drm/radeon/kms: Fix R600 write back buffer

This split write back buffer handling into 3 functions,
wb_fini for cleanup, wb_enable/wb_disable for enabling/disabling
write back used for suspend/resume. This should fix
potential issue of letting the write back active before
suspending. We need to allocate memory in wb_enable because
we can only allocate once GART is running.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 17fff7b..11fa801 100644 (file)
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -1350,32 +1350,47 @@ int r600_ring_test(struct radeon_device *rdev)
        return r;
 }
 
-/*
- * Writeback
- */
-int r600_wb_init(struct radeon_device *rdev)
+void r600_wb_disable(struct radeon_device *rdev)
+{
+       WREG32(SCRATCH_UMSK, 0);
+       if (rdev->wb.wb_obj) {
+               radeon_object_kunmap(rdev->wb.wb_obj);
+               radeon_object_unpin(rdev->wb.wb_obj);
+       }
+}
+
+void r600_wb_fini(struct radeon_device *rdev)
+{
+       r600_wb_disable(rdev);
+       if (rdev->wb.wb_obj) {
+               radeon_object_unref(&rdev->wb.wb_obj);
+               rdev->wb.wb = NULL;
+               rdev->wb.wb_obj = NULL;
+       }
+}
+
+int r600_wb_enable(struct radeon_device *rdev)
 {
        int r;
 
        if (rdev->wb.wb_obj == NULL) {
-               r = radeon_object_create(rdev, NULL, 4096,
-                                        true,
-                                        RADEON_GEM_DOMAIN_GTT,
-                                        false, &rdev->wb.wb_obj);
+               r = radeon_object_create(rdev, NULL, 4096, true,
+                               RADEON_GEM_DOMAIN_GTT, false, &rdev->wb.wb_obj);
                if (r) {
-                       DRM_ERROR("radeon: failed to create WB buffer (%d).\n", r);
+                       dev_warn(rdev->dev, "failed to create WB buffer (%d).\n", r);
                        return r;
                }
-               r = radeon_object_pin(rdev->wb.wb_obj,
-                                     RADEON_GEM_DOMAIN_GTT,
-                                     &rdev->wb.gpu_addr);
+               r = radeon_object_pin(rdev->wb.wb_obj, RADEON_GEM_DOMAIN_GTT,
+                               &rdev->wb.gpu_addr);
                if (r) {
-                       DRM_ERROR("radeon: failed to pin WB buffer (%d).\n", r);
+                       dev_warn(rdev->dev, "failed to pin WB buffer (%d).\n", r);
+                       r600_wb_fini(rdev);
                        return r;
                }
                r = radeon_object_kmap(rdev->wb.wb_obj, (void **)&rdev->wb.wb);
                if (r) {
-                       DRM_ERROR("radeon: failed to map WB buffer (%d).\n", r);
+                       dev_warn(rdev->dev, "failed to map WB buffer (%d).\n", r);
+                       r600_wb_fini(rdev);
                        return r;
                }
        }
@@ -1386,21 +1401,6 @@ int r600_wb_init(struct radeon_device *rdev)
        return 0;
 }
 
-void r600_wb_fini(struct radeon_device *rdev)
-{
-       if (rdev->wb.wb_obj) {
-               radeon_object_kunmap(rdev->wb.wb_obj);
-               radeon_object_unpin(rdev->wb.wb_obj);
-               radeon_object_unref(&rdev->wb.wb_obj);
-               rdev->wb.wb = NULL;
-               rdev->wb.wb_obj = NULL;
-       }
-}
-
-
-/*
- * CS
- */
 void r600_fence_ring_emit(struct radeon_device *rdev,
                          struct radeon_fence *fence)
 {
@@ -1500,9 +1500,8 @@ int r600_startup(struct radeon_device *rdev)
        r = r600_cp_resume(rdev);
        if (r)
                return r;
-       r = r600_wb_init(rdev);
-       if (r)
-               return r;
+       /* write back buffer are not vital so don't worry about failure */
+       r600_wb_enable(rdev);
        return 0;
 }
 
@@ -1539,13 +1538,12 @@ int r600_resume(struct radeon_device *rdev)
        return r;
 }
 
-
 int r600_suspend(struct radeon_device *rdev)
 {
        /* FIXME: we should wait for ring to be empty */
        r600_cp_stop(rdev);
        rdev->cp.ready = false;
-
+       r600_wb_disable(rdev);
        r600_pcie_gart_disable(rdev);
        /* unpin shaders bo */
        radeon_object_unpin(rdev->r600_blit.shader_obj);
@@ -1668,6 +1666,7 @@ void r600_fini(struct radeon_device *rdev)
 
        r600_blit_fini(rdev);
        radeon_ring_fini(rdev);
+       r600_wb_fini(rdev);
        r600_pcie_gart_fini(rdev);
        radeon_gem_fini(rdev);
        radeon_fence_driver_fini(rdev);

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 902791d..8d9dd03 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1082,8 +1082,9 @@ extern int r600_pcie_gart_init(struct radeon_device *rdev);
 extern void r600_pcie_gart_tlb_flush(struct radeon_device *rdev);
 extern int r600_ib_test(struct radeon_device *rdev);
 extern int r600_ring_test(struct radeon_device *rdev);
-extern int r600_wb_init(struct radeon_device *rdev);
 extern void r600_wb_fini(struct radeon_device *rdev);
+extern int r600_wb_enable(struct radeon_device *rdev);
+extern void r600_wb_disable(struct radeon_device *rdev);
 extern void r600_scratch_init(struct radeon_device *rdev);
 extern int r600_blit_init(struct radeon_device *rdev);
 extern void r600_blit_fini(struct radeon_device *rdev);

diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
index 867d04b..af20a8d 100644 (file)
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -884,9 +884,8 @@ static int rv770_startup(struct radeon_device *rdev)
        r = r600_cp_resume(rdev);
        if (r)
                return r;
-       r = r600_wb_init(rdev);
-       if (r)
-               return r;
+       /* write back buffer are not vital so don't worry about failure */
+       r600_wb_enable(rdev);
        return 0;
 }
 
@@ -929,8 +928,8 @@ int rv770_suspend(struct radeon_device *rdev)
        /* FIXME: we should wait for ring to be empty */
        r700_cp_stop(rdev);
        rdev->cp.ready = false;
+       r600_wb_disable(rdev);
        rv770_pcie_gart_disable(rdev);
-
        /* unpin shaders bo */
         radeon_object_unpin(rdev->r600_blit.shader_obj);
        return 0;
@@ -1048,6 +1047,7 @@ void rv770_fini(struct radeon_device *rdev)
 
        r600_blit_fini(rdev);
        radeon_ring_fini(rdev);
+       r600_wb_fini(rdev);
        rv770_pcie_gart_fini(rdev);
        radeon_gem_fini(rdev);
        radeon_fence_driver_fini(rdev);