drm/radeon/kms: fix calculation of h/v scaling factors
Prior to this patch the code was dividing the src_v by the dst_h and vice versa, rather than src_v/dst_v and src_h/dst_h. This could lead to problems in the calculation of the display watermarks. Signed-off-by: NAlex Deucher <alexdeucher@gmail.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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