drm/radeon/kms/evergreen: fix backend setup

This patch fixes rendering errors on some evergreen boards.
Hardcoding the backend map is not an optimal solution, but
a better fix is being worked on.

Similar to the fix for rv740
(6271901d828b34b27607314026deaf417f9f9b75).

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=29986

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index b8b7f010b25f8df49e20329932c1735482c03ecf..79082d4398ae156378609bbbbb4e8a9c900124cc 100644 (file)
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -1160,14 +1160,25 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
                                                                        EVERGREEN_MAX_BACKENDS_MASK));
                        break;
                }
-       } else
-               gb_backend_map =
-                       evergreen_get_tile_pipe_to_backend_map(rdev,
-                                                              rdev->config.evergreen.max_tile_pipes,
-                                                              rdev->config.evergreen.max_backends,
-                                                              ((EVERGREEN_MAX_BACKENDS_MASK <<
-                                                                rdev->config.evergreen.max_backends) &
-                                                               EVERGREEN_MAX_BACKENDS_MASK));
+       } else {
+               switch (rdev->family) {
+               case CHIP_CYPRESS:
+               case CHIP_HEMLOCK:
+                       gb_backend_map = 0x66442200;
+                       break;
+               case CHIP_JUNIPER:
+                       gb_backend_map = 0x00006420;
+                       break;
+               default:
+                       gb_backend_map =
+                               evergreen_get_tile_pipe_to_backend_map(rdev,
+                                                                      rdev->config.evergreen.max_tile_pipes,
+                                                                      rdev->config.evergreen.max_backends,
+                                                                      ((EVERGREEN_MAX_BACKENDS_MASK <<
+                                                                        rdev->config.evergreen.max_backends) &
+                                                                       EVERGREEN_MAX_BACKENDS_MASK));
+               }
+       }
 
        rdev->config.evergreen.tile_config = gb_addr_config;
        WREG32(GB_BACKEND_MAP, gb_backend_map);