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: NJerome Glisse <jglisse@redhat.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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