ASIC_IS_DCE6(rdev))
+                                        rdev->clock.default_dispclk = 60000; /* 600 Mhz */
+                                else if (ASIC_IS_DCE5(rdev))
                                         rdev->clock.default_dispclk = 54000; /* 540 Mhz */
                                 else
                                         rdev->clock.default_dispclk = 60000; /* 600 Mhz */
                         }
+                        /* set a reasonable default for DP */
+                        if (ASIC_IS_DCE6(rdev) && (rdev->clock.default_dispclk < 53900)) {
+                                DRM_INFO("Changing default dispclk from %dMhz to 600Mhz\n",
+                                         rdev->clock.default_dispclk / 100);
+                                rdev->clock.default_dispclk = 60000;
+                        }
                         rdev->clock.dp_extclk =
                                 le16_to_cpu(firmware_info->info_21.usUniphyDPModeExtClkFreq);
                         rdev->clock.current_dispclk = rdev->clock.default_dispclk;