drm/radeon/kms/evergreen: reset the grbm blocks at resume and init

This fixes module reloading and resume as the gfx block seems to
be left in a bad state in some cases.

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 6ced1ba2bee85e68d32251dc6a9200af58b2bbc6..7b337c361a1240f12afc0105bc55d0867172b151 100644 (file)
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -2583,6 +2583,11 @@ int evergreen_resume(struct radeon_device *rdev)
 {
        int r;
 
+       /* reset the asic, the gfx blocks are often in a bad state
+        * after the driver is unloaded or after a resume
+        */
+       if (radeon_asic_reset(rdev))
+               dev_warn(rdev->dev, "GPU reset failed !\n");
        /* Do not reset GPU before posting, on rv770 hw unlike on r500 hw,
         * posting will perform necessary task to bring back GPU into good
         * shape.
@@ -2699,6 +2704,11 @@ int evergreen_init(struct radeon_device *rdev)
        r = radeon_atombios_init(rdev);
        if (r)
                return r;
+       /* reset the asic, the gfx blocks are often in a bad state
+        * after the driver is unloaded or after a resume
+        */
+       if (radeon_asic_reset(rdev))
+               dev_warn(rdev->dev, "GPU reset failed !\n");
        /* Post card if necessary */
        if (!evergreen_card_posted(rdev)) {
                if (!rdev->bios) {