drm/radeon/kms: bail on BTC parts if MC ucode is missing

commit 77e00f2ea94abee1ad13bdfde19cf7aa25992b0e upstream.

We already do this for cayman, need to also do it for
BTC parts.  The default memory and voltage setup is not
adequate for advanced operation.  Continuing will
result in an unusable display.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 21c5aa070b959ee0f8a5d69a706dd6e204aa5e26..fe052c618aec85be55da474d88fb2e075e0b3106 100644 (file)
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -3257,6 +3257,18 @@ int evergreen_init(struct radeon_device *rdev)
                        rdev->accel_working = false;
                }
        }
+
+       /* Don't start up if the MC ucode is missing on BTC parts.
+        * The default clocks and voltages before the MC ucode
+        * is loaded are not suffient for advanced operations.
+        */
+       if (ASIC_IS_DCE5(rdev)) {
+               if (!rdev->mc_fw && !(rdev->flags & RADEON_IS_IGP)) {
+                       DRM_ERROR("radeon: MC ucode required for NI+.\n");
+                       return -EINVAL;
+               }
+       }
+
        return 0;
 }